| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk). |
| * |
| * (C) SGI 2006, Christoph Lameter |
| * Cleaned up and restructured to ease the addition of alternative |
| * implementations of SLAB allocators. |
| * (C) Linux Foundation 2008-2013 |
| * Unified interface for all slab allocators |
| */ |
| |
| #ifndef _LINUX_SLAB_H |
| #define _LINUX_SLAB_H |
| |
| #include <linux/gfp.h> |
| #include <linux/overflow.h> |
| #include <linux/types.h> |
| #include <linux/workqueue.h> |
| #include <linux/percpu-refcount.h> |
| |
| |
| /* |
| * Flags to pass to kmem_cache_create(). |
| * The ones marked DEBUG are only valid if CONFIG_DEBUG_SLAB is set. |
| */ |
| /* DEBUG: Perform (expensive) checks on alloc/free */ |
| #define SLAB_CONSISTENCY_CHECKS ((slab_flags_t __force)0x00000100U) |
| /* DEBUG: Red zone objs in a cache */ |
| #define SLAB_RED_ZONE ((slab_flags_t __force)0x00000400U) |
| /* DEBUG: Poison objects */ |
| #define SLAB_POISON ((slab_flags_t __force)0x00000800U) |
| /* Align objs on cache lines */ |
| #define SLAB_HWCACHE_ALIGN ((slab_flags_t __force)0x00002000U) |
| /* Use GFP_DMA memory */ |
| #define SLAB_CACHE_DMA ((slab_flags_t __force)0x00004000U) |
| /* Use GFP_DMA32 memory */ |
| #define SLAB_CACHE_DMA32 ((slab_flags_t __force)0x00008000U) |
| /* DEBUG: Store the last owner for bug hunting */ |
| #define SLAB_STORE_USER ((slab_flags_t __force)0x00010000U) |
| /* Panic if kmem_cache_create() fails */ |
| #define SLAB_PANIC ((slab_flags_t __force)0x00040000U) |
| /* |
| * SLAB_TYPESAFE_BY_RCU - **WARNING** READ THIS! |
| * |
| * This delays freeing the SLAB page by a grace period, it does _NOT_ |
| * delay object freeing. This means that if you do kmem_cache_free() |
| * that memory location is free to be reused at any time. Thus it may |
| * be possible to see another object there in the same RCU grace period. |
| * |
| * This feature only ensures the memory location backing the object |
| * stays valid, the trick to using this is relying on an independent |
| * object validation pass. Something like: |
| * |
| * rcu_read_lock() |
| * again: |
| * obj = lockless_lookup(key); |
| * if (obj) { |
| * if (!try_get_ref(obj)) // might fail for free objects |
| * goto again; |
| * |
| * if (obj->key != key) { // not the object we expected |
| * put_ref(obj); |
| * goto again; |
| * } |
| * } |
| * rcu_read_unlock(); |
| * |
| * This is useful if we need to approach a kernel structure obliquely, |
| * from its address obtained without the usual locking. We can lock |
| * the structure to stabilize it and check it's still at the given address, |
| * only if we can be sure that the memory has not been meanwhile reused |
| * for some other kind of object (which our subsystem's lock might corrupt). |
| * |
| * rcu_read_lock before reading the address, then rcu_read_unlock after |
| * taking the spinlock within the structure expected at that address. |
| * |
| * Note that SLAB_TYPESAFE_BY_RCU was originally named SLAB_DESTROY_BY_RCU. |
| */ |
| /* Defer freeing slabs to RCU */ |
| #define SLAB_TYPESAFE_BY_RCU ((slab_flags_t __force)0x00080000U) |
| /* Spread some memory over cpuset */ |
| #define SLAB_MEM_SPREAD ((slab_flags_t __force)0x00100000U) |
| /* Trace allocations and frees */ |
| #define SLAB_TRACE ((slab_flags_t __force)0x00200000U) |
| |
| /* Flag to prevent checks on free */ |
| #ifdef CONFIG_DEBUG_OBJECTS |
| # define SLAB_DEBUG_OBJECTS ((slab_flags_t __force)0x00400000U) |
| #else |
| # define SLAB_DEBUG_OBJECTS 0 |
| #endif |
| |
| /* Avoid kmemleak tracing */ |
| #define SLAB_NOLEAKTRACE ((slab_flags_t __force)0x00800000U) |
| |
| /* Fault injection mark */ |
| #ifdef CONFIG_FAILSLAB |
| # define SLAB_FAILSLAB ((slab_flags_t __force)0x02000000U) |
| #else |
| # define SLAB_FAILSLAB 0 |
| #endif |
| /* Account to memcg */ |
| #ifdef CONFIG_MEMCG_KMEM |
| # define SLAB_ACCOUNT ((slab_flags_t __force)0x04000000U) |
