1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
21da177e4SLinus Torvalds #ifndef __LINUX_GFP_H
31da177e4SLinus Torvalds #define __LINUX_GFP_H
41da177e4SLinus Torvalds
5cb5a065bSIngo Molnar #include <linux/gfp_types.h>
6cb5a065bSIngo Molnar
71da177e4SLinus Torvalds #include <linux/mmzone.h>
8082edb7bSRusty Russell #include <linux/topology.h>
91da177e4SLinus Torvalds
101da177e4SLinus Torvalds struct vm_area_struct;
111da177e4SLinus Torvalds
12dd56b046SMel Gorman /* Convert GFP flags to their corresponding migrate type */
13e12ba74dSMel Gorman #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
14016c13daSMel Gorman #define GFP_MOVABLE_SHIFT 3
156cb06229SChristoph Lameter
gfp_migratetype(const gfp_t gfp_flags)1601c0bfe0SWei Yang static inline int gfp_migratetype(const gfp_t gfp_flags)
17467c996cSMel Gorman {
18016c13daSMel Gorman VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
19016c13daSMel Gorman BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE);
20016c13daSMel Gorman BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE);
214d86d4f7SPeter Collingbourne BUILD_BUG_ON((___GFP_RECLAIMABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_RECLAIMABLE);
224d86d4f7SPeter Collingbourne BUILD_BUG_ON(((___GFP_MOVABLE | ___GFP_RECLAIMABLE) >>
234d86d4f7SPeter Collingbourne GFP_MOVABLE_SHIFT) != MIGRATE_HIGHATOMIC);
24467c996cSMel Gorman
25467c996cSMel Gorman if (unlikely(page_group_by_mobility_disabled))
26467c996cSMel Gorman return MIGRATE_UNMOVABLE;
27467c996cSMel Gorman
28467c996cSMel Gorman /* Group based on mobility */
29fe573327SVasily Averin return (__force unsigned long)(gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT;
30467c996cSMel Gorman }
31dd56b046SMel Gorman #undef GFP_MOVABLE_MASK
32dd56b046SMel Gorman #undef GFP_MOVABLE_SHIFT
33a2f1b424SAndi Kleen
gfpflags_allow_blocking(const gfp_t gfp_flags)34d0164adcSMel Gorman static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
35d0164adcSMel Gorman {
36543dfb2dSJoshua Clayton return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
37d0164adcSMel Gorman }
38d0164adcSMel Gorman
39b70d94eeSChristoph Lameter #ifdef CONFIG_HIGHMEM
40b70d94eeSChristoph Lameter #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
41b70d94eeSChristoph Lameter #else
42b70d94eeSChristoph Lameter #define OPT_ZONE_HIGHMEM ZONE_NORMAL
43b70d94eeSChristoph Lameter #endif
44b70d94eeSChristoph Lameter
45b70d94eeSChristoph Lameter #ifdef CONFIG_ZONE_DMA
46b70d94eeSChristoph Lameter #define OPT_ZONE_DMA ZONE_DMA
47b70d94eeSChristoph Lameter #else
48b70d94eeSChristoph Lameter #define OPT_ZONE_DMA ZONE_NORMAL
49b70d94eeSChristoph Lameter #endif
50b70d94eeSChristoph Lameter
51b70d94eeSChristoph Lameter #ifdef CONFIG_ZONE_DMA32
52b70d94eeSChristoph Lameter #define OPT_ZONE_DMA32 ZONE_DMA32
53b70d94eeSChristoph Lameter #else
54b70d94eeSChristoph Lameter #define OPT_ZONE_DMA32 ZONE_NORMAL
55b70d94eeSChristoph Lameter #endif
56b70d94eeSChristoph Lameter
57b70d94eeSChristoph Lameter /*
58b70d94eeSChristoph Lameter * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
59ac2e8e40SHao Lee * zone to use given the lowest 4 bits of gfp_t. Entries are GFP_ZONES_SHIFT
60ac2e8e40SHao Lee * bits long and there are 16 of them to cover all possible combinations of
61263ff5d8Smatt mooney * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM.
