| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _LINUX_MM_H |
| #define _LINUX_MM_H |
| |
| #include <linux/errno.h> |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/mmdebug.h> |
| #include <linux/gfp.h> |
| #include <linux/bug.h> |
| #include <linux/list.h> |
| #include <linux/mmzone.h> |
| #include <linux/rbtree.h> |
| #include <linux/atomic.h> |
| #include <linux/debug_locks.h> |
| #include <linux/mm_types.h> |
| #include <linux/mmap_lock.h> |
| #include <linux/range.h> |
| #include <linux/pfn.h> |
| #include <linux/percpu-refcount.h> |
| #include <linux/bit_spinlock.h> |
| #include <linux/shrinker.h> |
| #include <linux/resource.h> |
| #include <linux/page_ext.h> |
| #include <linux/err.h> |
| #include <linux/page-flags.h> |
| #include <linux/page_ref.h> |
| #include <linux/memremap.h> |
| #include <linux/overflow.h> |
| #include <linux/sizes.h> |
| #include <linux/sched.h> |
| #include <linux/pgtable.h> |
| #include <linux/kasan.h> |
| |
| struct mempolicy; |
| struct anon_vma; |
| struct anon_vma_chain; |
| struct file_ra_state; |
| struct user_struct; |
| struct writeback_control; |
| struct bdi_writeback; |
| struct pt_regs; |
| |
| extern int sysctl_page_lock_unfairness; |
| |
| void init_mm_internals(void); |
| |
| #ifndef CONFIG_NEED_MULTIPLE_NODES /* Don't use mapnrs, do it properly */ |
| extern unsigned long max_mapnr; |
| |
| static inline void set_max_mapnr(unsigned long limit) |
| { |
| max_mapnr = limit; |
| } |
| #else |
| static inline void set_max_mapnr(unsigned long limit) { } |
| #endif |
| |
| extern atomic_long_t _totalram_pages; |
| static inline unsigned long totalram_pages(void) |
| { |
| return (unsigned long)atomic_long_read(&_totalram_pages); |
| } |
| |
| static inline void totalram_pages_inc(void) |
| { |
| atomic_long_inc(&_totalram_pages); |
| } |
| |
| static inline void totalram_pages_dec(void) |
| { |
| atomic_long_dec(&_totalram_pages); |
| } |
| |
| static inline void totalram_pages_add(long count) |
| { |
| atomic_long_add(count, &_totalram_pages); |
| } |
| |
| extern void * high_memory; |
| extern int page_cluster; |
| |
| #ifdef CONFIG_SYSCTL |
| extern int sysctl_legacy_va_layout; |
| #else |
| #define sysctl_legacy_va_layout 0 |
| #endif |
| |
| #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
| extern const int mmap_rnd_bits_min; |
| extern const int mmap_rnd_bits_max; |
| extern int mmap_rnd_bits __read_mostly; |
| #endif |
| #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS |
| extern const int mmap_rnd_compat_bits_min; |
| extern const int mmap_rnd_compat_bits_max; |
| extern int mmap_rnd_compat_bits __read_mostly; |
| #endif |
| |
| #include <asm/page.h> |
| #include <asm/processor.h> |
| |
| /* |
| * Architectures that support memory tagging (assigning tags to memory regions, |
| * embedding these tags into addresses that point to these memory regions, and |
| * checking that the memory and the pointer tags match on memory accesses) |
| * redefine this macro to strip tags from pointers. |
| * It's defined as noop for arcitectures that don't support memory tagging. |
| */ |
| #ifndef untagged_addr |
| #define untagged_addr(addr) (addr) |
| #endif |
| |
| #ifndef __pa_symbol |
| #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) |
| #endif |
| |
| #ifndef page_to_virt |
| #define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) |
| #endif |
| |
| #ifndef lm_alias |
| #define lm_alias(x) __va(__pa_symbol(x)) |
| #endif |
| |
| /* |
| * To prevent common memory management code establishing |
| * a zero page mapping on a read fault. |
| * This macro should be defined within <asm/pgtable.h>. |
| * s390 does this to prevent multiplexing of hardware bits |
| * related to the physical page in case of virtualization. |
| */ |
| #ifndef mm_forbids_zeropage |
| #define mm_forbids_zeropage(X) (0) |
| #endif |
| |
| /* |
| * On some architectures it is expensive to call memset() for small sizes. |
| * If an architecture decides to implement their own version of |
| * mm_zero_struct_page they should wrap the defines below in a #ifndef and |
| * define their own version of this macro in <asm/pgtable.h> |
| */ |
| #if BITS_PER_LONG == 64 |
| /* This function must be updated when the size of struct page grows above 80 |
| * or reduces below 56. The idea that compiler optimizes out switch() |
| * statement, and only leaves move/store instructions. Also the compiler can |
| * combine write statments if they are both assignments and can be reordered, |
| * this can result in several of the writes here being dropped. |
| */ |
| #define mm_zero_struct_page(pp) __mm_zero_struct_page(pp) |
| static inline void __mm_zero_struct_page(struct page *page) |
| { |
| unsigned long *_pp = (void *)page; |
| |
| /* Check that struct page is either 56, 64, 72, or 80 bytes */ |
| BUILD_BUG_ON(sizeof(struct page) & 7); |
| BUILD_BUG_ON(sizeof(struct page) < 56); |
| BUILD_BUG_ON(sizeof(struct page) > 80); |
| |
| switch (sizeof(struct page)) { |
| case 80: |
| _pp[9] = 0; |
| fallthrough; |
| case 72: |
| _pp[8] = 0; |
| fallthrough; |
| case 64: |
| _pp[7] = 0; |
| fallthrough; |
| case 56: |
| _pp[6] = 0; |
| _pp[5] = 0; |
| _pp[4] = 0; |
| _pp[3] = 0; |
| _pp[2] = 0; |
| _pp[1] = 0; |
| _pp[0] = 0; |
| } |
| } |
| #else |
| #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) |
| #endif |
| |
| /* |
| * Default maximum number of active map areas, this limits the number of vmas |
| * per mm struct. Users can overwrite this number by sysctl but there is a |
| * problem. |
| * |
| * When a program's coredump is generated as ELF format, a section is created |
| * per a vma. In ELF, the number of sections is represented in unsigned short. |
| * This means the number of sections should be smaller than 65535 at coredump. |
| * Because the kernel adds some informative sections to a image of program at |
| * generating coredump, we need some margin. The number of extra sections is |
| * 1-3 now and depends on arch. We use "5" as safe margin, here. |
| * |
| * ELF extended numbering allows more than 65535 sections, so 16-bit bound is |
| * not a hard limit any more. Although some userspace tools can be surprised by |
| * that. |
| */ |
| #define MAPCOUNT_ELF_CORE_MARGIN (5) |
| #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
| |
| extern int sysctl_max_map_count; |
| |
| extern unsigned long sysctl_user_reserve_kbytes; |
| extern unsigned long sysctl_admin_reserve_kbytes; |
| |
| extern int sysctl_overcommit_memory; |
| extern int sysctl_overcommit_ratio; |
| extern unsigned long sysctl_overcommit_kbytes; |
| |
| int overcommit_ratio_handler(struct ctl_table *, int, void *, size_t *, |
| loff_t *); |
| int overcommit_kbytes_handler(struct ctl_table *, int, void *, size_t *, |
| loff_t *); |
| int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, |
| loff_t *); |
| /* |
| * Any attempt to mark this function as static leads to build failure |
| * when CONFIG_DEBUG_INFO_BTF is enabled because __add_to_page_cache_locked() |
| * is referred to by BPF code. This must be visible for error injection. |
| */ |
| int __add_to_page_cache_locked(struct page *page, struct address_space *mapping, |
| pgoff_t index, gfp_t gfp, void **shadowp); |
| |
| #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) |
| |
| /* to align the pointer to the (next) page boundary */ |
| #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) |
| |
| /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */ |
| #define PAGE_ALIGNED(addr) IS_ALIGNED((unsigned long)(addr), PAGE_SIZE) |
| |
| #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) |
| |
| /* |
| * Linux kernel virtual memory manager primitives. |
| * The idea being to have a "virtual" mm in the same way |
| * we have a virtual fs - giving a cleaner interface to the |
| * mm details, and allowing different kinds of memory mappings |
| * (from shared memory to executable loading to arbitrary |
| * mmap() functions). |
| */ |
| |
| struct vm_area_struct *vm_area_alloc(struct mm_struct *); |
| struct vm_area_struct *vm_area_dup(struct vm_area_struct *); |
| void vm_area_free(struct vm_area_struct *); |
| |
| #ifndef CONFIG_MMU |
| extern struct rb_root nommu_region_tree; |
| extern struct rw_semaphore nommu_region_sem; |
| |
| extern unsigned int kobjsize(const void *objp); |
| #endif |
| |
| /* |
| * vm_flags in vm_area_struct, see mm_types.h. |
| * When changing, update also include/trace/events/mmflags.h |
| */ |
| #define VM_NONE 0x00000000 |
| |
| #define VM_READ 0x00000001 /* currently active flags */ |
| #define VM_WRITE 0x00000002 |
| #define VM_EXEC 0x00000004 |
| #define VM_SHARED 0x00000008 |
| |
| /* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ |
| #define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ |
| #define VM_MAYWRITE 0x00000020 |
| #define VM_MAYEXEC 0x00000040 |
| #define VM_MAYSHARE 0x00000080 |
| |
| #define VM_GROWSDOWN 0x00000100 /* general info on the segment */ |
| #define VM_UFFD_MISSING 0x00000200 /* missing pages tracking */ |
| #define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ |
| #define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ |
| #define VM_UFFD_WP 0x00001000 /* wrprotect pages tracking */ |
| |
| #define VM_LOCKED 0x00002000 |
| #define VM_IO 0x00004000 /* Memory mapped I/O or similar */ |
| |
| /* Used by sys_madvise() */ |
| #define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ |
| #define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ |
| |
| #define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ |
| #define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ |
| #define VM_LOCKONFAULT 0x00080000 /* Lock the pages covered when they are faulted in */ |
| #define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ |
| #define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ |
| #define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ |
| #define VM_SYNC 0x00800000 /* Synchronous page faults */ |
| #define VM_ARCH_1 0x01000000 /* Architecture-specific flag */ |
| #define VM_WIPEONFORK 0x02000000 /* Wipe VMA contents in child. */ |
| #define VM_DONTDUMP 0x04000000 /* Do not include in the core dump */ |
| |
| #ifdef CONFIG_MEM_SOFT_DIRTY |
| # define VM_SOFTDIRTY 0x08000000 /* Not soft dirty clean area */ |
| #else |
| # define VM_SOFTDIRTY 0 |
| #endif |
| |
| #define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ |
| #define VM_HUGEPAGE 0x20000000 /* MADV_HUGEPAGE marked this vma */ |
| #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ |
| #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ |
| |
| #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS |
| #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ |
| #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ |
| #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ |
| #define VM_HIGH_ARCH_BIT_3 35 /* bit only usable on 64-bit architectures */ |
| #define VM_HIGH_ARCH_BIT_4 36 /* bit only usable on 64-bit architectures */ |
| #define VM_HIGH_ARCH_0 BIT(VM_HIGH_ARCH_BIT_0) |
| #define VM_HIGH_ARCH_1 BIT(VM_HIGH_ARCH_BIT_1) |
| #define VM_HIGH_ARCH_2 BIT(VM_HIGH_ARCH_BIT_2) |
| #define VM_HIGH_ARCH_3 BIT(VM_HIGH_ARCH_BIT_3) |
| #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) |
| #endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ |
| |
| #ifdef CONFIG_ARCH_HAS_PKEYS |
| # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 |
| # define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ |
| # define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ |
| # define VM_PKEY_BIT2 VM_HIGH_ARCH_2 |
| # define VM_PKEY_BIT3 VM_HIGH_ARCH_3 |
| #ifdef CONFIG_PPC |
| # define VM_PKEY_BIT4 VM_HIGH_ARCH_4 |
| #else |
| # define VM_PKEY_BIT4 0 |
| #endif |
| #endif /* CONFIG_ARCH_HAS_PKEYS */ |
| |
| #if defined(CONFIG_X86) |
| # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ |
| #elif defined(CONFIG_PPC) |
| # define VM_SAO VM_ARCH_1 /* Strong Access Ordering (powerpc) */ |
| #elif defined(CONFIG_PARISC) |
| # define VM_GROWSUP VM_ARCH_1 |
| #elif defined(CONFIG_IA64) |
| # define VM_GROWSUP VM_ARCH_1 |
| #elif defined(CONFIG_SPARC64) |
| # define VM_SPARC_ADI VM_ARCH_1 /* Uses ADI tag for access control */ |
| # define VM_ARCH_CLEAR VM_SPARC_ADI |
| #elif defined(CONFIG_ARM64) |
| # define VM_ARM64_BTI VM_ARCH_1 /* BTI guarded page, a.k.a. GP bit */ |
| # define VM_ARCH_CLEAR VM_ARM64_BTI |
| #elif !defined(CONFIG_MMU) |
| # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ |
| #endif |
| |
| #if defined(CONFIG_ARM64_MTE) |
| # define VM_MTE VM_HIGH_ARCH_0 /* Use Tagged memory for access control */ |
| # define VM_MTE_ALLOWED VM_HIGH_ARCH_1 /* Tagged memory permitted */ |
| #else |
| # define VM_MTE VM_NONE |
| # define VM_MTE_ALLOWED VM_NONE |
| #endif |
| |
| #ifndef VM_GROWSUP |
| # define VM_GROWSUP VM_NONE |
| #endif |
| |
| /* Bits set in the VMA until the stack is in its final location */ |
| #define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) |
| |
| #define TASK_EXEC ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) |
| |
| /* Common data flag combinations */ |
| #define VM_DATA_FLAGS_TSK_EXEC (VM_READ | VM_WRITE | TASK_EXEC | \ |
| VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
| #define VM_DATA_FLAGS_NON_EXEC (VM_READ | VM_WRITE | VM_MAYREAD | \ |
| VM_MAYWRITE | VM_MAYEXEC) |