| #else |
| # define SLAB_ACCOUNT 0 |
| #endif |
| |
| #ifdef CONFIG_KASAN |
| #define SLAB_KASAN ((slab_flags_t __force)0x08000000U) |
| #else |
| #define SLAB_KASAN 0 |
| #endif |
| |
| /* The following flags affect the page allocator grouping pages by mobility */ |
| /* Objects are reclaimable */ |
| #define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000U) |
| #define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */ |
| |
| /* Slab deactivation flag */ |
| #define SLAB_DEACTIVATED ((slab_flags_t __force)0x10000000U) |
| |
| /* |
| * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests. |
| * |
| * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault. |
| * |
| * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can. |
| * Both make kfree a no-op. |
| */ |
| #define ZERO_SIZE_PTR ((void *)16) |
| |
| #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \ |
| (unsigned long)ZERO_SIZE_PTR) |
| |
| #include <linux/kasan.h> |
| |
| struct mem_cgroup; |
| /* |
| * struct kmem_cache related prototypes |
| */ |
| void __init kmem_cache_init(void); |
| bool slab_is_available(void); |
| |
| extern bool usercopy_fallback; |
| |
| struct kmem_cache *kmem_cache_create(const char *name, unsigned int size, |
| unsigned int align, slab_flags_t flags, |
| void (*ctor)(void *)); |
| struct kmem_cache *kmem_cache_create_usercopy(const char *name, |
| unsigned int size, unsigned int align, |
| slab_flags_t flags, |
| unsigned int useroffset, unsigned int usersize, |
| void (*ctor)(void *)); |
| void kmem_cache_destroy(struct kmem_cache *); |
| int kmem_cache_shrink(struct kmem_cache *); |
| |
| /* |
| * Please use this macro to create slab caches. Simply specify the |
| * name of the structure and maybe some flags that are listed above. |
| * |
| * The alignment of the struct determines object alignment. If you |
| * f.e. add ____cacheline_aligned_in_smp to the struct declaration |
| * then the objects will be properly aligned in SMP configurations. |
| */ |
| #define KMEM_CACHE(__struct, __flags) \ |
| kmem_cache_create(#__struct, sizeof(struct __struct), \ |
| __alignof__(struct __struct), (__flags), NULL) |
| |
| /* |
| * To whitelist a single field for copying to/from usercopy, use this |
| * macro instead for KMEM_CACHE() above. |
| */ |
| #define KMEM_CACHE_USERCOPY(__struct, __flags, __field) \ |
| kmem_cache_create_usercopy(#__struct, \ |
| sizeof(struct __struct), \ |
| __alignof__(struct __struct), (__flags), \ |
| offsetof(struct __struct, __field), \ |
| sizeof_field(struct __struct, __field), NULL) |
| |
| /* |
| * Common kmalloc functions provided by all allocators |
| */ |
| void * __must_check krealloc(const void *, size_t, gfp_t); |
| void kfree(const void *); |
| void kfree_sensitive(const void *); |
| size_t __ksize(const void *); |
| size_t ksize(const void *); |
| bool kmem_valid_obj(void *object); |
| void kmem_dump_obj(void *object); |
| |
| #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR |
| void __check_heap_object(const void *ptr, unsigned long n, struct page *page, |
| bool to_user); |
| #else |
| static inline void __check_heap_object(const void *ptr, unsigned long n, |
| struct page *page, bool to_user) { } |
| #endif |
| |
| /* |
| * Some archs want to perform DMA into kmalloc caches and need a guaranteed |
| * alignment larger than the alignment of a 64-bit integer. |
| * Setting ARCH_KMALLOC_MINALIGN in arch headers allows that. |
| */ |
| #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8 |
| #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN |
| #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN |
| #define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN) |
| #else |
| #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) |
| #endif |
| |
| /* |
| * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment. |
| * Intended for arches that get misalignment faults even for 64 bit integer |
