| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_GFP_H |
| #define __LINUX_GFP_H |
| |
| #include <linux/mmdebug.h> |
| #include <linux/mmzone.h> |
| #include <linux/stddef.h> |
| #include <linux/linkage.h> |
| #include <linux/topology.h> |
| |
| /* The typedef is in types.h but we want the documentation here */ |
| #if 0 |
| /** |
| * typedef gfp_t - Memory allocation flags. |
| * |
| * GFP flags are commonly used throughout Linux to indicate how memory |
| * should be allocated. The GFP acronym stands for get_free_pages(), |
| * the underlying memory allocation function. Not every GFP flag is |
| * supported by every function which may allocate memory. Most users |
| * will want to use a plain ``GFP_KERNEL``. |
| */ |
| typedef unsigned int __bitwise gfp_t; |
| #endif |
| |
| struct vm_area_struct; |
| |
| /* |
| * In case of changes, please don't forget to update |
| * include/trace/events/mmflags.h and tools/perf/builtin-kmem.c |
| */ |
| |
| /* Plain integer GFP bitmasks. Do not use this directly. */ |
| #define ___GFP_DMA 0x01u |
| #define ___GFP_HIGHMEM 0x02u |
| #define ___GFP_DMA32 0x04u |
| #define ___GFP_MOVABLE 0x08u |
| #define ___GFP_RECLAIMABLE 0x10u |
| #define ___GFP_HIGH 0x20u |
| #define ___GFP_IO 0x40u |
| #define ___GFP_FS 0x80u |
| #define ___GFP_ZERO 0x100u |
| #define ___GFP_ATOMIC 0x200u |
| #define ___GFP_DIRECT_RECLAIM 0x400u |
| #define ___GFP_KSWAPD_RECLAIM 0x800u |
| #define ___GFP_WRITE 0x1000u |
| #define ___GFP_NOWARN 0x2000u |
| #define ___GFP_RETRY_MAYFAIL 0x4000u |
| #define ___GFP_NOFAIL 0x8000u |
| #define ___GFP_NORETRY 0x10000u |
| #define ___GFP_MEMALLOC 0x20000u |
| #define ___GFP_COMP 0x40000u |
| #define ___GFP_NOMEMALLOC 0x80000u |
| #define ___GFP_HARDWALL 0x100000u |
| #define ___GFP_THISNODE 0x200000u |
| #define ___GFP_ACCOUNT 0x400000u |
| #ifdef CONFIG_LOCKDEP |
| #define ___GFP_NOLOCKDEP 0x800000u |
| #else |
| #define ___GFP_NOLOCKDEP 0 |
| #endif |
| /* If the above are modified, __GFP_BITS_SHIFT may need updating */ |
| |
| /* |
| * Physical address zone modifiers (see linux/mmzone.h - low four bits) |
| * |
| * Do not put any conditional on these. If necessary modify the definitions |
| * without the underscores and use them consistently. The definitions here may |
| * be used in bit comparisons. |
| */ |
| #define __GFP_DMA ((__force gfp_t)___GFP_DMA) |
| #define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) |
| #define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) |
| #define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* ZONE_MOVABLE allowed */ |
| #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
| |
| /** |
| * DOC: Page mobility and placement hints |
| * |
| * Page mobility and placement hints |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * These flags provide hints about how mobile the page is. Pages with similar |
| * mobility are placed within the same pageblocks to minimise problems due |
| * to external fragmentation. |
| * |
| * %__GFP_MOVABLE (also a zone modifier) indicates that the page can be |
| * moved by page migration during memory compaction or can be reclaimed. |
| * |
| * %__GFP_RECLAIMABLE is used for slab allocations that specify |
| * SLAB_RECLAIM_ACCOUNT and whose pages can be freed via shrinkers. |
| * |
| * %__GFP_WRITE indicates the caller intends to dirty the page. Where possible, |
| * these pages will be spread between local zones to avoid all the dirty |
| * pages being in one zone (fair zone allocation policy). |
| * |
| * %__GFP_HARDWALL enforces the cpuset memory allocation policy. |
| * |
| * %__GFP_THISNODE forces the allocation to be satisfied from the requested |
| * node with no fallbacks or placement policy enforcements. |
| * |
| * %__GFP_ACCOUNT causes the allocation to be accounted to kmemcg. |
| */ |
| #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) |
| #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) |
| #define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) |
| #define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE) |
| #define __GFP_ACCOUNT ((__force gfp_t)___GFP_ACCOUNT) |
| |
| /** |
| * DOC: Watermark modifiers |
| * |
| * Watermark modifiers -- controls access to emergency reserves |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * %__GFP_HIGH indicates that the caller is high-priority and that granting |
| * the request is necessary before the system can make forward progress. |
| * For example, creating an IO context to clean pages. |
| * |