| #define VM_DATA_FLAGS_EXEC (VM_READ | VM_WRITE | VM_EXEC | \ |
| VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
| |
| #ifndef VM_DATA_DEFAULT_FLAGS /* arch can override this */ |
| #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_EXEC |
| #endif |
| |
| #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ |
| #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS |
| #endif |
| |
| #ifdef CONFIG_STACK_GROWSUP |
| #define VM_STACK VM_GROWSUP |
| #else |
| #define VM_STACK VM_GROWSDOWN |
| #endif |
| |
| #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) |
| |
| /* VMA basic access permission flags */ |
| #define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) |
| |
| |
| /* |
| * Special vmas that are non-mergable, non-mlock()able. |
| */ |
| #define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_PFNMAP | VM_MIXEDMAP) |
| |
| /* This mask prevents VMA from being scanned with khugepaged */ |
| #define VM_NO_KHUGEPAGED (VM_SPECIAL | VM_HUGETLB) |
| |
| /* This mask defines which mm->def_flags a process can inherit its parent */ |
| #define VM_INIT_DEF_MASK VM_NOHUGEPAGE |
| |
| /* This mask is used to clear all the VMA flags used by mlock */ |
| #define VM_LOCKED_CLEAR_MASK (~(VM_LOCKED | VM_LOCKONFAULT)) |
| |
| /* Arch-specific flags to clear when updating VM flags on protection change */ |
| #ifndef VM_ARCH_CLEAR |
| # define VM_ARCH_CLEAR VM_NONE |
| #endif |
| #define VM_FLAGS_CLEAR (ARCH_VM_PKEY_FLAGS | VM_ARCH_CLEAR) |
| |
| /* |
| * mapping from the currently active vm_flags protection bits (the |
| * low four bits) to a page protection mask.. |
| */ |
| extern pgprot_t protection_map[16]; |
| |
| /** |
| * Fault flag definitions. |
| * |
| * @FAULT_FLAG_WRITE: Fault was a write fault. |
| * @FAULT_FLAG_MKWRITE: Fault was mkwrite of existing PTE. |
| * @FAULT_FLAG_ALLOW_RETRY: Allow to retry the fault if blocked. |
| * @FAULT_FLAG_RETRY_NOWAIT: Don't drop mmap_lock and wait when retrying. |
| * @FAULT_FLAG_KILLABLE: The fault task is in SIGKILL killable region. |
| * @FAULT_FLAG_TRIED: The fault has been tried once. |
| * @FAULT_FLAG_USER: The fault originated in userspace. |
| * @FAULT_FLAG_REMOTE: The fault is not for current task/mm. |
| * @FAULT_FLAG_INSTRUCTION: The fault was during an instruction fetch. |
| * @FAULT_FLAG_INTERRUPTIBLE: The fault can be interrupted by non-fatal signals. |
| * |
| * About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify |
| * whether we would allow page faults to retry by specifying these two |
| * fault flags correctly. Currently there can be three legal combinations: |
| * |
| * (a) ALLOW_RETRY and !TRIED: this means the page fault allows retry, and |
| * this is the first try |
| * |
| * (b) ALLOW_RETRY and TRIED: this means the page fault allows retry, and |
| * we've already tried at least once |
| * |
| * (c) !ALLOW_RETRY and !TRIED: this means the page fault does not allow retry |
| * |
| * The unlisted combination (!ALLOW_RETRY && TRIED) is illegal and should never |
| * be used. Note that page faults can be allowed to retry for multiple times, |
| * in which case we'll have an initial fault with flags (a) then later on |
| * continuous faults with flags (b). We should always try to detect pending |
| * signals before a retry to make sure the continuous page faults can still be |
| * interrupted if necessary. |
| */ |
| #define FAULT_FLAG_WRITE 0x01 |
| #define FAULT_FLAG_MKWRITE 0x02 |
| #define FAULT_FLAG_ALLOW_RETRY 0x04 |
| #define FAULT_FLAG_RETRY_NOWAIT 0x08 |
| #define FAULT_FLAG_KILLABLE 0x10 |
| #define FAULT_FLAG_TRIED 0x20 |
| #define FAULT_FLAG_USER 0x40 |
| #define FAULT_FLAG_REMOTE 0x80 |
| #define FAULT_FLAG_INSTRUCTION 0x100 |
| #define FAULT_FLAG_INTERRUPTIBLE 0x200 |
| |
| /* |
| * The default fault flags that should be used by most of the |
| * arch-specific page fault handlers. |
| */ |
| #define FAULT_FLAG_DEFAULT (FAULT_FLAG_ALLOW_RETRY | \ |
| FAULT_FLAG_KILLABLE | \ |
| FAULT_FLAG_INTERRUPTIBLE) |
| |
| /** |
| * fault_flag_allow_retry_first - check ALLOW_RETRY the first time |
| * |
| * This is mostly used for places where we want to try to avoid taking |
| * the mmap_lock for too long a time when waiting for another condition |
| * to change, in which case we can try to be polite to release the |
| * mmap_lock in the first round to avoid potential starvation of other |
| * processes that would also want the mmap_lock. |
| * |
| * Return: true if the page fault allows retry and this is the first |
| * attempt of the fault handling; false otherwise. |
| */ |
| static inline bool fault_flag_allow_retry_first(unsigned int flags) |
| { |
| return (flags & FAULT_FLAG_ALLOW_RETRY) && |
| (!(flags & FAULT_FLAG_TRIED)); |
| } |
| |
| #define FAULT_FLAG_TRACE \ |
| { FAULT_FLAG_WRITE, "WRITE" }, \ |
| { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ |
| { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ |
| { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ |
| { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ |
| { FAULT_FLAG_TRIED, "TRIED" }, \ |
| { FAULT_FLAG_USER, "USER" }, \ |
| { FAULT_FLAG_REMOTE, "REMOTE" }, \ |
| { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \ |
| { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" } |
| |
| /* |
| * vm_fault is filled by the pagefault handler and passed to the vma's |
| * ->fault function. The vma's ->fault is responsible for returning a bitmask |
| * of VM_FAULT_xxx flags that give details about how the fault was handled. |
| * |
| * MM layer fills up gfp_mask for page allocations but fault handler might |
| * alter it if its implementation requires a different allocation context. |
| * |
| * pgoff should be used in favour of virtual_address, if possible. |
| */ |
| struct vm_fault { |
| const struct { |
| struct vm_area_struct *vma; /* Target VMA */ |
| gfp_t gfp_mask; /* gfp mask to be used for allocations */ |
| pgoff_t pgoff; /* Logical page offset based on vma */ |
| unsigned long address; /* Faulting virtual address */ |
| }; |
| unsigned int flags; /* FAULT_FLAG_xxx flags |
| * XXX: should really be 'const' */ |
| pmd_t *pmd; /* Pointer to pmd entry matching |
| * the 'address' */ |
| pud_t *pud; /* Pointer to pud entry matching |
| * the 'address' |
| */ |
| pte_t orig_pte; /* Value of PTE at the time of fault */ |
| |
| struct page *cow_page; /* Page handler may use for COW fault */ |
| struct page *page; /* ->fault handlers should return a |
| * page here, unless VM_FAULT_NOPAGE |
| * is set (which is also implied by |
| * VM_FAULT_ERROR). |
| */ |
| /* These three entries are valid only while holding ptl lock */ |
| pte_t *pte; /* Pointer to pte entry matching |
| * the 'address'. NULL if the page |
| * table hasn't been allocated. |
| */ |
| spinlock_t *ptl; /* Page table lock. |
| * Protects pte page table if 'pte' |
| * is not NULL, otherwise pmd. |
| */ |
| pgtable_t prealloc_pte; /* Pre-allocated pte page table. |
| * vm_ops->map_pages() sets up a page |
| * table from atomic context. |
| * do_fault_around() pre-allocates |
| * page table to avoid allocation from |
| * atomic context. |
| */ |
| }; |
| |
| /* page entry size for vm->huge_fault() */ |
| enum page_entry_size { |
| PE_SIZE_PTE = 0, |
| PE_SIZE_PMD, |
| PE_SIZE_PUD, |
| }; |
| |
| /* |
| * These are the virtual MM functions - opening of an area, closing and |
| * unmapping it (needed to keep files on disk up-to-date etc), pointer |
| * to the functions called when a no-page or a wp-page exception occurs. |
| */ |
| struct vm_operations_struct { |
| void (*open)(struct vm_area_struct * area); |
| void (*close)(struct vm_area_struct * area); |
| /* Called any time before splitting to check if it's allowed */ |
| int (*may_split)(struct vm_area_struct *area, unsigned long addr); |
| int (*mremap)(struct vm_area_struct *area, unsigned long flags); |
| /* |
| * Called by mprotect() to make driver-specific permission |
| * checks before mprotect() is finalised. The VMA must not |
| * be modified. Returns 0 if eprotect() can proceed. |
| */ |
| int (*mprotect)(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end, unsigned long newflags); |
| vm_fault_t (*fault)(struct vm_fault *vmf); |
| vm_fault_t (*huge_fault)(struct vm_fault *vmf, |
| enum page_entry_size pe_size); |
| vm_fault_t (*map_pages)(struct vm_fault *vmf, |
| pgoff_t start_pgoff, pgoff_t end_pgoff); |
| unsigned long (*pagesize)(struct vm_area_struct * area); |
| |
| /* notification that a previously read-only page is about to become |
| * writable, if an error is returned it will cause a SIGBUS */ |
| vm_fault_t (*page_mkwrite)(struct vm_fault *vmf); |
| |
| /* same as page_mkwrite when using VM_PFNMAP|VM_MIXEDMAP */ |
| vm_fault_t (*pfn_mkwrite)(struct vm_fault *vmf); |
| |
| /* called by access_process_vm when get_user_pages() fails, typically |
| * for use by special VMAs. See also generic_access_phys() for a generic |
| * implementation useful for any iomem mapping. |
| */ |
| int (*access)(struct vm_area_struct *vma, unsigned long addr, |
| void *buf, int len, int write); |
| |
| /* Called by the /proc/PID/maps code to ask the vma whether it |
| * has a special name. Returning non-NULL will also cause this |
| * vma to be dumped unconditionally. */ |
| const char *(*name)(struct vm_area_struct *vma); |
| |
| #ifdef CONFIG_NUMA |
| /* |
| * set_policy() op must add a reference to any non-NULL @new mempolicy |
| * to hold the policy upon return. Caller should pass NULL @new to |
| * remove a policy and fall back to surrounding context--i.e. do not |
| * install a MPOL_DEFAULT policy, nor the task or system default |
| * mempolicy. |
| */ |
| int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); |
| |
| /* |
| * get_policy() op must add reference [mpol_get()] to any policy at |
| * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure |
| * in mm/mempolicy.c will do this automatically. |
| * get_policy() must NOT add a ref if the policy at (vma,addr) is not |
| * marked as MPOL_SHARED. vma policies are protected by the mmap_lock. |
| * If no [shared/vma] mempolicy exists at the addr, get_policy() op |
| * must return NULL--i.e., do not "fallback" to task or system default |
| * policy. |
| */ |
| struct mempolicy *(*get_policy)(struct vm_area_struct *vma, |
| unsigned long addr); |
| #endif |
| /* |
| * Called by vm_normal_page() for special PTEs to find the |
| * page for @addr. This is useful if the default behavior |
| * (using pte_page()) would not find the correct page. |
| */ |
| struct page *(*find_special_page)(struct vm_area_struct *vma, |
| unsigned long addr); |
| }; |
| |
| static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) |
| { |
| static const struct vm_operations_struct dummy_vm_ops = {}; |
| |
| memset(vma, 0, sizeof(*vma)); |
| vma->vm_mm = mm; |
| vma->vm_ops = &dummy_vm_ops; |
| INIT_LIST_HEAD(&vma->anon_vma_chain); |
| } |
| |
| static inline void vma_set_anonymous(struct vm_area_struct *vma) |
| { |
| vma->vm_ops = NULL; |
| } |
| |
| static inline bool vma_is_anonymous(struct vm_area_struct *vma) |
| { |
| return !vma->vm_ops; |
| } |
| |
| static inline bool vma_is_temporary_stack(struct vm_area_struct *vma) |
| { |
| int maybe_stack = vma->vm_flags & (VM_GROWSDOWN | VM_GROWSUP); |
| |
| if (!maybe_stack) |
| return false; |
| |
| if ((vma->vm_flags & VM_STACK_INCOMPLETE_SETUP) == |
| VM_STACK_INCOMPLETE_SETUP) |
| return true; |
| |
| return false; |
| } |
| |
| static inline bool vma_is_foreign(struct vm_area_struct *vma) |
| { |
| if (!current->mm) |
| return true; |
| |
| if (current->mm != vma->vm_mm) |
| return true; |
| |
| return false; |
| } |
| |
| static inline bool vma_is_accessible(struct vm_area_struct *vma) |
| { |
| return vma->vm_flags & VM_ACCESS_FLAGS; |
| } |
| |
| #ifdef CONFIG_SHMEM |
| /* |
| * The vma_is_shmem is not inline because it is used only by slow |
| * paths in userfault. |
| */ |
| bool vma_is_shmem(struct vm_area_struct *vma); |
| #else |
| static inline bool vma_is_shmem(struct vm_area_struct *vma) { return false; } |
| #endif |
| |
| int vma_is_stack_for_current(struct vm_area_struct *vma); |
| |
| /* flush_tlb_range() takes a vma, not a mm, and can care about flags */ |
| #define TLB_FLUSH_VMA(mm,flags) { .vm_mm = (mm), .vm_flags = (flags) } |
| |
| struct mmu_gather; |
| struct inode; |
| |
| #include <linux/huge_mm.h> |
| |
| /* |
| * Methods to modify the page usage count. |
| * |
| * What counts for a page usage: |
| * - cache mapping (page->mapping) |
| * - private data (page->private) |
| * - page mapped in a task's page tables, each mapping |
| * is counted separately |
| * |
| * Also, many kernel routines increase the page count before a critical |
| * routine so they can be sure the page doesn't go away from under them. |
| */ |
| |
| /* |
| * Drop a ref, return true if the refcount fell to zero (the page has no users) |
| */ |
| static inline int put_page_testzero(struct page *page) |
| { |
| VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); |
| return page_ref_dec_and_test(page); |
| } |
| |
| /* |
| * Try to grab a ref unless the page has a refcount of zero, return false if |
| * that is the case. |
| * This can be called when MMU is off so it must not access |
| * any of the virtual mappings. |
| */ |
| static inline int get_page_unless_zero(struct page *page) |
| { |
| return page_ref_add_unless(page, 1, 0); |