| * aligned buffers. |
| */ |
| #ifndef ARCH_SLAB_MINALIGN |
| #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) |
| #endif |
| |
| /* |
| * kmalloc and friends return ARCH_KMALLOC_MINALIGN aligned |
| * pointers. kmem_cache_alloc and friends return ARCH_SLAB_MINALIGN |
| * aligned pointers. |
| */ |
| #define __assume_kmalloc_alignment __assume_aligned(ARCH_KMALLOC_MINALIGN) |
| #define __assume_slab_alignment __assume_aligned(ARCH_SLAB_MINALIGN) |
| #define __assume_page_alignment __assume_aligned(PAGE_SIZE) |
| |
| /* |
| * Kmalloc array related definitions |
| */ |
| |
| #ifdef CONFIG_SLAB |
| /* |
| * The largest kmalloc size supported by the SLAB allocators is |
| * 32 megabyte (2^25) or the maximum allocatable page order if that is |
| * less than 32 MB. |
| * |
| * WARNING: Its not easy to increase this value since the allocators have |
| * to do various tricks to work around compiler limitations in order to |
| * ensure proper constant folding. |
| */ |
| #define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \ |
| (MAX_ORDER + PAGE_SHIFT - 1) : 25) |
| #define KMALLOC_SHIFT_MAX KMALLOC_SHIFT_HIGH |
| #ifndef KMALLOC_SHIFT_LOW |
| #define KMALLOC_SHIFT_LOW 5 |
| #endif |
| #endif |
| |
| #ifdef CONFIG_SLUB |
| /* |
| * SLUB directly allocates requests fitting in to an order-1 page |
| * (PAGE_SIZE*2). Larger requests are passed to the page allocator. |
| */ |
| #define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 1) |
| #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT - 1) |
| #ifndef KMALLOC_SHIFT_LOW |
| #define KMALLOC_SHIFT_LOW 3 |
| #endif |
| #endif |
| |
| #ifdef CONFIG_SLOB |
| /* |
| * SLOB passes all requests larger than one page to the page allocator. |
| * No kmalloc array is necessary since objects of different sizes can |
| * be allocated from the same page. |
| */ |
| #define KMALLOC_SHIFT_HIGH PAGE_SHIFT |
| #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT - 1) |
| #ifndef KMALLOC_SHIFT_LOW |
| #define KMALLOC_SHIFT_LOW 3 |
| #endif |
| #endif |
| |
| /* Maximum allocatable size */ |
| #define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_MAX) |
| /* Maximum size for which we actually use a slab cache */ |
| #define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLOC_SHIFT_HIGH) |
| /* Maximum order allocatable via the slab allocator */ |
| #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_MAX - PAGE_SHIFT) |
| |
| /* |
| * Kmalloc subsystem. |
| */ |
| #ifndef KMALLOC_MIN_SIZE |
| #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW) |
| #endif |
| |
| /* |
| * This restriction comes from byte sized index implementation. |
| * Page size is normally 2^12 bytes and, in this case, if we want to use |
| * byte sized index which can represent 2^8 entries, the size of the object |
| * should be equal or greater to 2^12 / 2^8 = 2^4 = 16. |
| * If minimum size of kmalloc is less than 16, we use it as minimum object |
| * size and give up to use byte sized index. |
| */ |
| #define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SIZE < 16 ? \ |
| (KMALLOC_MIN_SIZE) : 16) |
| |
| /* |
| * Whenever changing this, take care of that kmalloc_type() and |
| * create_kmalloc_caches() still work as intended. |
| */ |
| enum kmalloc_cache_type { |
| KMALLOC_NORMAL = 0, |
| KMALLOC_RECLAIM, |
| #ifdef CONFIG_ZONE_DMA |
| KMALLOC_DMA, |
| #endif |
| NR_KMALLOC_TYPES |
| }; |
| |
| #ifndef CONFIG_SLOB |
| extern struct kmem_cache * |
| kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1]; |
| |
| static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags) |
| { |
| #ifdef CONFIG_ZONE_DMA |
| /* |
| * The most common case is KMALLOC_NORMAL, so test for it |
| * with a single branch for both flags. |
| */ |
| if (likely((flags & (__GFP_DMA | __GFP_RECLAIMABLE)) == 0)) |
| return KMALLOC_NORMAL; |
| |
| /* |
