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- /* 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>
- 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
- #define ___GFP_ZEROTAGS 0x800000u
- #define ___GFP_SKIP_KASAN_POISON 0x1000000u
- #ifdef CONFIG_CMA
- #define ___GFP_CMA 0x2000000u
- #else
- #define ___GFP_CMA 0
- #endif
- #ifdef CONFIG_LOCKDEP
- #ifdef CONFIG_CMA
- #define ___GFP_NOLOCKDEP 0x4000000u
- #else
- #define ___GFP_NOLOCKDEP 0x2000000u
- #endif
- #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_CMA ((__force gfp_t)___GFP_CMA)
- #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.
- *
- * %__GFP_ZEROTAGS returns a page with zeroed memory tags on success, if
- * __GFP_ZERO is set.
- *
- * %__GFP_SKIP_KASAN_POISON returns a page which does not need to be poisoned
- * on deallocation. Typically used for userspace pages. Currently only has an
- * effect in HW tags mode.
- */
- #define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN)
- #define __GFP_COMP ((__force gfp_t)___GFP_COMP)
- #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO)
- #define __GFP_ZEROTAGS ((__force gfp_t)___GFP_ZEROTAGS)
- #define __GFP_SKIP_KASAN_POISON ((__force gfp_t)___GFP_SKIP_KASAN_POISON)
- /* Disable lockdep for GFP context tracking */
- #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
- /* Room for N __GFP_FOO bits */
- #ifdef CONFIG_CMA
- #define __GFP_BITS_SHIFT (26 + IS_ENABLED(CONFIG_LOCKDEP))
- #else
- #define __GFP_BITS_SHIFT (25 + IS_ENABLED(CONFIG_LOCKDEP))
- #endif
- #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 | \
- __GFP_SKIP_KASAN_POISON)
- #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) \
- )
- enum zone_type gfp_zone(gfp_t flags);
- /*
- * 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);
- extern void free_unref_page(struct page *page);
- extern void free_unref_page_list(struct list_head *list);
- struct page_frag_cache;
- extern void __page_frag_cache_drain(struct page *page, unsigned int count);
- extern void *page_frag_alloc(struct page_frag_cache *nc,
- unsigned int fragsz, gfp_t gfp_mask);
- 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);
- #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
- extern unsigned long pfn_max_align_up(unsigned long pfn);
- #define ACR_ERR_ISOLATE (1 << 0)
- #define ACR_ERR_MIGRATE (1 << 1)
- #define ACR_ERR_TEST (1 << 2)
- struct acr_info {
- unsigned long nr_mapped;
- unsigned long nr_migrated;
- unsigned long nr_reclaimed;
- unsigned int err;
- unsigned long failed_pfn;
- };
- /* 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,
- struct acr_info *info);
- 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 */
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