| } |
| |
| extern int page_is_ram(unsigned long pfn); |
| |
| enum { |
| REGION_INTERSECTS, |
| REGION_DISJOINT, |
| REGION_MIXED, |
| }; |
| |
| int region_intersects(resource_size_t offset, size_t size, unsigned long flags, |
| unsigned long desc); |
| |
| /* Support for virtually mapped pages */ |
| struct page *vmalloc_to_page(const void *addr); |
| unsigned long vmalloc_to_pfn(const void *addr); |
| |
| /* |
| * Determine if an address is within the vmalloc range |
| * |
| * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there |
| * is no special casing required. |
| */ |
| |
| #ifndef is_ioremap_addr |
| #define is_ioremap_addr(x) is_vmalloc_addr(x) |
| #endif |
| |
| #ifdef CONFIG_MMU |
| extern bool is_vmalloc_addr(const void *x); |
| extern int is_vmalloc_or_module_addr(const void *x); |
| #else |
| static inline bool is_vmalloc_addr(const void *x) |
| { |
| return false; |
| } |
| static inline int is_vmalloc_or_module_addr(const void *x) |
| { |
| return 0; |
| } |
| #endif |
| |
| extern void *kvmalloc_node(size_t size, gfp_t flags, int node); |
| static inline void *kvmalloc(size_t size, gfp_t flags) |
| { |
| return kvmalloc_node(size, flags, NUMA_NO_NODE); |
| } |
| static inline void *kvzalloc_node(size_t size, gfp_t flags, int node) |
| { |
| return kvmalloc_node(size, flags | __GFP_ZERO, node); |
| } |
| static inline void *kvzalloc(size_t size, gfp_t flags) |
| { |
| return kvmalloc(size, flags | __GFP_ZERO); |
| } |
| |
| static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags) |
| { |
| size_t bytes; |
| |
| if (unlikely(check_mul_overflow(n, size, &bytes))) |
| return NULL; |
| |
| return kvmalloc(bytes, flags); |
| } |
| |
| static inline void *kvcalloc(size_t n, size_t size, gfp_t flags) |
| { |
| return kvmalloc_array(n, size, flags | __GFP_ZERO); |
| } |
| |
| extern void kvfree(const void *addr); |
| extern void kvfree_sensitive(const void *addr, size_t len); |
| |
| static inline int head_compound_mapcount(struct page *head) |
| { |
| return atomic_read(compound_mapcount_ptr(head)) + 1; |
| } |
| |
| /* |
| * Mapcount of compound page as a whole, does not include mapped sub-pages. |
| * |
| * Must be called only for compound pages or any their tail sub-pages. |
| */ |
| static inline int compound_mapcount(struct page *page) |
| { |
| VM_BUG_ON_PAGE(!PageCompound(page), page); |
| page = compound_head(page); |
| return head_compound_mapcount(page); |
| } |
| |
| /* |
| * The atomic page->_mapcount, starts from -1: so that transitions |
| * both from it and to it can be tracked, using atomic_inc_and_test |
| * and atomic_add_negative(-1). |
| */ |
| static inline void page_mapcount_reset(struct page *page) |
| { |
| atomic_set(&(page)->_mapcount, -1); |
| } |
| |
| int __page_mapcount(struct page *page); |
| |
| /* |
| * Mapcount of 0-order page; when compound sub-page, includes |
| * compound_mapcount(). |
| * |
| * Result is undefined for pages which cannot be mapped into userspace. |
| * For example SLAB or special types of pages. See function page_has_type(). |
| * They use this place in struct page differently. |
| */ |
| static inline int page_mapcount(struct page *page) |
| { |
| if (unlikely(PageCompound(page))) |
| return __page_mapcount(page); |
| return atomic_read(&page->_mapcount) + 1; |
| } |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| int total_mapcount(struct page *page); |
| int page_trans_huge_mapcount(struct page *page, int *total_mapcount); |
| #else |
| static inline int total_mapcount(struct page *page) |
| { |
| return page_mapcount(page); |
| } |
| static inline int page_trans_huge_mapcount(struct page *page, |
| int *total_mapcount) |
| { |
| int mapcount = page_mapcount(page); |
| if (total_mapcount) |
| *total_mapcount = mapcount; |
| return mapcount; |
| } |
| #endif |
| |
| static inline struct page *virt_to_head_page(const void *x) |
| { |
| struct page *page = virt_to_page(x); |
| |
| return compound_head(page); |
| } |
| |
| void __put_page(struct page *page); |
| |
| void put_pages_list(struct list_head *pages); |
| |
| void split_page(struct page *page, unsigned int order); |
| |
| /* |
| * Compound pages have a destructor function. Provide a |
| * prototype for that function and accessor functions. |
| * These are _only_ valid on the head of a compound page. |
| */ |
| typedef void compound_page_dtor(struct page *); |
| |
| /* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */ |
| enum compound_dtor_id { |
| NULL_COMPOUND_DTOR, |
| COMPOUND_PAGE_DTOR, |
| #ifdef CONFIG_HUGETLB_PAGE |
| HUGETLB_PAGE_DTOR, |
| #endif |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| TRANSHUGE_PAGE_DTOR, |
| #endif |
| NR_COMPOUND_DTORS, |
| }; |
| extern compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS]; |
| |
| static inline void set_compound_page_dtor(struct page *page, |
| enum compound_dtor_id compound_dtor) |
| { |
| VM_BUG_ON_PAGE(compound_dtor >= NR_COMPOUND_DTORS, page); |
| page[1].compound_dtor = compound_dtor; |
| } |
| |
| static inline void destroy_compound_page(struct page *page) |
| { |
| VM_BUG_ON_PAGE(page[1].compound_dtor >= NR_COMPOUND_DTORS, page); |
| compound_page_dtors[page[1].compound_dtor](page); |
| } |
| |
| static inline unsigned int compound_order(struct page *page) |
| { |
| if (!PageHead(page)) |
| return 0; |
| return page[1].compound_order; |
| } |
| |
| static inline bool hpage_pincount_available(struct page *page) |
| { |
| /* |
| * Can the page->hpage_pinned_refcount field be used? That field is in |
| * the 3rd page of the compound page, so the smallest (2-page) compound |
| * pages cannot support it. |
| */ |
| page = compound_head(page); |
| return PageCompound(page) && compound_order(page) > 1; |
| } |
| |
| static inline int head_compound_pincount(struct page *head) |
| { |
| return atomic_read(compound_pincount_ptr(head)); |
| } |
| |
| static inline int compound_pincount(struct page *page) |
| { |
| VM_BUG_ON_PAGE(!hpage_pincount_available(page), page); |
| page = compound_head(page); |
| return head_compound_pincount(page); |
| } |
| |
| static inline void set_compound_order(struct page *page, unsigned int order) |
| { |
| page[1].compound_order = order; |
| page[1].compound_nr = 1U << order; |
| } |
| |
| /* Returns the number of pages in this potentially compound page. */ |
| static inline unsigned long compound_nr(struct page *page) |
| { |
| if (!PageHead(page)) |
| return 1; |
| return page[1].compound_nr; |
| } |
| |
| /* Returns the number of bytes in this potentially compound page. */ |
| static inline unsigned long page_size(struct page *page) |
| { |
| return PAGE_SIZE << compound_order(page); |
| } |
| |
| /* Returns the number of bits needed for the number of bytes in a page */ |
| static inline unsigned int page_shift(struct page *page) |
| { |
| return PAGE_SHIFT + compound_order(page); |
| } |
| |
| void free_compound_page(struct page *page); |
| |
| #ifdef CONFIG_MMU |
| /* |
| * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when |
| * servicing faults for write access. In the normal case, do always want |
| * pte_mkwrite. But get_user_pages can cause write faults for mappings |
| * that do not have writing enabled, when used by access_process_vm. |
| */ |
| static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) |
| { |
| if (likely(vma->vm_flags & VM_WRITE)) |
| pte = pte_mkwrite(pte); |
| return pte; |
| } |
| |
| vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page); |
| void do_set_pte(struct vm_fault *vmf, struct page *page, unsigned long addr); |
| |
| vm_fault_t finish_fault(struct vm_fault *vmf); |
| vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf); |
| #endif |
| |
| /* |
| * Multiple processes may "see" the same page. E.g. for untouched |
| * mappings of /dev/null, all processes see the same page full of |
| * zeroes, and text pages of executables and shared libraries have |
| * only one copy in memory, at most, normally. |
| * |
| * For the non-reserved pages, page_count(page) denotes a reference count. |
| * page_count() == 0 means the page is free. page->lru is then used for |
| * freelist management in the buddy allocator. |
| * page_count() > 0 means the page has been allocated. |
| * |
| * Pages are allocated by the slab allocator in order to provide memory |
| * to kmalloc and kmem_cache_alloc. In this case, the management of the |
| * page, and the fields in 'struct page' are the responsibility of mm/slab.c |
| * unless a particular usage is carefully commented. (the responsibility of |
| * freeing the kmalloc memory is the caller's, of course). |
| * |
| * A page may be used by anyone else who does a __get_free_page(). |
| * In this case, page_count still tracks the references, and should only |
| * be used through the normal accessor functions. The top bits of page->flags |
| * and page->virtual store page management information, but all other fields |
| * are unused and could be used privately, carefully. The management of this |
| * page is the responsibility of the one who allocated it, and those who have |
| * subsequently been given references to it. |
| * |
| * The other pages (we may call them "pagecache pages") are completely |
| * managed by the Linux memory manager: I/O, buffers, swapping etc. |
| * The following discussion applies only to them. |
| * |
| * A pagecache page contains an opaque `private' member, which belongs to the |
| * page's address_space. Usually, this is the address of a circular list of |
| * the page's disk buffers. PG_private must be set to tell the VM to call |
| * into the filesystem to release these pages. |
| * |
| * A page may belong to an inode's memory mapping. In this case, page->mapping |
| * is the pointer to the inode, and page->index is the file offset of the page, |
| * in units of PAGE_SIZE. |
| * |
| * If pagecache pages are not associated with an inode, they are said to be |
| * anonymous pages. These may become associated with the swapcache, and in that |
| * case PG_swapcache is set, and page->private is an offset into the swapcache. |
| * |
| * In either case (swapcache or inode backed), the pagecache itself holds one |
| * reference to the page. Setting PG_private should also increment the |
| * refcount. The each user mapping also has a reference to the page. |
| * |
| * The pagecache pages are stored in a per-mapping radix tree, which is |
| * rooted at mapping->i_pages, and indexed by offset. |
| * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space |
| * lists, we instead now tag pages as dirty/writeback in the radix tree. |
| * |
| * All pagecache pages may be subject to I/O: |
| * - inode pages may need to be read from disk, |
| * - inode pages which have been modified and are MAP_SHARED may need |
| * to be written back to the inode on disk, |
| * - anonymous pages (including MAP_PRIVATE file mappings) which have been |
| * modified may need to be swapped out to swap space and (later) to be read |
| * back into memory. |
| */ |
| |
| /* |
| * The zone field is never updated after free_area_init_core() |
| * sets it, so none of the operations on it need to be atomic. |
| */ |
| |
| /* Page flags: | [SECTION] | [NODE] | ZONE | [LAST_CPUPID] | ... | FLAGS | */ |
| #define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) |
| #define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) |
| #define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) |
| #define LAST_CPUPID_PGOFF (ZONES_PGOFF - LAST_CPUPID_WIDTH) |
| #define KASAN_TAG_PGOFF (LAST_CPUPID_PGOFF - KASAN_TAG_WIDTH) |
| |
| /* |
| * Define the bit shifts to access each section. For non-existent |
| * sections we define the shift as 0; that plus a 0 mask ensures |
| * the compiler will optimise away reference to them. |
| */ |
| #define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) |
| #define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) |
| #define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) |
| #define LAST_CPUPID_PGSHIFT (LAST_CPUPID_PGOFF * (LAST_CPUPID_WIDTH != 0)) |
| #define KASAN_TAG_PGSHIFT (KASAN_TAG_PGOFF * (KASAN_TAG_WIDTH != 0)) |
| |
| /* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ |
| #ifdef NODE_NOT_IN_PAGE_FLAGS |
| #define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) |
| #define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ |
| SECTIONS_PGOFF : ZONES_PGOFF) |
| #else |
| #define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) |
| #define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ |
| NODES_PGOFF : ZONES_PGOFF) |
| #endif |
| |
| #define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) |
| |
| #define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) |
| #define NODES_MASK ((1UL << NODES_WIDTH) - 1) |
| #define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) |
| #define LAST_CPUPID_MASK ((1UL << LAST_CPUPID_SHIFT) - 1) |
| #define KASAN_TAG_MASK ((1UL << KASAN_TAG_WIDTH) - 1) |
| #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) |
| |
| static inline enum zone_type page_zonenum(const struct page *page) |
| { |
| ASSERT_EXCLUSIVE_BITS(page->flags, ZONES_MASK << ZONES_PGSHIFT); |
| return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; |
| } |
| |
| #ifdef CONFIG_ZONE_DEVICE |
| static inline bool is_zone_device_page(const struct page *page) |
| { |
| return page_zonenum(page) == ZONE_DEVICE; |