| * %__GFP_ATOMIC indicates that the caller cannot reclaim or sleep and is |
| * high priority. Users are typically interrupt handlers. This may be |
| * used in conjunction with %__GFP_HIGH |
| * |
| * %__GFP_MEMALLOC allows access to all memory. This should only be used when |
| * the caller guarantees the allocation will allow more memory to be freed |
| * very shortly e.g. process exiting or swapping. Users either should |
| * be the MM or co-ordinating closely with the VM (e.g. swap over NFS). |
| * Users of this flag have to be extremely careful to not deplete the reserve |
| * completely and implement a throttling mechanism which controls the |
| * consumption of the reserve based on the amount of freed memory. |
| * Usage of a pre-allocated pool (e.g. mempool) should be always considered |
| * before using this flag. |
| * |
| * %__GFP_NOMEMALLOC is used to explicitly forbid access to emergency reserves. |
| * This takes precedence over the %__GFP_MEMALLOC flag if both are set. |
| */ |
| #define __GFP_ATOMIC ((__force gfp_t)___GFP_ATOMIC) |
| #define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) |
| #define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC) |
| #define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) |
| |
| /** |
| * DOC: Reclaim modifiers |
| * |
| * Reclaim modifiers |
| * ~~~~~~~~~~~~~~~~~ |
| * Please note that all the following flags are only applicable to sleepable |
| * allocations (e.g. %GFP_NOWAIT and %GFP_ATOMIC will ignore them). |
| * |
| * %__GFP_IO can start physical IO. |
| * |
| * %__GFP_FS can call down to the low-level FS. Clearing the flag avoids the |
| * allocator recursing into the filesystem which might already be holding |
| * locks. |
| * |
| * %__GFP_DIRECT_RECLAIM indicates that the caller may enter direct reclaim. |
| * This flag can be cleared to avoid unnecessary delays when a fallback |
| * option is available. |
| * |
| * %__GFP_KSWAPD_RECLAIM indicates that the caller wants to wake kswapd when |
| * the low watermark is reached and have it reclaim pages until the high |
| * watermark is reached. A caller may wish to clear this flag when fallback |
| * options are available and the reclaim is likely to disrupt the system. The |
| * canonical example is THP allocation where a fallback is cheap but |
| * reclaim/compaction may cause indirect stalls. |
| * |
| * %__GFP_RECLAIM is shorthand to allow/forbid both direct and kswapd reclaim. |
| * |
| * The default allocator behavior depends on the request size. We have a concept |
| * of so called costly allocations (with order > %PAGE_ALLOC_COSTLY_ORDER). |
| * !costly allocations are too essential to fail so they are implicitly |
| * non-failing by default (with some exceptions like OOM victims might fail so |
| * the caller still has to check for failures) while costly requests try to be |
| * not disruptive and back off even without invoking the OOM killer. |
| * The following three modifiers might be used to override some of these |
| * implicit rules |
| * |
| * %__GFP_NORETRY: The VM implementation will try only very lightweight |
| * memory direct reclaim to get some memory under memory pressure (thus |
| * it can sleep). It will avoid disruptive actions like OOM killer. The |
| * caller must handle the failure which is quite likely to happen under |
| * heavy memory pressure. The flag is suitable when failure can easily be |
| * handled at small cost, such as reduced throughput |
| * |
| * %__GFP_RETRY_MAYFAIL: The VM implementation will retry memory reclaim |
| * procedures that have previously failed if there is some indication |
| * that progress has been made else where. It can wait for other |
| * tasks to attempt high level approaches to freeing memory such as |
| * compaction (which removes fragmentation) and page-out. |
| * There is still a definite limit to the number of retries, but it is |
| * a larger limit than with %__GFP_NORETRY. |
| * Allocations with this flag may fail, but only when there is |
| * genuinely little unused memory. While these allocations do not |
| * directly trigger the OOM killer, their failure indicates that |
| * the system is likely to need to use the OOM killer soon. The |
| * caller must handle failure, but can reasonably do so by failing |
| * a higher-level request, or completing it only in a much less |
| * efficient manner. |
| * If the allocation does fail, and the caller is in a position to |
| * free some non-essential memory, doing so could benefit the system |
| * as a whole. |
| * |