62b70d94eeSChristoph Lameter *
63b70d94eeSChristoph Lameter * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
64b70d94eeSChristoph Lameter * But GFP_MOVABLE is not only a zone specifier but also an allocation
65b70d94eeSChristoph Lameter * policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
66263ff5d8Smatt mooney * Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1".
67b70d94eeSChristoph Lameter *
68b70d94eeSChristoph Lameter * bit result
69b70d94eeSChristoph Lameter * =================
70b70d94eeSChristoph Lameter * 0x0 => NORMAL
71b70d94eeSChristoph Lameter * 0x1 => DMA or NORMAL
72b70d94eeSChristoph Lameter * 0x2 => HIGHMEM or NORMAL
73b70d94eeSChristoph Lameter * 0x3 => BAD (DMA+HIGHMEM)
744b33b695SHuaisheng Ye * 0x4 => DMA32 or NORMAL
75b70d94eeSChristoph Lameter * 0x5 => BAD (DMA+DMA32)
76b70d94eeSChristoph Lameter * 0x6 => BAD (HIGHMEM+DMA32)
77b70d94eeSChristoph Lameter * 0x7 => BAD (HIGHMEM+DMA32+DMA)
78b70d94eeSChristoph Lameter * 0x8 => NORMAL (MOVABLE+0)
79b70d94eeSChristoph Lameter * 0x9 => DMA or NORMAL (MOVABLE+DMA)
80b70d94eeSChristoph Lameter * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too)
81b70d94eeSChristoph Lameter * 0xb => BAD (MOVABLE+HIGHMEM+DMA)
824b33b695SHuaisheng Ye * 0xc => DMA32 or NORMAL (MOVABLE+DMA32)
83b70d94eeSChristoph Lameter * 0xd => BAD (MOVABLE+DMA32+DMA)
84b70d94eeSChristoph Lameter * 0xe => BAD (MOVABLE+DMA32+HIGHMEM)
85b70d94eeSChristoph Lameter * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
86b70d94eeSChristoph Lameter *
87b11a7b94SDan Williams * GFP_ZONES_SHIFT must be <= 2 on 32 bit platforms.
88b70d94eeSChristoph Lameter */
89b70d94eeSChristoph Lameter
90b11a7b94SDan Williams #if defined(CONFIG_ZONE_DEVICE) && (MAX_NR_ZONES-1) <= 4
91b11a7b94SDan Williams /* ZONE_DEVICE is not a valid GFP zone specifier */
92b11a7b94SDan Williams #define GFP_ZONES_SHIFT 2
93b11a7b94SDan Williams #else
94b11a7b94SDan Williams #define GFP_ZONES_SHIFT ZONES_SHIFT
95b11a7b94SDan Williams #endif
96b11a7b94SDan Williams
97b11a7b94SDan Williams #if 16 * GFP_ZONES_SHIFT > BITS_PER_LONG
98b11a7b94SDan Williams #error GFP_ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
99b70d94eeSChristoph Lameter #endif
100b70d94eeSChristoph Lameter
101b70d94eeSChristoph Lameter #define GFP_ZONE_TABLE ( \
102b11a7b94SDan Williams (ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \
103b11a7b94SDan Williams | (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \
104b11a7b94SDan Williams | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \
105b11a7b94SDan Williams | (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \
106b11a7b94SDan Williams | (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \
107b11a7b94SDan Williams | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \
108b11a7b94SDan Williams | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\
109b11a7b94SDan Williams | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\
110b70d94eeSChristoph Lameter )
111b70d94eeSChristoph Lameter
112b70d94eeSChristoph Lameter /*
113263ff5d8Smatt mooney * GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32
114b70d94eeSChristoph Lameter * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
115b70d94eeSChristoph Lameter * entry starting with bit 0. Bit is set if the combination is not
116b70d94eeSChristoph Lameter * allowed.