| } |
| extern void memmap_init_zone_device(struct zone *, unsigned long, |
| unsigned long, struct dev_pagemap *); |
| #else |
| static inline bool is_zone_device_page(const struct page *page) |
| { |
| return false; |
| } |
| #endif |
| |
| #ifdef CONFIG_DEV_PAGEMAP_OPS |
| void free_devmap_managed_page(struct page *page); |
| DECLARE_STATIC_KEY_FALSE(devmap_managed_key); |
| |
| static inline bool page_is_devmap_managed(struct page *page) |
| { |
| if (!static_branch_unlikely(&devmap_managed_key)) |
| return false; |
| if (!is_zone_device_page(page)) |
| return false; |
| switch (page->pgmap->type) { |
| case MEMORY_DEVICE_PRIVATE: |
| case MEMORY_DEVICE_FS_DAX: |
| return true; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| void put_devmap_managed_page(struct page *page); |
| |
| #else /* CONFIG_DEV_PAGEMAP_OPS */ |
| static inline bool page_is_devmap_managed(struct page *page) |
| { |
| return false; |
| } |
| |
| static inline void put_devmap_managed_page(struct page *page) |
| { |
| } |
| #endif /* CONFIG_DEV_PAGEMAP_OPS */ |
| |
| static inline bool is_device_private_page(const struct page *page) |
| { |
| return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) && |
| IS_ENABLED(CONFIG_DEVICE_PRIVATE) && |
| is_zone_device_page(page) && |
| page->pgmap->type == MEMORY_DEVICE_PRIVATE; |
| } |
| |
| static inline bool is_pci_p2pdma_page(const struct page *page) |
| { |
| return IS_ENABLED(CONFIG_DEV_PAGEMAP_OPS) && |
| IS_ENABLED(CONFIG_PCI_P2PDMA) && |
| is_zone_device_page(page) && |
| page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA; |
| } |
| |
| /* 127: arbitrary random number, small enough to assemble well */ |
| #define page_ref_zero_or_close_to_overflow(page) \ |
| ((unsigned int) page_ref_count(page) + 127u <= 127u) |
| |
| static inline void get_page(struct page *page) |
| { |
| page = compound_head(page); |
| /* |
| * Getting a normal page or the head of a compound page |
| * requires to already have an elevated page->_refcount. |
| */ |
| VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(page), page); |
| page_ref_inc(page); |
| } |
| |
| bool __must_check try_grab_page(struct page *page, unsigned int flags); |
| __maybe_unused struct page *try_grab_compound_head(struct page *page, int refs, |
| unsigned int flags); |
| |
| |
| static inline __must_check bool try_get_page(struct page *page) |
| { |
| page = compound_head(page); |
| if (WARN_ON_ONCE(page_ref_count(page) <= 0)) |
| return false; |
| page_ref_inc(page); |
| return true; |
| } |
| |
| static inline void put_page(struct page *page) |
| { |
| page = compound_head(page); |
| |
| /* |
| * For devmap managed pages we need to catch refcount transition from |
| * 2 to 1, when refcount reach one it means the page is free and we |
| * need to inform the device driver through callback. See |
| * include/linux/memremap.h and HMM for details. |
| */ |
| if (page_is_devmap_managed(page)) { |
| put_devmap_managed_page(page); |
| return; |
| } |
| |
| if (put_page_testzero(page)) |
| __put_page(page); |
| } |
| |
| /* |
| * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload |
| * the page's refcount so that two separate items are tracked: the original page |
| * reference count, and also a new count of how many pin_user_pages() calls were |
| * made against the page. ("gup-pinned" is another term for the latter). |
| * |
| * With this scheme, pin_user_pages() becomes special: such pages are marked as |
| * distinct from normal pages. As such, the unpin_user_page() call (and its |
| * variants) must be used in order to release gup-pinned pages. |
| * |
| * Choice of value: |
| * |
| * By making GUP_PIN_COUNTING_BIAS a power of two, debugging of page reference |
| * counts with respect to pin_user_pages() and unpin_user_page() becomes |
| * simpler, due to the fact that adding an even power of two to the page |
| * refcount has the effect of using only the upper N bits, for the code that |
| * counts up using the bias value. This means that the lower bits are left for |
| * the exclusive use of the original code that increments and decrements by one |
| * (or at least, by much smaller values than the bias value). |
| * |
| * Of course, once the lower bits overflow into the upper bits (and this is |
| * OK, because subtraction recovers the original values), then visual inspection |
| * no longer suffices to directly view the separate counts. However, for normal |
| * applications that don't have huge page reference counts, this won't be an |
| * issue. |
| * |
| * Locking: the lockless algorithm described in page_cache_get_speculative() |
| * and page_cache_gup_pin_speculative() provides safe operation for |
| * get_user_pages and page_mkclean and other calls that race to set up page |
| * table entries. |
| */ |
| #define GUP_PIN_COUNTING_BIAS (1U << 10) |
| |
| void unpin_user_page(struct page *page); |
| void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages, |
| bool make_dirty); |
| void unpin_user_pages(struct page **pages, unsigned long npages); |
| |
| /** |
| * page_maybe_dma_pinned() - report if a page is pinned for DMA. |
| * |
| * This function checks if a page has been pinned via a call to |
| * pin_user_pages*(). |
| * |
| * For non-huge pages, the return value is partially fuzzy: false is not fuzzy, |
| * because it means "definitely not pinned for DMA", but true means "probably |
| * pinned for DMA, but possibly a false positive due to having at least |
| * GUP_PIN_COUNTING_BIAS worth of normal page references". |
| * |
| * False positives are OK, because: a) it's unlikely for a page to get that many |
| * refcounts, and b) all the callers of this routine are expected to be able to |
| * deal gracefully with a false positive. |
| * |
| * For huge pages, the result will be exactly correct. That's because we have |
| * more tracking data available: the 3rd struct page in the compound page is |
| * used to track the pincount (instead using of the GUP_PIN_COUNTING_BIAS |
| * scheme). |
| * |
| * For more information, please see Documentation/core-api/pin_user_pages.rst. |
| * |
| * @page: pointer to page to be queried. |
| * @Return: True, if it is likely that the page has been "dma-pinned". |
| * False, if the page is definitely not dma-pinned. |
| */ |
| static inline bool page_maybe_dma_pinned(struct page *page) |
| { |
| if (hpage_pincount_available(page)) |
| return compound_pincount(page) > 0; |
| |
| /* |
| * page_ref_count() is signed. If that refcount overflows, then |
| * page_ref_count() returns a negative value, and callers will avoid |
| * further incrementing the refcount. |
| * |
| * Here, for that overflow case, use the signed bit to count a little |
| * bit higher via unsigned math, and thus still get an accurate result. |
| */ |
| return ((unsigned int)page_ref_count(compound_head(page))) >= |
| GUP_PIN_COUNTING_BIAS; |
| } |
| |
| #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) |
| #define SECTION_IN_PAGE_FLAGS |
| #endif |
| |
| /* |
| * The identification function is mainly used by the buddy allocator for |
| * determining if two pages could be buddies. We are not really identifying |
| * the zone since we could be using the section number id if we do not have |
| * node id available in page flags. |
| * We only guarantee that it will return the same value for two combinable |
| * pages in a zone. |
| */ |
| static inline int page_zone_id(struct page *page) |
| { |
| return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; |
| } |
| |
| #ifdef NODE_NOT_IN_PAGE_FLAGS |
| extern int page_to_nid(const struct page *page); |
| #else |
| static inline int page_to_nid(const struct page *page) |
| { |
| struct page *p = (struct page *)page; |
| |
| return (PF_POISONED_CHECK(p)->flags >> NODES_PGSHIFT) & NODES_MASK; |
| } |
| #endif |
| |
| #ifdef CONFIG_NUMA_BALANCING |
| static inline int cpu_pid_to_cpupid(int cpu, int pid) |
| { |
| return ((cpu & LAST__CPU_MASK) << LAST__PID_SHIFT) | (pid & LAST__PID_MASK); |
| } |
| |
| static inline int cpupid_to_pid(int cpupid) |
| { |
| return cpupid & LAST__PID_MASK; |
| } |
| |
| static inline int cpupid_to_cpu(int cpupid) |
| { |
| return (cpupid >> LAST__PID_SHIFT) & LAST__CPU_MASK; |
| } |
| |
| static inline int cpupid_to_nid(int cpupid) |
| { |
| return cpu_to_node(cpupid_to_cpu(cpupid)); |
| } |
| |
| static inline bool cpupid_pid_unset(int cpupid) |
| { |
| return cpupid_to_pid(cpupid) == (-1 & LAST__PID_MASK); |
| } |
| |
| static inline bool cpupid_cpu_unset(int cpupid) |
| { |
| return cpupid_to_cpu(cpupid) == (-1 & LAST__CPU_MASK); |
| } |
| |
| static inline bool __cpupid_match_pid(pid_t task_pid, int cpupid) |
| { |
| return (task_pid & LAST__PID_MASK) == cpupid_to_pid(cpupid); |
| } |
| |
| #define cpupid_match_pid(task, cpupid) __cpupid_match_pid(task->pid, cpupid) |
| #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS |
| static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
| { |
| return xchg(&page->_last_cpupid, cpupid & LAST_CPUPID_MASK); |
| } |
| |
| static inline int page_cpupid_last(struct page *page) |
| { |
| return page->_last_cpupid; |
| } |
| static inline void page_cpupid_reset_last(struct page *page) |
| { |
| page->_last_cpupid = -1 & LAST_CPUPID_MASK; |
| } |
| #else |
| static inline int page_cpupid_last(struct page *page) |
| { |
| return (page->flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; |
| } |
| |
| extern int page_cpupid_xchg_last(struct page *page, int cpupid); |
| |
| static inline void page_cpupid_reset_last(struct page *page) |
| { |
| page->flags |= LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT; |
| } |
| #endif /* LAST_CPUPID_NOT_IN_PAGE_FLAGS */ |
| #else /* !CONFIG_NUMA_BALANCING */ |
| static inline int page_cpupid_xchg_last(struct page *page, int cpupid) |
| { |
| return page_to_nid(page); /* XXX */ |
| } |
| |
| static inline int page_cpupid_last(struct page *page) |
| { |
| return page_to_nid(page); /* XXX */ |
| } |
| |
| static inline int cpupid_to_nid(int cpupid) |
| { |
| return -1; |
| } |
| |
| static inline int cpupid_to_pid(int cpupid) |
| { |
| return -1; |
| } |
| |
| static inline int cpupid_to_cpu(int cpupid) |
| { |
| return -1; |
| } |
| |
| static inline int cpu_pid_to_cpupid(int nid, int pid) |
| { |
| return -1; |
| } |
| |
| static inline bool cpupid_pid_unset(int cpupid) |
| { |
| return true; |
| } |
| |
| static inline void page_cpupid_reset_last(struct page *page) |
| { |
| } |
| |
| static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) |
| { |
| return false; |
| } |
| #endif /* CONFIG_NUMA_BALANCING */ |
| |
| #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
| |
| static inline u8 page_kasan_tag(const struct page *page) |
| { |
| if (kasan_enabled()) |
| return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; |
| return 0xff; |
| } |
| |
| static inline void page_kasan_tag_set(struct page *page, u8 tag) |
| { |
| if (kasan_enabled()) { |
| page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); |
| page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; |
| } |
| } |
| |
| static inline void page_kasan_tag_reset(struct page *page) |
| { |
| if (kasan_enabled()) |
| page_kasan_tag_set(page, 0xff); |
| } |
| |
| #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ |
| |
| static inline u8 page_kasan_tag(const struct page *page) |
| { |
| return 0xff; |
| } |
| |
| static inline void page_kasan_tag_set(struct page *page, u8 tag) { } |
| static inline void page_kasan_tag_reset(struct page *page) { } |
| |
| #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ |
| |
| static inline struct zone *page_zone(const struct page *page) |
| { |
| return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; |
| } |
| |
| static inline pg_data_t *page_pgdat(const struct page *page) |
| { |
| return NODE_DATA(page_to_nid(page)); |
| } |
| |
| #ifdef SECTION_IN_PAGE_FLAGS |
| static inline void set_page_section(struct page *page, unsigned long section) |
| { |
| page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; |
| } |
| |
| static inline unsigned long page_to_section(const struct page *page) |
| { |
| return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; |
| } |
| #endif |
| |
| static inline void set_page_zone(struct page *page, enum zone_type zone) |
| { |
| page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); |
| page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; |
| } |
| |
| static inline void set_page_node(struct page *page, unsigned long node) |
| { |
| page->flags &= ~(NODES_MASK << NODES_PGSHIFT); |
| page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; |
| } |
| |
| static inline void set_page_links(struct page *page, enum zone_type zone, |
| unsigned long node, unsigned long pfn) |
| { |
| set_page_zone(page, zone); |
| set_page_node(page, node); |
| #ifdef SECTION_IN_PAGE_FLAGS |
| set_page_section(page, pfn_to_section_nr(pfn)); |
| #endif |
| } |
| |
| /* |
| * Some inline functions in vmstat.h depend on page_zone() |
| */ |
| #include <linux/vmstat.h> |
| |
| static __always_inline void *lowmem_page_address(const struct page *page) |
| { |
| return page_to_virt(page); |
| } |
| |
| #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |
| #define HASHED_PAGE_VIRTUAL |
| #endif |
| |
| #if defined(WANT_PAGE_VIRTUAL) |