| * %__GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
| * cannot handle allocation failures. The allocation could block |
| * indefinitely but will never return with failure. Testing for |
| * failure is pointless. |
| * New users should be evaluated carefully (and the flag should be |
| * used only when there is no reasonable failure policy) but it is |
| * definitely preferable to use the flag rather than opencode endless |
| * loop around allocator. |
| * Using this flag for costly allocations is _highly_ discouraged. |
| */ |
| #define __GFP_IO ((__force gfp_t)___GFP_IO) |
| #define __GFP_FS ((__force gfp_t)___GFP_FS) |
| #define __GFP_DIRECT_RECLAIM ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */ |
| #define __GFP_KSWAPD_RECLAIM ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */ |
| #define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM)) |
| #define __GFP_RETRY_MAYFAIL ((__force gfp_t)___GFP_RETRY_MAYFAIL) |
| #define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) |
| #define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) |
| |
| /** |
| * DOC: Action modifiers |
| * |
| * Action modifiers |
| * ~~~~~~~~~~~~~~~~ |
| * |
| * %__GFP_NOWARN suppresses allocation failure reports. |
| * |
| * %__GFP_COMP address compound page metadata. |
| * |
| * %__GFP_ZERO returns a zeroed page on success. |
| */ |
| #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) |
| #define __GFP_COMP ((__force gfp_t)___GFP_COMP) |
| #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) |
| |
| /* Disable lockdep for GFP context tracking */ |
| #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP) |
| |
| /* Room for N __GFP_FOO bits */ |
| #define __GFP_BITS_SHIFT (23 + IS_ENABLED(CONFIG_LOCKDEP)) |
| #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
| |
| /** |
| * DOC: Useful GFP flag combinations |
| * |
| * Useful GFP flag combinations |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * Useful GFP flag combinations that are commonly used. It is recommended |
| * that subsystems start with one of these combinations and then set/clear |
| * %__GFP_FOO flags as necessary. |
| * |
| * %GFP_ATOMIC users can not sleep and need the allocation to succeed. A lower |
| * watermark is applied to allow access to "atomic reserves". |
| * The current implementation doesn't support NMI and few other strict |
| * non-preemptive contexts (e.g. raw_spin_lock). The same applies to %GFP_NOWAIT. |
| * |
| * %GFP_KERNEL is typical for kernel-internal allocations. The caller requires |
| * %ZONE_NORMAL or a lower zone for direct access but can direct reclaim. |
| * |
| * %GFP_KERNEL_ACCOUNT is the same as GFP_KERNEL, except the allocation is |
| * accounted to kmemcg. |
| * |
| * %GFP_NOWAIT is for kernel allocations that should not stall for direct |
| * reclaim, start physical IO or use any filesystem callback. |
| * |
| * %GFP_NOIO will use direct reclaim to discard clean pages or slab pages |
| * that do not require the starting of any physical IO. |
| * Please try to avoid using this flag directly and instead use |
| * memalloc_noio_{save,restore} to mark the whole scope which cannot |
| * perform any IO with a short explanation why. All allocation requests |
| * will inherit GFP_NOIO implicitly. |
| * |
| * %GFP_NOFS will use direct reclaim but will not use any filesystem interfaces. |
| * Please try to avoid using this flag directly and instead use |
| * memalloc_nofs_{save,restore} to mark the whole scope which cannot/shouldn't |
| * recurse into the FS layer with a short explanation why. All allocation |
| * requests will inherit GFP_NOFS implicitly. |
| * |
| * %GFP_USER is for userspace allocations that also need to be directly |
| * accessibly by the kernel or hardware. It is typically used by hardware |
| * for buffers that are mapped to userspace (e.g. graphics) that hardware |
| * still must DMA to. cpuset limits are enforced for these allocations. |
| * |
| * %GFP_DMA exists for historical reasons and should be avoided where possible. |
| * The flags indicates that the caller requires that the lowest zone be |
| * used (%ZONE_DMA or 16M on x86-64). Ideally, this would be removed but |
| * it would require careful auditing as some users really require it and |
| * others use the flag to avoid lowmem reserves in %ZONE_DMA and treat the |
| * lowest zone as a type of emergency reserve. |
| * |
| * %GFP_DMA32 is similar to %GFP_DMA except that the caller requires a 32-bit |
| * address. |
| * |
| * %GFP_HIGHUSER is for userspace allocations that may be mapped to userspace, |