117b70d94eeSChristoph Lameter */
118b70d94eeSChristoph Lameter #define GFP_ZONE_BAD ( \
11916b56cf4SNamhyung Kim 1 << (___GFP_DMA | ___GFP_HIGHMEM) \
12016b56cf4SNamhyung Kim | 1 << (___GFP_DMA | ___GFP_DMA32) \
12116b56cf4SNamhyung Kim | 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \
12216b56cf4SNamhyung Kim | 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \
12316b56cf4SNamhyung Kim | 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \
12416b56cf4SNamhyung Kim | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \
12516b56cf4SNamhyung Kim | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \
12616b56cf4SNamhyung Kim | 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \
127b70d94eeSChristoph Lameter )
128b70d94eeSChristoph Lameter
gfp_zone(gfp_t flags)12919655d34SChristoph Lameter static inline enum zone_type gfp_zone(gfp_t flags)
1304e4785bcSChristoph Lameter {
131b70d94eeSChristoph Lameter enum zone_type z;
13216b56cf4SNamhyung Kim int bit = (__force int) (flags & GFP_ZONEMASK);
133b70d94eeSChristoph Lameter
134b11a7b94SDan Williams z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) &
135b11a7b94SDan Williams ((1 << GFP_ZONES_SHIFT) - 1);
13682d4b577SDave Hansen VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
137b70d94eeSChristoph Lameter return z;
1384e4785bcSChristoph Lameter }
1394e4785bcSChristoph Lameter
1401da177e4SLinus Torvalds /*
1411da177e4SLinus Torvalds * There is only one page-allocator function, and two main namespaces to
1421da177e4SLinus Torvalds * it. The alloc_page*() variants return 'struct page *' and as such
1431da177e4SLinus Torvalds * can allocate highmem pages, the *get*page*() variants return
1441da177e4SLinus Torvalds * virtual kernel addresses to the allocated page(s).
1451da177e4SLinus Torvalds */
1461da177e4SLinus Torvalds
gfp_zonelist(gfp_t flags)14754a6eb5cSMel Gorman static inline int gfp_zonelist(gfp_t flags)
14854a6eb5cSMel Gorman {
149c00eb15aSYaowei Bai #ifdef CONFIG_NUMA
150c00eb15aSYaowei Bai if (unlikely(flags & __GFP_THISNODE))
151c00eb15aSYaowei Bai return ZONELIST_NOFALLBACK;
152c00eb15aSYaowei Bai #endif
153c00eb15aSYaowei Bai return ZONELIST_FALLBACK;
15454a6eb5cSMel Gorman }
15554a6eb5cSMel Gorman
1561da177e4SLinus Torvalds /*
1571da177e4SLinus Torvalds * We get the zone list from the current node and the gfp_mask.
158cb152a1aSShijie Luo * This zone list contains a maximum of MAX_NUMNODES*MAX_NR_ZONES zones.
15954a6eb5cSMel Gorman * There are two zonelists per node, one for all zones with memory and
16054a6eb5cSMel Gorman * one containing just zones from the node the zonelist belongs to.
1611da177e4SLinus Torvalds *
162d3c251abSMike Rapoport * For the case of non-NUMA systems the NODE_DATA() gets optimized to
163d3c251abSMike Rapoport * &contig_page_data at compile-time.