| static inline void *page_address(const struct page *page) |
| { |
| return page->virtual; |
| } |
| static inline void set_page_address(struct page *page, void *address) |
| { |
| page->virtual = address; |
| } |
| #define page_address_init() do { } while(0) |
| #endif |
| |
| #if defined(HASHED_PAGE_VIRTUAL) |
| void *page_address(const struct page *page); |
| void set_page_address(struct page *page, void *virtual); |
| void page_address_init(void); |
| #endif |
| |
| #if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) |
| #define page_address(page) lowmem_page_address(page) |
| #define set_page_address(page, address) do { } while(0) |
| #define page_address_init() do { } while(0) |
| #endif |
| |
| extern void *page_rmapping(struct page *page); |
| extern struct anon_vma *page_anon_vma(struct page *page); |
| extern struct address_space *page_mapping(struct page *page); |
| |
| extern struct address_space *__page_file_mapping(struct page *); |
| |
| static inline |
| struct address_space *page_file_mapping(struct page *page) |
| { |
| if (unlikely(PageSwapCache(page))) |
| return __page_file_mapping(page); |
| |
| return page->mapping; |
| } |
| |
| extern pgoff_t __page_file_index(struct page *page); |
| |
| /* |
| * Return the pagecache index of the passed page. Regular pagecache pages |
| * use ->index whereas swapcache pages use swp_offset(->private) |
| */ |
| static inline pgoff_t page_index(struct page *page) |
| { |
| if (unlikely(PageSwapCache(page))) |
| return __page_file_index(page); |
| return page->index; |
| } |
| |
| bool page_mapped(struct page *page); |
| struct address_space *page_mapping(struct page *page); |
| struct address_space *page_mapping_file(struct page *page); |
| |
| /* |
| * Return true only if the page has been allocated with |
| * ALLOC_NO_WATERMARKS and the low watermark was not |
| * met implying that the system is under some pressure. |
| */ |
| static inline bool page_is_pfmemalloc(const struct page *page) |
| { |
| /* |
| * Page index cannot be this large so this must be |
| * a pfmemalloc page. |
| */ |
| return page->index == -1UL; |
| } |
| |
| /* |
| * Only to be called by the page allocator on a freshly allocated |
| * page. |
| */ |
| static inline void set_page_pfmemalloc(struct page *page) |
| { |
| page->index = -1UL; |
| } |
| |
| static inline void clear_page_pfmemalloc(struct page *page) |
| { |
| page->index = 0; |
| } |
| |
| /* |
| * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. |
| */ |
| extern void pagefault_out_of_memory(void); |
| |
| #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| #define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) |
| |
| /* |
| * Flags passed to show_mem() and show_free_areas() to suppress output in |
| * various contexts. |
| */ |
| #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ |
| |
| extern void show_free_areas(unsigned int flags, nodemask_t *nodemask); |
| |
| #ifdef CONFIG_MMU |
| extern bool can_do_mlock(void); |
| #else |
| static inline bool can_do_mlock(void) { return false; } |
| #endif |
| extern int user_shm_lock(size_t, struct user_struct *); |
| extern void user_shm_unlock(size_t, struct user_struct *); |
| |
| /* |
| * Parameter block passed down to zap_pte_range in exceptional cases. |
| */ |
| struct zap_details { |
| struct address_space *check_mapping; /* Check page->mapping if set */ |
| pgoff_t first_index; /* Lowest page->index to unmap */ |
| pgoff_t last_index; /* Highest page->index to unmap */ |
| }; |
| |
| struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, |
| pte_t pte); |
| struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, |
| pmd_t pmd); |
| |
| void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, |
| unsigned long size); |
| void zap_page_range(struct vm_area_struct *vma, unsigned long address, |
| unsigned long size); |
| void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, |
| unsigned long start, unsigned long end); |
| |
| struct mmu_notifier_range; |
| |
| void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, |
| unsigned long end, unsigned long floor, unsigned long ceiling); |
| int |
| copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma); |
| int follow_invalidate_pte(struct mm_struct *mm, unsigned long address, |
| struct mmu_notifier_range *range, pte_t **ptepp, |
| pmd_t **pmdpp, spinlock_t **ptlp); |
| int follow_pte(struct mm_struct *mm, unsigned long address, |
| pte_t **ptepp, spinlock_t **ptlp); |
| int follow_pfn(struct vm_area_struct *vma, unsigned long address, |
| unsigned long *pfn); |
| int follow_phys(struct vm_area_struct *vma, unsigned long address, |
| unsigned int flags, unsigned long *prot, resource_size_t *phys); |
| int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, |
| void *buf, int len, int write); |
| |
| extern void truncate_pagecache(struct inode *inode, loff_t new); |
| extern void truncate_setsize(struct inode *inode, loff_t newsize); |
| void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to); |
| void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); |
| int truncate_inode_page(struct address_space *mapping, struct page *page); |
| int generic_error_remove_page(struct address_space *mapping, struct page *page); |
| int invalidate_inode_page(struct page *page); |
| |
| #ifdef CONFIG_MMU |
| extern vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
| unsigned long address, unsigned int flags, |
| struct pt_regs *regs); |
| extern int fixup_user_fault(struct mm_struct *mm, |
| unsigned long address, unsigned int fault_flags, |
| bool *unlocked); |
| void unmap_mapping_pages(struct address_space *mapping, |
| pgoff_t start, pgoff_t nr, bool even_cows); |
| void unmap_mapping_range(struct address_space *mapping, |
| loff_t const holebegin, loff_t const holelen, int even_cows); |
| #else |
| static inline vm_fault_t handle_mm_fault(struct vm_area_struct *vma, |
| unsigned long address, unsigned int flags, |
| struct pt_regs *regs) |
| { |
| /* should never happen if there's no MMU */ |
| BUG(); |
| return VM_FAULT_SIGBUS; |
| } |
| static inline int fixup_user_fault(struct mm_struct *mm, unsigned long address, |
| unsigned int fault_flags, bool *unlocked) |
| { |
| /* should never happen if there's no MMU */ |
| BUG(); |
| return -EFAULT; |
| } |
| static inline void unmap_mapping_pages(struct address_space *mapping, |
| pgoff_t start, pgoff_t nr, bool even_cows) { } |
| static inline void unmap_mapping_range(struct address_space *mapping, |
| loff_t const holebegin, loff_t const holelen, int even_cows) { } |
| #endif |
| |
| static inline void unmap_shared_mapping_range(struct address_space *mapping, |
| loff_t const holebegin, loff_t const holelen) |
| { |
| unmap_mapping_range(mapping, holebegin, holelen, 0); |
| } |
| |
| extern int access_process_vm(struct task_struct *tsk, unsigned long addr, |
| void *buf, int len, unsigned int gup_flags); |
| extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
| void *buf, int len, unsigned int gup_flags); |
| extern int __access_remote_vm(struct mm_struct *mm, unsigned long addr, |
| void *buf, int len, unsigned int gup_flags); |
| |
| long get_user_pages_remote(struct mm_struct *mm, |
| unsigned long start, unsigned long nr_pages, |
| unsigned int gup_flags, struct page **pages, |
| struct vm_area_struct **vmas, int *locked); |
| long pin_user_pages_remote(struct mm_struct *mm, |
| unsigned long start, unsigned long nr_pages, |
| unsigned int gup_flags, struct page **pages, |
| struct vm_area_struct **vmas, int *locked); |
| long get_user_pages(unsigned long start, unsigned long nr_pages, |
| unsigned int gup_flags, struct page **pages, |
| struct vm_area_struct **vmas); |
| long pin_user_pages(unsigned long start, unsigned long nr_pages, |
| unsigned int gup_flags, struct page **pages, |
| struct vm_area_struct **vmas); |
| long get_user_pages_locked(unsigned long start, unsigned long nr_pages, |
| unsigned int gup_flags, struct page **pages, int *locked); |
| long pin_user_pages_locked(unsigned long start, unsigned long nr_pages, |
| unsigned int gup_flags, struct page **pages, int *locked); |
| long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
| struct page **pages, unsigned int gup_flags); |
| long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, |
| struct page **pages, unsigned int gup_flags); |
| |
| int get_user_pages_fast(unsigned long start, int nr_pages, |
| unsigned int gup_flags, struct page **pages); |
| int pin_user_pages_fast(unsigned long start, int nr_pages, |
| unsigned int gup_flags, struct page **pages); |
| |
| int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc); |
| int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, |
| struct task_struct *task, bool bypass_rlim); |
| |
| struct kvec; |
| int get_kernel_pages(const struct kvec *iov, int nr_pages, int write, |
| struct page **pages); |
| int get_kernel_page(unsigned long start, int write, struct page **pages); |
| struct page *get_dump_page(unsigned long addr); |
| |
| extern int try_to_release_page(struct page * page, gfp_t gfp_mask); |
| extern void do_invalidatepage(struct page *page, unsigned int offset, |
| unsigned int length); |
| |
| void __set_page_dirty(struct page *, struct address_space *, int warn); |
| int __set_page_dirty_nobuffers(struct page *page); |
| int __set_page_dirty_no_writeback(struct page *page); |
| int redirty_page_for_writepage(struct writeback_control *wbc, |
| struct page *page); |
| void account_page_dirtied(struct page *page, struct address_space *mapping); |
| void account_page_cleaned(struct page *page, struct address_space *mapping, |
| struct bdi_writeback *wb); |
| int set_page_dirty(struct page *page); |
| int set_page_dirty_lock(struct page *page); |
| void __cancel_dirty_page(struct page *page); |
| static inline void cancel_dirty_page(struct page *page) |
| { |
| /* Avoid atomic ops, locking, etc. when not actually needed. */ |
| if (PageDirty(page)) |
| __cancel_dirty_page(page); |
| } |
| int clear_page_dirty_for_io(struct page *page); |
| |
| int get_cmdline(struct task_struct *task, char *buffer, int buflen); |
| |
| extern unsigned long move_page_tables(struct vm_area_struct *vma, |
| unsigned long old_addr, struct vm_area_struct *new_vma, |
| unsigned long new_addr, unsigned long len, |
| bool need_rmap_locks); |
| |
| /* |
| * Flags used by change_protection(). For now we make it a bitmap so |
| * that we can pass in multiple flags just like parameters. However |
| * for now all the callers are only use one of the flags at the same |
| * time. |
| */ |
| /* Whether we should allow dirty bit accounting */ |
| #define MM_CP_DIRTY_ACCT (1UL << 0) |
| /* Whether this protection change is for NUMA hints */ |
| #define MM_CP_PROT_NUMA (1UL << 1) |
| /* Whether this change is for write protecting */ |
| #define MM_CP_UFFD_WP (1UL << 2) /* do wp */ |
| #define MM_CP_UFFD_WP_RESOLVE (1UL << 3) /* Resolve wp */ |
| #define MM_CP_UFFD_WP_ALL (MM_CP_UFFD_WP | \ |
| MM_CP_UFFD_WP_RESOLVE) |
| |
| extern unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end, pgprot_t newprot, |
| unsigned long cp_flags); |
| extern int mprotect_fixup(struct vm_area_struct *vma, |
| struct vm_area_struct **pprev, unsigned long start, |
| unsigned long end, unsigned long newflags); |
| |
| /* |
| * doesn't attempt to fault and will return short. |
| */ |
| int get_user_pages_fast_only(unsigned long start, int nr_pages, |
| unsigned int gup_flags, struct page **pages); |
| int pin_user_pages_fast_only(unsigned long start, int nr_pages, |
| unsigned int gup_flags, struct page **pages); |
| |
| static inline bool get_user_page_fast_only(unsigned long addr, |
| unsigned int gup_flags, struct page **pagep) |
| { |
| return get_user_pages_fast_only(addr, 1, gup_flags, pagep) == 1; |
| } |
| /* |
| * per-process(per-mm_struct) statistics. |
| */ |
| static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) |
| { |
| long val = atomic_long_read(&mm->rss_stat.count[member]); |
| |
| #ifdef SPLIT_RSS_COUNTING |
| /* |
| * counter is updated in asynchronous manner and may go to minus. |
| * But it's never be expected number for users. |
| */ |
| if (val < 0) |
| val = 0; |
| #endif |
| return (unsigned long)val; |
| } |
| |
| void mm_trace_rss_stat(struct mm_struct *mm, int member, long count); |
| |
| static inline void add_mm_counter(struct mm_struct *mm, int member, long value) |
| { |
| long count = atomic_long_add_return(value, &mm->rss_stat.count[member]); |
| |
| mm_trace_rss_stat(mm, member, count); |
| } |
| |
| static inline void inc_mm_counter(struct mm_struct *mm, int member) |
| { |
| long count = atomic_long_inc_return(&mm->rss_stat.count[member]); |
| |
| mm_trace_rss_stat(mm, member, count); |
| } |
| |
| static inline void dec_mm_counter(struct mm_struct *mm, int member) |
| { |
| long count = atomic_long_dec_return(&mm->rss_stat.count[member]); |
| |
| mm_trace_rss_stat(mm, member, count); |
| } |
| |
| /* Optimized variant when page is already known not to be PageAnon */ |
| static inline int mm_counter_file(struct page *page) |
| { |
| if (PageSwapBacked(page)) |
| return MM_SHMEMPAGES; |
| return MM_FILEPAGES; |
| } |
| |
| static inline int mm_counter(struct page *page) |
| { |
| if (PageAnon(page)) |
| return MM_ANONPAGES; |
| return mm_counter_file(page); |
| } |
| |
| static inline unsigned long get_mm_rss(struct mm_struct *mm) |