| * do not need to be directly accessible by the kernel but that cannot |
| * move once in use. An example may be a hardware allocation that maps |
| * data directly into userspace but has no addressing limitations. |
| * |
| * %GFP_HIGHUSER_MOVABLE is for userspace allocations that the kernel does not |
| * need direct access to but can use kmap() when access is required. They |
| * are expected to be movable via page reclaim or page migration. Typically, |
| * pages on the LRU would also be allocated with %GFP_HIGHUSER_MOVABLE. |
| * |
| * %GFP_TRANSHUGE and %GFP_TRANSHUGE_LIGHT are used for THP allocations. They |
| * are compound allocations that will generally fail quickly if memory is not |
| * available and will not wake kswapd/kcompactd on failure. The _LIGHT |
| * version does not attempt reclaim/compaction at all and is by default used |
| * in page fault path, while the non-light is used by khugepaged. |
| */ |
| #define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM) |
| #define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS) |
| #define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT) |
| #define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM) |
| #define GFP_NOIO (__GFP_RECLAIM) |
| #define GFP_NOFS (__GFP_RECLAIM | __GFP_IO) |
| #define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
| #define GFP_DMA __GFP_DMA |
| #define GFP_DMA32 __GFP_DMA32 |
| #define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM) |
| #define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE) |
| #define GFP_TRANSHUGE_LIGHT ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
| __GFP_NOMEMALLOC | __GFP_NOWARN) & ~__GFP_RECLAIM) |
| #define GFP_TRANSHUGE (GFP_TRANSHUGE_LIGHT | __GFP_DIRECT_RECLAIM) |
| |
| /* Convert GFP flags to their corresponding migrate type */ |
| #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
| #define GFP_MOVABLE_SHIFT 3 |
| |
| static inline int gfp_migratetype(const gfp_t gfp_flags) |
| { |
| VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); |
| BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE); |
| BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE); |
| |
| if (unlikely(page_group_by_mobility_disabled)) |
| return MIGRATE_UNMOVABLE; |
| |
| /* Group based on mobility */ |
| return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT; |
| } |
| #undef GFP_MOVABLE_MASK |
| #undef GFP_MOVABLE_SHIFT |
| |
| static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags) |
| { |
| return !!(gfp_flags & __GFP_DIRECT_RECLAIM); |
| } |
| |
| /** |
| * gfpflags_normal_context - is gfp_flags a normal sleepable context? |
| * @gfp_flags: gfp_flags to test |
| * |
| * Test whether @gfp_flags indicates that the allocation is from the |
| * %current context and allowed to sleep. |
| * |
| * An allocation being allowed to block doesn't mean it owns the %current |
| * context. When direct reclaim path tries to allocate memory, the |
| * allocation context is nested inside whatever %current was doing at the |
| * time of the original allocation. The nested allocation may be allowed |
| * to block but modifying anything %current owns can corrupt the outer |
| * context's expectations. |
| * |
| * %true result from this function indicates that the allocation context |
| * can sleep and use anything that's associated with %current. |
| */ |
| static inline bool gfpflags_normal_context(const gfp_t gfp_flags) |
| { |
| return (gfp_flags & (__GFP_DIRECT_RECLAIM | __GFP_MEMALLOC)) == |
| __GFP_DIRECT_RECLAIM; |
| } |
| |
| #ifdef CONFIG_HIGHMEM |
| #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM |
| #else |
| #define OPT_ZONE_HIGHMEM ZONE_NORMAL |
| #endif |
| |
| #ifdef CONFIG_ZONE_DMA |
| #define OPT_ZONE_DMA ZONE_DMA |
| #else |
| #define OPT_ZONE_DMA ZONE_NORMAL |
| #endif |
| |
| #ifdef CONFIG_ZONE_DMA32 |
| #define OPT_ZONE_DMA32 ZONE_DMA32 |
| #else |
| #define OPT_ZONE_DMA32 ZONE_NORMAL |
| #endif |
| |
| /* |
| * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the |
| * zone to use given the lowest 4 bits of gfp_t. Entries are GFP_ZONES_SHIFT |
| * bits long and there are 16 of them to cover all possible combinations of |
| * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM. |
| * |
| * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. |
| * But GFP_MOVABLE is not only a zone specifier but also an allocation |
| * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. |
| * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1". |
| * |