| * At least one of the flags has to be set. If both are, __GFP_DMA |
| * is more important. |
| */ |
| return flags & __GFP_DMA ? KMALLOC_DMA : KMALLOC_RECLAIM; |
| #else |
| return flags & __GFP_RECLAIMABLE ? KMALLOC_RECLAIM : KMALLOC_NORMAL; |
| #endif |
| } |
| |
| /* |
| * Figure out which kmalloc slab an allocation of a certain size |
| * belongs to. |
| * 0 = zero alloc |
| * 1 = 65 .. 96 bytes |
| * 2 = 129 .. 192 bytes |
| * n = 2^(n-1)+1 .. 2^n |
| */ |
| static __always_inline unsigned int kmalloc_index(size_t size) |
| { |
| if (!size) |
| return 0; |
| |
| if (size <= KMALLOC_MIN_SIZE) |
| return KMALLOC_SHIFT_LOW; |
| |
| if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96) |
| return 1; |
| if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192) |
| return 2; |
| if (size <= 8) return 3; |
| if (size <= 16) return 4; |
| if (size <= 32) return 5; |
| if (size <= 64) return 6; |
| if (size <= 128) return 7; |
| if (size <= 256) return 8; |
| if (size <= 512) return 9; |
| if (size <= 1024) return 10; |
| if (size <= 2 * 1024) return 11; |
| if (size <= 4 * 1024) return 12; |
| if (size <= 8 * 1024) return 13; |
| if (size <= 16 * 1024) return 14; |
| if (size <= 32 * 1024) return 15; |
| if (size <= 64 * 1024) return 16; |
| if (size <= 128 * 1024) return 17; |
| if (size <= 256 * 1024) return 18; |
| if (size <= 512 * 1024) return 19; |
| if (size <= 1024 * 1024) return 20; |
| if (size <= 2 * 1024 * 1024) return 21; |
| if (size <= 4 * 1024 * 1024) return 22; |
| if (size <= 8 * 1024 * 1024) return 23; |
| if (size <= 16 * 1024 * 1024) return 24; |
| if (size <= 32 * 1024 * 1024) return 25; |
| if (size <= 64 * 1024 * 1024) return 26; |
| BUG(); |
| |
| /* Will never be reached. Needed because the compiler may complain */ |
| return -1; |
| } |
| #endif /* !CONFIG_SLOB */ |
| |
| void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __malloc; |
| void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags) __assume_slab_alignment __malloc; |
| void kmem_cache_free(struct kmem_cache *, void *); |
| |
| /* |
| * Bulk allocation and freeing operations. These are accelerated in an |
| * allocator specific way to avoid taking locks repeatedly or building |
| * metadata structures unnecessarily. |
| * |
| * Note that interrupts must be enabled when calling these functions. |
| */ |
| void kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); |
| int kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); |
| |
| /* |
| * Caller must not use kfree_bulk() on memory not originally allocated |
| * by kmalloc(), because the SLOB allocator cannot handle this. |
| */ |
| static __always_inline void kfree_bulk(size_t size, void **p) |
| { |
| kmem_cache_free_bulk(NULL, size, p); |
| } |
| |
| #ifdef CONFIG_NUMA |
| void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment __malloc; |
| void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node) __assume_slab_alignment __malloc; |
| #else |
| static __always_inline void *__kmalloc_node(size_t size, gfp_t flags, int node) |
| { |
| return __kmalloc(size, flags); |
| } |
| |
| static __always_inline void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node) |
| { |
| return kmem_cache_alloc(s, flags); |
| } |
| #endif |
| |
| #ifdef CONFIG_TRACING |
| extern void *kmem_cache_alloc_trace(struct kmem_cache *, gfp_t, size_t) __assume_slab_alignment __malloc; |
| |
| #ifdef CONFIG_NUMA |
| extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, |
| gfp_t gfpflags, |
| int node, size_t size) __assume_slab_alignment __malloc; |
| #else |
| static __always_inline void * |
| kmem_cache_alloc_node_trace(struct kmem_cache *s, |
| gfp_t gfpflags, |
| int node, size_t size) |
| { |
| return kmem_cache_alloc_trace(s, gfpflags, size); |
| } |
| #endif /* CONFIG_NUMA */ |
| |
| #else /* CONFIG_TRACING */ |
| static __always_inline void *kmem_cache_alloc_trace(struct kmem_cache *s, |
| gfp_t flags, size_t size) |