| { |
| return get_mm_counter(mm, MM_FILEPAGES) + |
| get_mm_counter(mm, MM_ANONPAGES) + |
| get_mm_counter(mm, MM_SHMEMPAGES); |
| } |
| |
| static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) |
| { |
| return max(mm->hiwater_rss, get_mm_rss(mm)); |
| } |
| |
| static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) |
| { |
| return max(mm->hiwater_vm, mm->total_vm); |
| } |
| |
| static inline void update_hiwater_rss(struct mm_struct *mm) |
| { |
| unsigned long _rss = get_mm_rss(mm); |
| |
| if ((mm)->hiwater_rss < _rss) |
| (mm)->hiwater_rss = _rss; |
| } |
| |
| static inline void update_hiwater_vm(struct mm_struct *mm) |
| { |
| if (mm->hiwater_vm < mm->total_vm) |
| mm->hiwater_vm = mm->total_vm; |
| } |
| |
| static inline void reset_mm_hiwater_rss(struct mm_struct *mm) |
| { |
| mm->hiwater_rss = get_mm_rss(mm); |
| } |
| |
| static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, |
| struct mm_struct *mm) |
| { |
| unsigned long hiwater_rss = get_mm_hiwater_rss(mm); |
| |
| if (*maxrss < hiwater_rss) |
| *maxrss = hiwater_rss; |
| } |
| |
| #if defined(SPLIT_RSS_COUNTING) |
| void sync_mm_rss(struct mm_struct *mm); |
| #else |
| static inline void sync_mm_rss(struct mm_struct *mm) |
| { |
| } |
| #endif |
| |
| #ifndef CONFIG_ARCH_HAS_PTE_SPECIAL |
| static inline int pte_special(pte_t pte) |
| { |
| return 0; |
| } |
| |
| static inline pte_t pte_mkspecial(pte_t pte) |
| { |
| return pte; |
| } |
| #endif |
| |
| #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP |
| static inline int pte_devmap(pte_t pte) |
| { |
| return 0; |
| } |
| #endif |
| |
| int vma_wants_writenotify(struct vm_area_struct *vma, pgprot_t vm_page_prot); |
| |
| extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, |
| spinlock_t **ptl); |
| static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, |
| spinlock_t **ptl) |
| { |
| pte_t *ptep; |
| __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); |
| return ptep; |
| } |
| |
| #ifdef __PAGETABLE_P4D_FOLDED |
| static inline int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
| unsigned long address) |
| { |
| return 0; |
| } |
| #else |
| int __p4d_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); |
| #endif |
| |
| #if defined(__PAGETABLE_PUD_FOLDED) || !defined(CONFIG_MMU) |
| static inline int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
| unsigned long address) |
| { |
| return 0; |
| } |
| static inline void mm_inc_nr_puds(struct mm_struct *mm) {} |
| static inline void mm_dec_nr_puds(struct mm_struct *mm) {} |
| |
| #else |
| int __pud_alloc(struct mm_struct *mm, p4d_t *p4d, unsigned long address); |
| |
| static inline void mm_inc_nr_puds(struct mm_struct *mm) |
| { |
| if (mm_pud_folded(mm)) |
| return; |
| atomic_long_add(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
| } |
| |
| static inline void mm_dec_nr_puds(struct mm_struct *mm) |
| { |
| if (mm_pud_folded(mm)) |
| return; |
| atomic_long_sub(PTRS_PER_PUD * sizeof(pud_t), &mm->pgtables_bytes); |
| } |
| #endif |
| |
| #if defined(__PAGETABLE_PMD_FOLDED) || !defined(CONFIG_MMU) |
| static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, |
| unsigned long address) |
| { |
| return 0; |
| } |
| |
| static inline void mm_inc_nr_pmds(struct mm_struct *mm) {} |
| static inline void mm_dec_nr_pmds(struct mm_struct *mm) {} |
| |
| #else |
| int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); |
| |
| static inline void mm_inc_nr_pmds(struct mm_struct *mm) |
| { |
| if (mm_pmd_folded(mm)) |
| return; |
| atomic_long_add(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
| } |
| |
| static inline void mm_dec_nr_pmds(struct mm_struct *mm) |
| { |
| if (mm_pmd_folded(mm)) |
| return; |
| atomic_long_sub(PTRS_PER_PMD * sizeof(pmd_t), &mm->pgtables_bytes); |
| } |
| #endif |
| |
| #ifdef CONFIG_MMU |
| static inline void mm_pgtables_bytes_init(struct mm_struct *mm) |
| { |
| atomic_long_set(&mm->pgtables_bytes, 0); |
| } |
| |
| static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) |
| { |
| return atomic_long_read(&mm->pgtables_bytes); |
| } |
| |
| static inline void mm_inc_nr_ptes(struct mm_struct *mm) |
| { |
| atomic_long_add(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
| } |
| |
| static inline void mm_dec_nr_ptes(struct mm_struct *mm) |
| { |
| atomic_long_sub(PTRS_PER_PTE * sizeof(pte_t), &mm->pgtables_bytes); |
| } |
| #else |
| |
| static inline void mm_pgtables_bytes_init(struct mm_struct *mm) {} |
| static inline unsigned long mm_pgtables_bytes(const struct mm_struct *mm) |
| { |
| return 0; |
| } |
| |
| static inline void mm_inc_nr_ptes(struct mm_struct *mm) {} |
| static inline void mm_dec_nr_ptes(struct mm_struct *mm) {} |
| #endif |
| |
| int __pte_alloc(struct mm_struct *mm, pmd_t *pmd); |
| int __pte_alloc_kernel(pmd_t *pmd); |
| |
| #if defined(CONFIG_MMU) |
| |
| static inline p4d_t *p4d_alloc(struct mm_struct *mm, pgd_t *pgd, |
| unsigned long address) |
| { |
| return (unlikely(pgd_none(*pgd)) && __p4d_alloc(mm, pgd, address)) ? |
| NULL : p4d_offset(pgd, address); |
| } |
| |
| static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d, |
| unsigned long address) |
| { |
| return (unlikely(p4d_none(*p4d)) && __pud_alloc(mm, p4d, address)) ? |
| NULL : pud_offset(p4d, address); |
| } |
| |
| static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) |
| { |
| return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? |
| NULL: pmd_offset(pud, address); |
| } |
| #endif /* CONFIG_MMU */ |
| |
| #if USE_SPLIT_PTE_PTLOCKS |
| #if ALLOC_SPLIT_PTLOCKS |
| void __init ptlock_cache_init(void); |
| extern bool ptlock_alloc(struct page *page); |
| extern void ptlock_free(struct page *page); |
| |
| static inline spinlock_t *ptlock_ptr(struct page *page) |
| { |
| return page->ptl; |
| } |
| #else /* ALLOC_SPLIT_PTLOCKS */ |
| static inline void ptlock_cache_init(void) |
| { |
| } |
| |
| static inline bool ptlock_alloc(struct page *page) |
| { |
| return true; |
| } |
| |
| static inline void ptlock_free(struct page *page) |
| { |
| } |
| |
| static inline spinlock_t *ptlock_ptr(struct page *page) |
| { |
| return &page->ptl; |
| } |
| #endif /* ALLOC_SPLIT_PTLOCKS */ |
| |
| static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| { |
| return ptlock_ptr(pmd_page(*pmd)); |
| } |
| |
| static inline bool ptlock_init(struct page *page) |
| { |
| /* |
| * prep_new_page() initialize page->private (and therefore page->ptl) |
| * with 0. Make sure nobody took it in use in between. |
| * |
| * It can happen if arch try to use slab for page table allocation: |
| * slab code uses page->slab_cache, which share storage with page->ptl. |
| */ |
| VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); |
| if (!ptlock_alloc(page)) |
| return false; |
| spin_lock_init(ptlock_ptr(page)); |
| return true; |
| } |
| |
| #else /* !USE_SPLIT_PTE_PTLOCKS */ |
| /* |
| * We use mm->page_table_lock to guard all pagetable pages of the mm. |
| */ |
| static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| { |
| return &mm->page_table_lock; |
| } |
| static inline void ptlock_cache_init(void) {} |
| static inline bool ptlock_init(struct page *page) { return true; } |
| static inline void ptlock_free(struct page *page) {} |
| #endif /* USE_SPLIT_PTE_PTLOCKS */ |
| |
| static inline void pgtable_init(void) |
| { |
| ptlock_cache_init(); |
| pgtable_cache_init(); |
| } |
| |
| static inline bool pgtable_pte_page_ctor(struct page *page) |
| { |
| if (!ptlock_init(page)) |
| return false; |
| __SetPageTable(page); |
| inc_lruvec_page_state(page, NR_PAGETABLE); |
| return true; |
| } |
| |
| static inline void pgtable_pte_page_dtor(struct page *page) |
| { |
| ptlock_free(page); |
| __ClearPageTable(page); |
| dec_lruvec_page_state(page, NR_PAGETABLE); |
| } |
| |
| #define pte_offset_map_lock(mm, pmd, address, ptlp) \ |
| ({ \ |
| spinlock_t *__ptl = pte_lockptr(mm, pmd); \ |
| pte_t *__pte = pte_offset_map(pmd, address); \ |
| *(ptlp) = __ptl; \ |
| spin_lock(__ptl); \ |
| __pte; \ |
| }) |
| |
| #define pte_unmap_unlock(pte, ptl) do { \ |
| spin_unlock(ptl); \ |
| pte_unmap(pte); \ |
| } while (0) |
| |
| #define pte_alloc(mm, pmd) (unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, pmd)) |
| |
| #define pte_alloc_map(mm, pmd, address) \ |
| (pte_alloc(mm, pmd) ? NULL : pte_offset_map(pmd, address)) |
| |
| #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
| (pte_alloc(mm, pmd) ? \ |
| NULL : pte_offset_map_lock(mm, pmd, address, ptlp)) |
| |
| #define pte_alloc_kernel(pmd, address) \ |
| ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \ |
| NULL: pte_offset_kernel(pmd, address)) |
| |
| #if USE_SPLIT_PMD_PTLOCKS |
| |
| static struct page *pmd_to_page(pmd_t *pmd) |
| { |
| unsigned long mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1); |
| return virt_to_page((void *)((unsigned long) pmd & mask)); |
| } |
| |
| static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| { |
| return ptlock_ptr(pmd_to_page(pmd)); |
| } |
| |
| static inline bool pmd_ptlock_init(struct page *page) |
| { |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| page->pmd_huge_pte = NULL; |
| #endif |
| return ptlock_init(page); |
| } |
| |
| static inline void pmd_ptlock_free(struct page *page) |
| { |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| VM_BUG_ON_PAGE(page->pmd_huge_pte, page); |
| #endif |
| ptlock_free(page); |
| } |
| |
| #define pmd_huge_pte(mm, pmd) (pmd_to_page(pmd)->pmd_huge_pte) |
| |
| #else |
| |
| static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd) |
| { |
| return &mm->page_table_lock; |
| } |
| |
| static inline bool pmd_ptlock_init(struct page *page) { return true; } |
| static inline void pmd_ptlock_free(struct page *page) {} |
| |
| #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte) |
| |
| #endif |
| |
| static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) |
| { |
| spinlock_t *ptl = pmd_lockptr(mm, pmd); |
| spin_lock(ptl); |
| return ptl; |
| } |
| |
| static inline bool pgtable_pmd_page_ctor(struct page *page) |
| { |
| if (!pmd_ptlock_init(page)) |
| return false; |
| __SetPageTable(page); |
| inc_lruvec_page_state(page, NR_PAGETABLE); |
| return true; |
| } |
| |
| static inline void pgtable_pmd_page_dtor(struct page *page) |
| { |
| pmd_ptlock_free(page); |
| __ClearPageTable(page); |
| dec_lruvec_page_state(page, NR_PAGETABLE); |
| } |
| |
| /* |
| * No scalability reason to split PUD locks yet, but follow the same pattern |
| * as the PMD locks to make it easier if we decide to. The VM should not be |
| * considered ready to switch to split PUD locks yet; there may be places |
| * which need to be converted from page_table_lock. |
| */ |
| static inline spinlock_t *pud_lockptr(struct mm_struct *mm, pud_t *pud) |
| { |
| return &mm->page_table_lock; |
| } |
| |
| static inline spinlock_t *pud_lock(struct mm_struct *mm, pud_t *pud) |
| { |
| spinlock_t *ptl = pud_lockptr(mm, pud); |
| |
| spin_lock(ptl); |
| return ptl; |
| } |
| |
| extern void __init pagecache_init(void); |
| extern void __init free_area_init_memoryless_node(int nid); |
| extern void free_initmem(void); |
| |
| /* |
| * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) |
| * into the buddy system. The freed pages will be poisoned with pattern |
| * "poison" if it's within range [0, UCHAR_MAX]. |
| * Return pages freed into the buddy system. |
| */ |
| extern unsigned long free_reserved_area(void *start, void *end, |
| int poison, const char *s); |
| |
| extern void adjust_managed_page_count(struct page *page, long count); |
| extern void mem_init_print_info(const char *str); |
| |
| extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end); |
| |
| /* Free the reserved page into the buddy system, so it gets managed. */ |
| static inline void free_reserved_page(struct page *page) |
| { |
| ClearPageReserved(page); |
| init_page_count(page); |
| __free_page(page); |
| adjust_managed_page_count(page, 1); |
| } |
| #define free_highmem_page(page) free_reserved_page(page) |
| |
| static inline void mark_page_reserved(struct page *page) |
| { |
| SetPageReserved(page); |
| adjust_managed_page_count(page, -1); |
| } |
| |
| /* |
| * Default method to free all the __init memory into the buddy system. |
| * The freed pages will be poisoned with pattern "poison" if it's within |
| * range [0, UCHAR_MAX]. |
| * Return pages freed into the buddy system. |
| */ |
| static inline unsigned long free_initmem_default(int poison) |
| { |
| extern char __init_begin[], __init_end[]; |
| |
| return free_reserved_area(&__init_begin, &__init_end, |
| poison, "unused kernel"); |
| } |
| |
| static inline unsigned long get_num_physpages(void) |
| { |
| int nid; |
| unsigned long phys_pages = 0; |
| |
| for_each_online_node(nid) |
| phys_pages += node_present_pages(nid); |
| |
| return phys_pages; |
| } |
| |
| /* |
| * Using memblock node mappings, an architecture may initialise its |
| * zones, allocate the backing mem_map and account for memory holes in an |
| * architecture independent manner. |
| * |
| * An architecture is expected to register range of page frames backed by |
| * physical memory with memblock_add[_node]() before calling |
| * free_area_init() passing in the PFN each zone ends at. At a basic |
| * usage, an architecture is expected to do something like |