| * bit result |
| * ================= |
| * 0x0 => NORMAL |
| * 0x1 => DMA or NORMAL |
| * 0x2 => HIGHMEM or NORMAL |
| * 0x3 => BAD (DMA+HIGHMEM) |
| * 0x4 => DMA32 or NORMAL |
| * 0x5 => BAD (DMA+DMA32) |
| * 0x6 => BAD (HIGHMEM+DMA32) |
| * 0x7 => BAD (HIGHMEM+DMA32+DMA) |
| * 0x8 => NORMAL (MOVABLE+0) |
| * 0x9 => DMA or NORMAL (MOVABLE+DMA) |
| * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) |
| * 0xb => BAD (MOVABLE+HIGHMEM+DMA) |
| * 0xc => DMA32 or NORMAL (MOVABLE+DMA32) |
| * 0xd => BAD (MOVABLE+DMA32+DMA) |
| * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) |
| * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) |
| * |
| * GFP_ZONES_SHIFT must be <= 2 on 32 bit platforms. |
| */ |
| |
| #if defined(CONFIG_ZONE_DEVICE) && (MAX_NR_ZONES-1) <= 4 |
| /* ZONE_DEVICE is not a valid GFP zone specifier */ |
| #define GFP_ZONES_SHIFT 2 |
| #else |
| #define GFP_ZONES_SHIFT ZONES_SHIFT |
| #endif |
| |
| #if 16 * GFP_ZONES_SHIFT > BITS_PER_LONG |
| #error GFP_ZONES_SHIFT too large to create GFP_ZONE_TABLE integer |
| #endif |
| |
| #define GFP_ZONE_TABLE ( \ |
| (ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \ |
| | (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \ |
| | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \ |
| | (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \ |
| | (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \ |
| | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \ |
| | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\ |
| | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\ |
| ) |
| |
| /* |
| * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32 |
| * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
| * entry starting with bit 0. Bit is set if the combination is not |
| * allowed. |
| */ |
| #define GFP_ZONE_BAD ( \ |
| 1 << (___GFP_DMA | ___GFP_HIGHMEM) \ |
| | 1 << (___GFP_DMA | ___GFP_DMA32) \ |
| | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \ |
| | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \ |
| | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \ |
| | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \ |
| | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \ |
| | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \ |
| ) |
| |
| static inline enum zone_type gfp_zone(gfp_t flags) |
| { |
| enum zone_type z; |
| int bit = (__force int) (flags & GFP_ZONEMASK); |
| |
| z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) & |
| ((1 << GFP_ZONES_SHIFT) - 1); |
| VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
| return z; |
| } |
| |
| /* |
| * There is only one page-allocator function, and two main namespaces to |
| * it. The alloc_page*() variants return 'struct page *' and as such |
| * can allocate highmem pages, the *get*page*() variants return |
| * virtual kernel addresses to the allocated page(s). |
| */ |
| |
| static inline int gfp_zonelist(gfp_t flags) |
| { |
| #ifdef CONFIG_NUMA |
| if (unlikely(flags & __GFP_THISNODE)) |
| return ZONELIST_NOFALLBACK; |
| #endif |
| return ZONELIST_FALLBACK; |
| } |
| |
| /* |
| * We get the zone list from the current node and the gfp_mask. |
| * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
| * There are two zonelists per node, one for all zones with memory and |
| * one containing just zones from the node the zonelist belongs to. |
| * |
| * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
| * optimized to &contig_page_data at compile-time. |
| */ |
| static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
| { |
| return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
| } |
| |
| #ifndef HAVE_ARCH_FREE_PAGE |
| static inline void arch_free_page(struct page *page, int order) { } |
| #endif |
| #ifndef HAVE_ARCH_ALLOC_PAGE |
| static inline void arch_alloc_page(struct page *page, int order) { } |
| #endif |
| #ifndef HAVE_ARCH_MAKE_PAGE_ACCESSIBLE |
| static inline int arch_make_page_accessible(struct page *page) |
| { |
| return 0; |
| } |
| #endif |
| |
| struct page * |
| __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, |
| nodemask_t *nodemask); |
| |
| static inline struct page * |
| __alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid) |
| { |
| return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL); |
| } |
| |
| /* |
| * Allocate pages, preferring the node given as nid. The node must be valid and |
| * online. For more general interface, see alloc_pages_node(). |
| */ |
| static inline struct page * |
| __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order) |