| { |
| void *ret = kmem_cache_alloc(s, flags); |
| |
| ret = kasan_kmalloc(s, ret, size, flags); |
| return ret; |
| } |
| |
| static __always_inline void * |
| kmem_cache_alloc_node_trace(struct kmem_cache *s, |
| gfp_t gfpflags, |
| int node, size_t size) |
| { |
| void *ret = kmem_cache_alloc_node(s, gfpflags, node); |
| |
| ret = kasan_kmalloc(s, ret, size, gfpflags); |
| return ret; |
| } |
| #endif /* CONFIG_TRACING */ |
| |
| extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment __malloc; |
| |
| #ifdef CONFIG_TRACING |
| extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment __malloc; |
| #else |
| static __always_inline void * |
| kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) |
| { |
| return kmalloc_order(size, flags, order); |
| } |
| #endif |
| |
| static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
| { |
| unsigned int order = get_order(size); |
| return kmalloc_order_trace(size, flags, order); |
| } |
| |
| /** |
| * kmalloc - allocate memory |
| * @size: how many bytes of memory are required. |
| * @flags: the type of memory to allocate. |
| * |
| * kmalloc is the normal method of allocating memory |
| * for objects smaller than page size in the kernel. |
| * |
| * The allocated object address is aligned to at least ARCH_KMALLOC_MINALIGN |
| * bytes. For @size of power of two bytes, the alignment is also guaranteed |
| * to be at least to the size. |
| * |
| * The @flags argument may be one of the GFP flags defined at |
| * include/linux/gfp.h and described at |
| * :ref:`Documentation/core-api/mm-api.rst <mm-api-gfp-flags>` |
| * |
| * The recommended usage of the @flags is described at |
| * :ref:`Documentation/core-api/memory-allocation.rst <memory_allocation>` |
| * |
| * Below is a brief outline of the most useful GFP flags |
| * |
| * %GFP_KERNEL |
| * Allocate normal kernel ram. May sleep. |
| * |
| * %GFP_NOWAIT |
| * Allocation will not sleep. |
| * |
| * %GFP_ATOMIC |
| * Allocation will not sleep. May use emergency pools. |
| * |
| * %GFP_HIGHUSER |
| * Allocate memory from high memory on behalf of user. |
| * |
| * Also it is possible to set different flags by OR'ing |
| * in one or more of the following additional @flags: |
| * |
| * %__GFP_HIGH |
| * This allocation has high priority and may use emergency pools. |
| * |
| * %__GFP_NOFAIL |
| * Indicate that this allocation is in no way allowed to fail |
| * (think twice before using). |
| * |
| * %__GFP_NORETRY |
| * If memory is not immediately available, |
| * then give up at once. |
| * |
| * %__GFP_NOWARN |
| * If allocation fails, don't issue any warnings. |
| * |
| * %__GFP_RETRY_MAYFAIL |
| * Try really hard to succeed the allocation but fail |
| * eventually. |
| */ |
| static __always_inline void *kmalloc(size_t size, gfp_t flags) |
| { |
| if (__builtin_constant_p(size)) { |
| #ifndef CONFIG_SLOB |
| unsigned int index; |
| #endif |
| if (size > KMALLOC_MAX_CACHE_SIZE) |
| return kmalloc_large(size, flags); |
| #ifndef CONFIG_SLOB |
| index = kmalloc_index(size); |
| |
| if (!index) |
| return ZERO_SIZE_PTR; |
| |
| return kmem_cache_alloc_trace( |
| kmalloc_caches[kmalloc_type(flags)][index], |
| flags, size); |
| #endif |
| } |
| return __kmalloc(size, flags); |
| } |
| |
| static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
| { |
| #ifndef CONFIG_SLOB |
| if (__builtin_constant_p(size) && |
| size <= KMALLOC_MAX_CACHE_SIZE) { |
| unsigned int i = kmalloc_index(size); |
| |
| if (!i) |
| return ZERO_SIZE_PTR; |
| |
| return kmem_cache_alloc_node_trace( |
| kmalloc_caches[kmalloc_type(flags)][i], |
| flags, node, size); |
| } |
| #endif |
| return __kmalloc_node(size, flags, node); |
| } |
| |
| /** |
| * kmalloc_array - allocate memory for an array. |
| * @n: number of elements. |
| * @size: element size. |
| * @flags: the type of memory to allocate (see kmalloc). |
| */ |