| * |
| * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, |
| * max_highmem_pfn}; |
| * for_each_valid_physical_page_range() |
| * memblock_add_node(base, size, nid) |
| * free_area_init(max_zone_pfns); |
| */ |
| void free_area_init(unsigned long *max_zone_pfn); |
| unsigned long node_map_pfn_alignment(void); |
| unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, |
| unsigned long end_pfn); |
| extern unsigned long absent_pages_in_range(unsigned long start_pfn, |
| unsigned long end_pfn); |
| extern void get_pfn_range_for_nid(unsigned int nid, |
| unsigned long *start_pfn, unsigned long *end_pfn); |
| extern unsigned long find_min_pfn_with_active_regions(void); |
| |
| #ifndef CONFIG_NEED_MULTIPLE_NODES |
| static inline int early_pfn_to_nid(unsigned long pfn) |
| { |
| return 0; |
| } |
| #else |
| /* please see mm/page_alloc.c */ |
| extern int __meminit early_pfn_to_nid(unsigned long pfn); |
| #endif |
| |
| extern void set_dma_reserve(unsigned long new_dma_reserve); |
| extern void memmap_init_range(unsigned long, int, unsigned long, |
| unsigned long, unsigned long, enum meminit_context, |
| struct vmem_altmap *, int migratetype); |
| extern void memmap_init_zone(struct zone *zone); |
| extern void setup_per_zone_wmarks(void); |
| extern int __meminit init_per_zone_wmark_min(void); |
| extern void mem_init(void); |
| extern void __init mmap_init(void); |
| extern void show_mem(unsigned int flags, nodemask_t *nodemask); |
| extern long si_mem_available(void); |
| extern void si_meminfo(struct sysinfo * val); |
| extern void si_meminfo_node(struct sysinfo *val, int nid); |
| #ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES |
| extern unsigned long arch_reserved_kernel_pages(void); |
| #endif |
| |
| extern __printf(3, 4) |
| void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...); |
| |
| extern void setup_per_cpu_pageset(void); |
| |
| /* page_alloc.c */ |
| extern int min_free_kbytes; |
| extern int watermark_boost_factor; |
| extern int watermark_scale_factor; |
| extern bool arch_has_descending_max_zone_pfns(void); |
| |
| /* nommu.c */ |
| extern atomic_long_t mmap_pages_allocated; |
| extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); |
| |
| /* interval_tree.c */ |
| void vma_interval_tree_insert(struct vm_area_struct *node, |
| struct rb_root_cached *root); |
| void vma_interval_tree_insert_after(struct vm_area_struct *node, |
| struct vm_area_struct *prev, |
| struct rb_root_cached *root); |
| void vma_interval_tree_remove(struct vm_area_struct *node, |
| struct rb_root_cached *root); |
| struct vm_area_struct *vma_interval_tree_iter_first(struct rb_root_cached *root, |
| unsigned long start, unsigned long last); |
| struct vm_area_struct *vma_interval_tree_iter_next(struct vm_area_struct *node, |
| unsigned long start, unsigned long last); |
| |
| #define vma_interval_tree_foreach(vma, root, start, last) \ |
| for (vma = vma_interval_tree_iter_first(root, start, last); \ |
| vma; vma = vma_interval_tree_iter_next(vma, start, last)) |
| |
| void anon_vma_interval_tree_insert(struct anon_vma_chain *node, |
| struct rb_root_cached *root); |
| void anon_vma_interval_tree_remove(struct anon_vma_chain *node, |
| struct rb_root_cached *root); |
| struct anon_vma_chain * |
| anon_vma_interval_tree_iter_first(struct rb_root_cached *root, |
| unsigned long start, unsigned long last); |
| struct anon_vma_chain *anon_vma_interval_tree_iter_next( |
| struct anon_vma_chain *node, unsigned long start, unsigned long last); |
| #ifdef CONFIG_DEBUG_VM_RB |
| void anon_vma_interval_tree_verify(struct anon_vma_chain *node); |
| #endif |
| |
| #define anon_vma_interval_tree_foreach(avc, root, start, last) \ |
| for (avc = anon_vma_interval_tree_iter_first(root, start, last); \ |
| avc; avc = anon_vma_interval_tree_iter_next(avc, start, last)) |
| |
| /* mmap.c */ |
| extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); |
| extern int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert, |
| struct vm_area_struct *expand); |
| static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, |
| unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert) |
| { |
| return __vma_adjust(vma, start, end, pgoff, insert, NULL); |
| } |
| extern struct vm_area_struct *vma_merge(struct mm_struct *, |
| struct vm_area_struct *prev, unsigned long addr, unsigned long end, |
| unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, |
| struct mempolicy *, struct vm_userfaultfd_ctx); |
| extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); |
| extern int __split_vma(struct mm_struct *, struct vm_area_struct *, |
| unsigned long addr, int new_below); |
| extern int split_vma(struct mm_struct *, struct vm_area_struct *, |
| unsigned long addr, int new_below); |
| extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); |
| extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, |
| struct rb_node **, struct rb_node *); |
| extern void unlink_file_vma(struct vm_area_struct *); |
| extern struct vm_area_struct *copy_vma(struct vm_area_struct **, |
| unsigned long addr, unsigned long len, pgoff_t pgoff, |
| bool *need_rmap_locks); |
| extern void exit_mmap(struct mm_struct *); |
| |
| static inline int check_data_rlimit(unsigned long rlim, |
| unsigned long new, |
| unsigned long start, |
| unsigned long end_data, |
| unsigned long start_data) |
| { |
| if (rlim < RLIM_INFINITY) { |
| if (((new - start) + (end_data - start_data)) > rlim) |
| return -ENOSPC; |
| } |
| |
| return 0; |
| } |
| |
| extern int mm_take_all_locks(struct mm_struct *mm); |
| extern void mm_drop_all_locks(struct mm_struct *mm); |
| |
| extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); |
| extern struct file *get_mm_exe_file(struct mm_struct *mm); |
| extern struct file *get_task_exe_file(struct task_struct *task); |
| |
| extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages); |
| extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages); |
| |
| extern bool vma_is_special_mapping(const struct vm_area_struct *vma, |
| const struct vm_special_mapping *sm); |
| extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm, |
| unsigned long addr, unsigned long len, |
| unsigned long flags, |
| const struct vm_special_mapping *spec); |
| /* This is an obsolete alternative to _install_special_mapping. */ |
| extern int install_special_mapping(struct mm_struct *mm, |
| unsigned long addr, unsigned long len, |
| unsigned long flags, struct page **pages); |
| |
| unsigned long randomize_stack_top(unsigned long stack_top); |
| |
| extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); |
| |
| extern unsigned long mmap_region(struct file *file, unsigned long addr, |
| unsigned long len, vm_flags_t vm_flags, unsigned long pgoff, |
| struct list_head *uf); |
| extern unsigned long do_mmap(struct file *file, unsigned long addr, |
| unsigned long len, unsigned long prot, unsigned long flags, |
| unsigned long pgoff, unsigned long *populate, struct list_head *uf); |
| extern int __do_munmap(struct mm_struct *, unsigned long, size_t, |
| struct list_head *uf, bool downgrade); |
| extern int do_munmap(struct mm_struct *, unsigned long, size_t, |
| struct list_head *uf); |
| extern int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int behavior); |
| |
| #ifdef CONFIG_MMU |
| extern int __mm_populate(unsigned long addr, unsigned long len, |
| int ignore_errors); |
| static inline void mm_populate(unsigned long addr, unsigned long len) |
| { |
| /* Ignore errors */ |
| (void) __mm_populate(addr, len, 1); |
| } |
| #else |
| static inline void mm_populate(unsigned long addr, unsigned long len) {} |
| #endif |
| |
| /* These take the mm semaphore themselves */ |
| extern int __must_check vm_brk(unsigned long, unsigned long); |
| extern int __must_check vm_brk_flags(unsigned long, unsigned long, unsigned long); |
| extern int vm_munmap(unsigned long, size_t); |
| extern unsigned long __must_check vm_mmap(struct file *, unsigned long, |
| unsigned long, unsigned long, |
| unsigned long, unsigned long); |
| |
| struct vm_unmapped_area_info { |
| #define VM_UNMAPPED_AREA_TOPDOWN 1 |
| unsigned long flags; |
| unsigned long length; |
| unsigned long low_limit; |
| unsigned long high_limit; |
| unsigned long align_mask; |
| unsigned long align_offset; |
| }; |
| |
| extern unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info); |
| |
| /* truncate.c */ |
| extern void truncate_inode_pages(struct address_space *, loff_t); |
| extern void truncate_inode_pages_range(struct address_space *, |
| loff_t lstart, loff_t lend); |
| extern void truncate_inode_pages_final(struct address_space *); |
| |
| /* generic vm_area_ops exported for stackable file systems */ |
| extern vm_fault_t filemap_fault(struct vm_fault *vmf); |
| extern vm_fault_t filemap_map_pages(struct vm_fault *vmf, |
| pgoff_t start_pgoff, pgoff_t end_pgoff); |
| extern vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf); |
| |
| /* mm/page-writeback.c */ |
| int __must_check write_one_page(struct page *page); |
| void task_dirty_inc(struct task_struct *tsk); |
| |
| extern unsigned long stack_guard_gap; |
| /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ |
| extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
| |
| /* CONFIG_STACK_GROWSUP still needs to grow downwards at some places */ |
| extern int expand_downwards(struct vm_area_struct *vma, |
| unsigned long address); |
| #if VM_GROWSUP |
| extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
| #else |
| #define expand_upwards(vma, address) (0) |
| #endif |
| |
| /* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ |
| extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); |
| extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, |
| struct vm_area_struct **pprev); |
| |
| /* Look up the first VMA which intersects the interval start_addr..end_addr-1, |
| NULL if none. Assume start_addr < end_addr. */ |
| static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) |
| { |
| struct vm_area_struct * vma = find_vma(mm,start_addr); |
| |
| if (vma && end_addr <= vma->vm_start) |
| vma = NULL; |
| return vma; |
| } |
| |
| static inline unsigned long vm_start_gap(struct vm_area_struct *vma) |
| { |
| unsigned long vm_start = vma->vm_start; |
| |
| if (vma->vm_flags & VM_GROWSDOWN) { |
| vm_start -= stack_guard_gap; |
| if (vm_start > vma->vm_start) |
| vm_start = 0; |
| } |
| return vm_start; |
| } |
| |
| static inline unsigned long vm_end_gap(struct vm_area_struct *vma) |
| { |
| unsigned long vm_end = vma->vm_end; |
| |
| if (vma->vm_flags & VM_GROWSUP) { |
| vm_end += stack_guard_gap; |
| if (vm_end < vma->vm_end) |
| vm_end = -PAGE_SIZE; |
| } |
| return vm_end; |
| } |
| |
| static inline unsigned long vma_pages(struct vm_area_struct *vma) |
| { |
| return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| } |
| |
| /* Look up the first VMA which exactly match the interval vm_start ... vm_end */ |
| static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, |
| unsigned long vm_start, unsigned long vm_end) |
| { |
| struct vm_area_struct *vma = find_vma(mm, vm_start); |
| |
| if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) |
| vma = NULL; |
| |
| return vma; |
| } |
| |
| static inline bool range_in_vma(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end) |
| { |
| return (vma && vma->vm_start <= start && end <= vma->vm_end); |
| } |
| |
| #ifdef CONFIG_MMU |
| pgprot_t vm_get_page_prot(unsigned long vm_flags); |
| void vma_set_page_prot(struct vm_area_struct *vma); |
| #else |
| static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) |
| { |
| return __pgprot(0); |
| } |
| static inline void vma_set_page_prot(struct vm_area_struct *vma) |
| { |
| vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
| } |
| #endif |
| |
| void vma_set_file(struct vm_area_struct *vma, struct file *file); |
| |
| #ifdef CONFIG_NUMA_BALANCING |
| unsigned long change_prot_numa(struct vm_area_struct *vma, |
| unsigned long start, unsigned long end); |
| #endif |
| |
| struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); |
| int remap_pfn_range(struct vm_area_struct *, unsigned long addr, |
| unsigned long pfn, unsigned long size, pgprot_t); |
| int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); |
| int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr, |
| struct page **pages, unsigned long *num); |
| int vm_map_pages(struct vm_area_struct *vma, struct page **pages, |
| unsigned long num); |
| int vm_map_pages_zero(struct vm_area_struct *vma, struct page **pages, |
| unsigned long num); |
| vm_fault_t vmf_insert_pfn(struct vm_area_struct *vma, unsigned long addr, |
| unsigned long pfn); |
| vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, |
| unsigned long pfn, pgprot_t pgprot); |
| vm_fault_t vmf_insert_mixed(struct vm_area_struct *vma, unsigned long addr, |
| pfn_t pfn); |
| vm_fault_t vmf_insert_mixed_prot(struct vm_area_struct *vma, unsigned long addr, |
| pfn_t pfn, pgprot_t pgprot); |
| vm_fault_t vmf_insert_mixed_mkwrite(struct vm_area_struct *vma, |
| unsigned long addr, pfn_t pfn); |
| int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len); |
| |
| static inline vm_fault_t vmf_insert_page(struct vm_area_struct *vma, |
| unsigned long addr, struct page *page) |
| { |
| int err = vm_insert_page(vma, addr, page); |
| |