| { |
| VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); |
| VM_WARN_ON((gfp_mask & __GFP_THISNODE) && !node_online(nid)); |
| |
| return __alloc_pages(gfp_mask, order, nid); |
| } |
| |
| /* |
| * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE, |
| * prefer the current CPU's closest node. Otherwise node must be valid and |
| * online. |
| */ |
| static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
| unsigned int order) |
| { |
| if (nid == NUMA_NO_NODE) |
| nid = numa_mem_id(); |
| |
| return __alloc_pages_node(nid, gfp_mask, order); |
| } |
| |
| #ifdef CONFIG_NUMA |
| extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
| |
| static inline struct page * |
| alloc_pages(gfp_t gfp_mask, unsigned int order) |
| { |
| return alloc_pages_current(gfp_mask, order); |
| } |
| extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order, |
| struct vm_area_struct *vma, unsigned long addr, |
| int node, bool hugepage); |
| #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ |
| alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true) |
| #else |
| static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order) |
| { |
| return alloc_pages_node(numa_node_id(), gfp_mask, order); |
| } |
| #define alloc_pages_vma(gfp_mask, order, vma, addr, node, false)\ |
| alloc_pages(gfp_mask, order) |
| #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ |
| alloc_pages(gfp_mask, order) |
| #endif |
| #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
| #define alloc_page_vma(gfp_mask, vma, addr) \ |
| alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false) |
| |
| extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
| extern unsigned long get_zeroed_page(gfp_t gfp_mask); |
| |
| void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
| void free_pages_exact(void *virt, size_t size); |
| void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); |
| |
| #define __get_free_page(gfp_mask) \ |
| __get_free_pages((gfp_mask), 0) |
| |
| #define __get_dma_pages(gfp_mask, order) \ |
| __get_free_pages((gfp_mask) | GFP_DMA, (order)) |
| |
| extern void __free_pages(struct page *page, unsigned int order); |
| extern void free_pages(unsigned long addr, unsigned int order); |
| |
| struct page_frag_cache; |
| extern void __page_frag_cache_drain(struct page *page, unsigned int count); |
| extern void *page_frag_alloc_align(struct page_frag_cache *nc, |
| unsigned int fragsz, gfp_t gfp_mask, |
| unsigned int align_mask); |
| |
| static inline void *page_frag_alloc(struct page_frag_cache *nc, |
| unsigned int fragsz, gfp_t gfp_mask) |
| { |
| return page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u); |
| } |
| |
| extern void page_frag_free(void *addr); |
| |
| #define __free_page(page) __free_pages((page), 0) |
| #define free_page(addr) free_pages((addr), 0) |
| |
| void page_alloc_init(void); |
| void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
| void drain_all_pages(struct zone *zone); |
| void drain_local_pages(struct zone *zone); |
| |
| void page_alloc_init_late(void); |
| |
| /* |
| * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what |
| * GFP flags are used before interrupts are enabled. Once interrupts are |
| * enabled, it is set to __GFP_BITS_MASK while the system is running. During |
| * hibernation, it is used by PM to avoid I/O during memory allocation while |
| * devices are suspended. |
| */ |
| extern gfp_t gfp_allowed_mask; |
| |
| /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ |
| bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); |
| |
| extern void pm_restrict_gfp_mask(void); |
| extern void pm_restore_gfp_mask(void); |
| |
| extern gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma); |
| |
| #ifdef CONFIG_PM_SLEEP |
| extern bool pm_suspended_storage(void); |
| #else |
| static inline bool pm_suspended_storage(void) |
| { |
| return false; |
| } |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| #ifdef CONFIG_CONTIG_ALLOC |
| /* The below functions must be run on a range from a single zone. */ |
| extern int alloc_contig_range(unsigned long start, unsigned long end, |
| unsigned migratetype, gfp_t gfp_mask); |
| extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask, |
| int nid, nodemask_t *nodemask); |
| #endif |
| void free_contig_range(unsigned long pfn, unsigned int nr_pages); |
| |
| #ifdef CONFIG_CMA |
| /* CMA stuff */ |
| extern void init_cma_reserved_pageblock(struct page *page); |
| #endif |
| |
| #endif /* __LINUX_GFP_H */ |