| static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags) |
| { |
| size_t bytes; |
| |
| if (unlikely(check_mul_overflow(n, size, &bytes))) |
| return NULL; |
| if (__builtin_constant_p(n) && __builtin_constant_p(size)) |
| return kmalloc(bytes, flags); |
| return __kmalloc(bytes, flags); |
| } |
| |
| /** |
| * krealloc_array - reallocate memory for an array. |
| * @p: pointer to the memory chunk to reallocate |
| * @new_n: new number of elements to alloc |
| * @new_size: new size of a single member of the array |
| * @flags: the type of memory to allocate (see kmalloc) |
| */ |
| static __must_check inline void * |
| krealloc_array(void *p, size_t new_n, size_t new_size, gfp_t flags) |
| { |
| size_t bytes; |
| |
| if (unlikely(check_mul_overflow(new_n, new_size, &bytes))) |
| return NULL; |
| |
| return krealloc(p, bytes, flags); |
| } |
| |
| /** |
| * kcalloc - allocate memory for an array. The memory is set to zero. |
| * @n: number of elements. |
| * @size: element size. |
| * @flags: the type of memory to allocate (see kmalloc). |
| */ |
| static inline void *kcalloc(size_t n, size_t size, gfp_t flags) |
| { |
| return kmalloc_array(n, size, flags | __GFP_ZERO); |
| } |
| |
| /* |
| * kmalloc_track_caller is a special version of kmalloc that records the |
| * calling function of the routine calling it for slab leak tracking instead |
| * of just the calling function (confusing, eh?). |
| * It's useful when the call to kmalloc comes from a widely-used standard |
| * allocator where we care about the real place the memory allocation |
| * request comes from. |
| */ |
| extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long); |
| #define kmalloc_track_caller(size, flags) \ |
| __kmalloc_track_caller(size, flags, _RET_IP_) |
| |
| static inline void *kmalloc_array_node(size_t n, size_t size, gfp_t flags, |
| int node) |
| { |
| size_t bytes; |
| |
| if (unlikely(check_mul_overflow(n, size, &bytes))) |
| return NULL; |
| if (__builtin_constant_p(n) && __builtin_constant_p(size)) |
| return kmalloc_node(bytes, flags, node); |
| return __kmalloc_node(bytes, flags, node); |
| } |
| |
| static inline void *kcalloc_node(size_t n, size_t size, gfp_t flags, int node) |
| { |
| return kmalloc_array_node(n, size, flags | __GFP_ZERO, node); |
| } |
| |
| |
| #ifdef CONFIG_NUMA |
| extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long); |
| #define kmalloc_node_track_caller(size, flags, node) \ |
| __kmalloc_node_track_caller(size, flags, node, \ |
| _RET_IP_) |
| |
| #else /* CONFIG_NUMA */ |
| |
| #define kmalloc_node_track_caller(size, flags, node) \ |
| kmalloc_track_caller(size, flags) |
| |
| #endif /* CONFIG_NUMA */ |
| |
| /* |
| * Shortcuts |
| */ |
| static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags) |
| { |
| return kmem_cache_alloc(k, flags | __GFP_ZERO); |
| } |
| |
| /** |
| * kzalloc - allocate memory. The memory is set to zero. |
| * @size: how many bytes of memory are required. |
| * @flags: the type of memory to allocate (see kmalloc). |
| */ |
| static inline void *kzalloc(size_t size, gfp_t flags) |
| { |
| return kmalloc(size, flags | __GFP_ZERO); |
| } |
| |
| /** |
| * kzalloc_node - allocate zeroed memory from a particular memory node. |
| * @size: how many bytes of memory are required. |
| * @flags: the type of memory to allocate (see kmalloc). |
| * @node: memory node from which to allocate |
| */ |
| static inline void *kzalloc_node(size_t size, gfp_t flags, int node) |
| { |
| return kmalloc_node(size, flags | __GFP_ZERO, node); |
| } |
| |
| unsigned int kmem_cache_size(struct kmem_cache *s); |
| void __init kmem_cache_init_late(void); |
| |
| #if defined(CONFIG_SMP) && defined(CONFIG_SLAB) |
| int slab_prepare_cpu(unsigned int cpu); |
| int slab_dead_cpu(unsigned int cpu); |
| #else |
| #define slab_prepare_cpu NULL |
| #define slab_dead_cpu NULL |
| #endif |
| |
| #endif /* _LINUX_SLAB_H */ |