| if (err == -ENOMEM) |
| return VM_FAULT_OOM; |
| if (err < 0 && err != -EBUSY) |
| return VM_FAULT_SIGBUS; |
| |
| return VM_FAULT_NOPAGE; |
| } |
| |
| #ifndef io_remap_pfn_range |
| static inline int io_remap_pfn_range(struct vm_area_struct *vma, |
| unsigned long addr, unsigned long pfn, |
| unsigned long size, pgprot_t prot) |
| { |
| return remap_pfn_range(vma, addr, pfn, size, pgprot_decrypted(prot)); |
| } |
| #endif |
| |
| static inline vm_fault_t vmf_error(int err) |
| { |
| if (err == -ENOMEM) |
| return VM_FAULT_OOM; |
| return VM_FAULT_SIGBUS; |
| } |
| |
| struct page *follow_page(struct vm_area_struct *vma, unsigned long address, |
| unsigned int foll_flags); |
| |
| #define FOLL_WRITE 0x01 /* check pte is writable */ |
| #define FOLL_TOUCH 0x02 /* mark page accessed */ |
| #define FOLL_GET 0x04 /* do get_page on page */ |
| #define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ |
| #define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ |
| #define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO |
| * and return without waiting upon it */ |
| #define FOLL_POPULATE 0x40 /* fault in page */ |
| #define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ |
| #define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ |
| #define FOLL_NUMA 0x200 /* force NUMA hinting page fault */ |
| #define FOLL_MIGRATION 0x400 /* wait for page to replace migration entry */ |
| #define FOLL_TRIED 0x800 /* a retry, previous pass started an IO */ |
| #define FOLL_MLOCK 0x1000 /* lock present pages */ |
| #define FOLL_REMOTE 0x2000 /* we are working on non-current tsk/mm */ |
| #define FOLL_COW 0x4000 /* internal GUP flag */ |
| #define FOLL_ANON 0x8000 /* don't do file mappings */ |
| #define FOLL_LONGTERM 0x10000 /* mapping lifetime is indefinite: see below */ |
| #define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */ |
| #define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */ |
| #define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */ |
| |
| /* |
| * FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each |
| * other. Here is what they mean, and how to use them: |
| * |
| * FOLL_LONGTERM indicates that the page will be held for an indefinite time |
| * period _often_ under userspace control. This is in contrast to |
| * iov_iter_get_pages(), whose usages are transient. |
| * |
| * FIXME: For pages which are part of a filesystem, mappings are subject to the |
| * lifetime enforced by the filesystem and we need guarantees that longterm |
| * users like RDMA and V4L2 only establish mappings which coordinate usage with |
| * the filesystem. Ideas for this coordination include revoking the longterm |
| * pin, delaying writeback, bounce buffer page writeback, etc. As FS DAX was |
| * added after the problem with filesystems was found FS DAX VMAs are |
| * specifically failed. Filesystem pages are still subject to bugs and use of |
| * FOLL_LONGTERM should be avoided on those pages. |
| * |
| * FIXME: Also NOTE that FOLL_LONGTERM is not supported in every GUP call. |
| * Currently only get_user_pages() and get_user_pages_fast() support this flag |
| * and calls to get_user_pages_[un]locked are specifically not allowed. This |
| * is due to an incompatibility with the FS DAX check and |
| * FAULT_FLAG_ALLOW_RETRY. |
| * |
| * In the CMA case: long term pins in a CMA region would unnecessarily fragment |
| * that region. And so, CMA attempts to migrate the page before pinning, when |
| * FOLL_LONGTERM is specified. |
| * |
| * FOLL_PIN indicates that a special kind of tracking (not just page->_refcount, |
| * but an additional pin counting system) will be invoked. This is intended for |
| * anything that gets a page reference and then touches page data (for example, |
| * Direct IO). This lets the filesystem know that some non-file-system entity is |
| * potentially changing the pages' data. In contrast to FOLL_GET (whose pages |
| * are released via put_page()), FOLL_PIN pages must be released, ultimately, by |
| * a call to unpin_user_page(). |
| * |
| * FOLL_PIN is similar to FOLL_GET: both of these pin pages. They use different |
| * and separate refcounting mechanisms, however, and that means that each has |
| * its own acquire and release mechanisms: |
| * |
| * FOLL_GET: get_user_pages*() to acquire, and put_page() to release. |
| * |
| * FOLL_PIN: pin_user_pages*() to acquire, and unpin_user_pages to release. |
| * |
| * FOLL_PIN and FOLL_GET are mutually exclusive for a given function call. |
| * (The underlying pages may experience both FOLL_GET-based and FOLL_PIN-based |
| * calls applied to them, and that's perfectly OK. This is a constraint on the |
| * callers, not on the pages.) |
| * |
| * FOLL_PIN should be set internally by the pin_user_pages*() APIs, never |
| * directly by the caller. That's in order to help avoid mismatches when |
| * releasing pages: get_user_pages*() pages must be released via put_page(), |
| * while pin_user_pages*() pages must be released via unpin_user_page(). |
| * |
| * Please see Documentation/core-api/pin_user_pages.rst for more information. |
| */ |
| |
| static inline int vm_fault_to_errno(vm_fault_t vm_fault, int foll_flags) |
| { |
| if (vm_fault & VM_FAULT_OOM) |
| return -ENOMEM; |
| if (vm_fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) |
| return (foll_flags & FOLL_HWPOISON) ? -EHWPOISON : -EFAULT; |
| if (vm_fault & (VM_FAULT_SIGBUS | VM_FAULT_SIGSEGV)) |
| return -EFAULT; |
| return 0; |
| } |
| |
| typedef int (*pte_fn_t)(pte_t *pte, unsigned long addr, void *data); |
| extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, |
| unsigned long size, pte_fn_t fn, void *data); |
| extern int apply_to_existing_page_range(struct mm_struct *mm, |
| unsigned long address, unsigned long size, |
| pte_fn_t fn, void *data); |
| |
| extern void init_mem_debugging_and_hardening(void); |
| #ifdef CONFIG_PAGE_POISONING |
| extern void __kernel_poison_pages(struct page *page, int numpages); |
| extern void __kernel_unpoison_pages(struct page *page, int numpages); |
| extern bool _page_poisoning_enabled_early; |
| DECLARE_STATIC_KEY_FALSE(_page_poisoning_enabled); |
| static inline bool page_poisoning_enabled(void) |
| { |
| return _page_poisoning_enabled_early; |
| } |
| /* |
| * For use in fast paths after init_mem_debugging() has run, or when a |
| * false negative result is not harmful when called too early. |
| */ |
| static inline bool page_poisoning_enabled_static(void) |
| { |
| return static_branch_unlikely(&_page_poisoning_enabled); |
| } |
| static inline void kernel_poison_pages(struct page *page, int numpages) |
| { |
| if (page_poisoning_enabled_static()) |
| __kernel_poison_pages(page, numpages); |
| } |
| static inline void kernel_unpoison_pages(struct page *page, int numpages) |
| { |
| if (page_poisoning_enabled_static()) |
| __kernel_unpoison_pages(page, numpages); |
| } |
| #else |
| static inline bool page_poisoning_enabled(void) { return false; } |
| static inline bool page_poisoning_enabled_static(void) { return false; } |
| static inline void __kernel_poison_pages(struct page *page, int nunmpages) { } |
| static inline void kernel_poison_pages(struct page *page, int numpages) { } |
| static inline void kernel_unpoison_pages(struct page *page, int numpages) { } |
| #endif |
| |
| DECLARE_STATIC_KEY_FALSE(init_on_alloc); |
| static inline bool want_init_on_alloc(gfp_t flags) |
| { |
| if (static_branch_unlikely(&init_on_alloc)) |
| return true; |
| return flags & __GFP_ZERO; |
| } |
| |
| DECLARE_STATIC_KEY_FALSE(init_on_free); |
| static inline bool want_init_on_free(void) |
| { |
| return static_branch_unlikely(&init_on_free); |
| } |
| |
| extern bool _debug_pagealloc_enabled_early; |
| DECLARE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); |
| |
| static inline bool debug_pagealloc_enabled(void) |
| { |
| return IS_ENABLED(CONFIG_DEBUG_PAGEALLOC) && |
| _debug_pagealloc_enabled_early; |
| } |
| |
| /* |
| * For use in fast paths after init_debug_pagealloc() has run, or when a |
| * false negative result is not harmful when called too early. |
| */ |
| static inline bool debug_pagealloc_enabled_static(void) |
| { |
| if (!IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) |
| return false; |
| |
| return static_branch_unlikely(&_debug_pagealloc_enabled); |
| } |
| |
| #ifdef CONFIG_DEBUG_PAGEALLOC |
| /* |
| * To support DEBUG_PAGEALLOC architecture must ensure that |
| * __kernel_map_pages() never fails |
| */ |
| extern void __kernel_map_pages(struct page *page, int numpages, int enable); |
| |
| static inline void debug_pagealloc_map_pages(struct page *page, int numpages) |
| { |
| if (debug_pagealloc_enabled_static()) |
| __kernel_map_pages(page, numpages, 1); |
| } |
| |
| static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) |
| { |
| if (debug_pagealloc_enabled_static()) |
| __kernel_map_pages(page, numpages, 0); |
| } |
| #else /* CONFIG_DEBUG_PAGEALLOC */ |
| static inline void debug_pagealloc_map_pages(struct page *page, int numpages) {} |
| static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) {} |
| #endif /* CONFIG_DEBUG_PAGEALLOC */ |
| |
| #ifdef __HAVE_ARCH_GATE_AREA |
| extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); |
| extern int in_gate_area_no_mm(unsigned long addr); |
| extern int in_gate_area(struct mm_struct *mm, unsigned long addr); |
| #else |
| static inline struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
| { |
| return NULL; |
| } |
| static inline int in_gate_area_no_mm(unsigned long addr) { return 0; } |
| static inline int in_gate_area(struct mm_struct *mm, unsigned long addr) |
| { |
| return 0; |
| } |
| #endif /* __HAVE_ARCH_GATE_AREA */ |
| |
| extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); |
| |
| #ifdef CONFIG_SYSCTL |
| extern int sysctl_drop_caches; |
| int drop_caches_sysctl_handler(struct ctl_table *, int, void *, size_t *, |
| loff_t *); |
| #endif |
| |
| void drop_slab(void); |
| void drop_slab_node(int nid); |
| |
| #ifndef CONFIG_MMU |
| #define randomize_va_space 0 |
| #else |
| extern int randomize_va_space; |
| #endif |
| |
| const char * arch_vma_name(struct vm_area_struct *vma); |
| #ifdef CONFIG_MMU |
| void print_vma_addr(char *prefix, unsigned long rip); |
| #else |
| static inline void print_vma_addr(char *prefix, unsigned long rip) |
| { |
| } |
| #endif |
| |
| void *sparse_buffer_alloc(unsigned long size); |
| struct page * __populate_section_memmap(unsigned long pfn, |
| unsigned long nr_pages, int nid, struct vmem_altmap *altmap); |
| pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); |
| p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); |
| pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); |
| pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); |
| pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node, |
| struct vmem_altmap *altmap); |
| void *vmemmap_alloc_block(unsigned long size, int node); |
| struct vmem_altmap; |
| void *vmemmap_alloc_block_buf(unsigned long size, int node, |
| struct vmem_altmap *altmap); |
| void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); |
| int vmemmap_populate_basepages(unsigned long start, unsigned long end, |
| int node, struct vmem_altmap *altmap); |
| int vmemmap_populate(unsigned long start, unsigned long end, int node, |
| struct vmem_altmap *altmap); |
| void vmemmap_populate_print_last(void); |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| void vmemmap_free(unsigned long start, unsigned long end, |
| struct vmem_altmap *altmap); |
| #endif |
| void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, |
| unsigned long nr_pages); |
| |
| enum mf_flags { |
| MF_COUNT_INCREASED = 1 << 0, |
| MF_ACTION_REQUIRED = 1 << 1, |
| MF_MUST_KILL = 1 << 2, |
| MF_SOFT_OFFLINE = 1 << 3, |
| }; |
| extern int memory_failure(unsigned long pfn, int flags); |
| extern void memory_failure_queue(unsigned long pfn, int flags); |
| extern void memory_failure_queue_kick(int cpu); |
| extern int unpoison_memory(unsigned long pfn); |
| extern int sysctl_memory_failure_early_kill; |
| extern int sysctl_memory_failure_recovery; |
| extern void shake_page(struct page *p, int access); |
| extern atomic_long_t num_poisoned_pages __read_mostly; |
| extern int soft_offline_page(unsigned long pfn, int flags); |
| |
| |
| /* |
| * Error handlers for various types of pages. |
| */ |
| enum mf_result { |
| MF_IGNORED, /* Error: cannot be handled */ |
| MF_FAILED, /* Error: handling failed */ |
| MF_DELAYED, /* Will be handled later */ |
| MF_RECOVERED, /* Successfully recovered */ |
| }; |
| |
| enum mf_action_page_type { |
| MF_MSG_KERNEL, |
| MF_MSG_KERNEL_HIGH_ORDER, |
| MF_MSG_SLAB, |
| MF_MSG_DIFFERENT_COMPOUND, |
| MF_MSG_POISONED_HUGE, |
| MF_MSG_HUGE, |
| MF_MSG_FREE_HUGE, |
| MF_MSG_NON_PMD_HUGE, |
| MF_MSG_UNMAP_FAILED, |
| MF_MSG_DIRTY_SWAPCACHE, |
| MF_MSG_CLEAN_SWAPCACHE, |
| MF_MSG_DIRTY_MLOCKED_LRU, |
| MF_MSG_CLEAN_MLOCKED_LRU, |
| MF_MSG_DIRTY_UNEVICTABLE_LRU, |
| MF_MSG_CLEAN_UNEVICTABLE_LRU, |
| MF_MSG_DIRTY_LRU, |
| MF_MSG_CLEAN_LRU, |
| MF_MSG_TRUNCATED_LRU, |
| MF_MSG_BUDDY, |
| MF_MSG_BUDDY_2ND, |
| MF_MSG_DAX, |
| MF_MSG_UNSPLIT_THP, |
| MF_MSG_UNKNOWN, |
| }; |
| |
| #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) |
| extern void clear_huge_page(struct page *page, |
| unsigned long addr_hint,
|