1641da177e4SLinus Torvalds */
node_zonelist(int nid,gfp_t flags)1650e88460dSMel Gorman static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
1660e88460dSMel Gorman {
16754a6eb5cSMel Gorman return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
1680e88460dSMel Gorman }
1691da177e4SLinus Torvalds
1701da177e4SLinus Torvalds #ifndef HAVE_ARCH_FREE_PAGE
arch_free_page(struct page * page,int order)1711da177e4SLinus Torvalds static inline void arch_free_page(struct page *page, int order) { }
1721da177e4SLinus Torvalds #endif
173cc102509SNick Piggin #ifndef HAVE_ARCH_ALLOC_PAGE
arch_alloc_page(struct page * page,int order)174cc102509SNick Piggin static inline void arch_alloc_page(struct page *page, int order) { }
175cc102509SNick Piggin #endif
1761da177e4SLinus Torvalds
17784172f4bSMatthew Wilcox (Oracle) struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
17804ec6264SVlastimil Babka nodemask_t *nodemask);
179cc09cb13SMatthew Wilcox (Oracle) struct folio *__folio_alloc(gfp_t gfp, unsigned int order, int preferred_nid,
180cc09cb13SMatthew Wilcox (Oracle) nodemask_t *nodemask);
1811da177e4SLinus Torvalds
182387ba26fSMel Gorman unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
183387ba26fSMel Gorman nodemask_t *nodemask, int nr_pages,
1840f87d9d3SMel Gorman struct list_head *page_list,
1850f87d9d3SMel Gorman struct page **page_array);
186387ba26fSMel Gorman
187c00b6b96SChen Wandun unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp,
188c00b6b96SChen Wandun unsigned long nr_pages,
189c00b6b96SChen Wandun struct page **page_array);
190c00b6b96SChen Wandun
191387ba26fSMel Gorman /* Bulk allocate order-0 pages */
192387ba26fSMel Gorman static inline unsigned long
alloc_pages_bulk_list(gfp_t gfp,unsigned long nr_pages,struct list_head * list)1930f87d9d3SMel Gorman alloc_pages_bulk_list(gfp_t gfp, unsigned long nr_pages, struct list_head *list)
194387ba26fSMel Gorman {
1950f87d9d3SMel Gorman return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, list, NULL);
1960f87d9d3SMel Gorman }
1970f87d9d3SMel Gorman
1980f87d9d3SMel Gorman static inline unsigned long
alloc_pages_bulk_array(gfp_t gfp,unsigned long nr_pages,struct page ** page_array)1990f87d9d3SMel Gorman alloc_pages_bulk_array(gfp_t gfp, unsigned long nr_pages, struct page **page_array)
2000f87d9d3SMel Gorman {
2010f87d9d3SMel Gorman return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, NULL, page_array);
202387ba26fSMel Gorman }
203387ba26fSMel Gorman
204a2afc59fSUladzislau Rezki (Sony) static inline unsigned long
alloc_pages_bulk_array_node(gfp_t gfp,int nid,unsigned long nr_pages,struct page ** page_array)205a2afc59fSUladzislau Rezki (Sony) alloc_pages_bulk_array_node(gfp_t gfp, int nid, unsigned long nr_pages, struct page **page_array)
206a2afc59fSUladzislau Rezki (Sony) {
207a2afc59fSUladzislau Rezki (Sony) if (nid == NUMA_NO_NODE)
208a2afc59fSUladzislau Rezki (Sony) nid = numa_mem_id();
209a2afc59fSUladzislau Rezki (Sony)
210a2afc59fSUladzislau Rezki (Sony) return __alloc_pages_bulk(gfp, nid, NULL, nr_pages, NULL, page_array);
211a2afc59fSUladzislau Rezki (Sony) }
212a2afc59fSUladzislau Rezki (Sony)
warn_if_node_offline(int this_node,gfp_t gfp_mask)213dec1d352SYang Shi static inline void warn_if_node_offline(int this_node, gfp_t gfp_mask)
214dec1d352SYang Shi {
215dec1d352SYang Shi gfp_t warn_gfp = gfp_mask & (__GFP_THISNODE|__GFP_NOWARN);
216dec1d352SYang Shi
217dec1d352SYang Shi if (warn_gfp != (__GFP_THISNODE|__GFP_NOWARN))
218dec1d352SYang Shi return;
219dec1d352SYang Shi
220dec1d352SYang Shi if (node_online(this_node))
221dec1d352SYang Shi return;
222dec1d352SYang Shi
223dec1d352SYang Shi pr_warn("%pGg allocation from offline node %d\n", &gfp_mask, this_node);
224dec1d352SYang Shi dump_stack();
225dec1d352SYang Shi }
226dec1d352SYang Shi
22796db800fSVlastimil Babka /*
22896db800fSVlastimil Babka * Allocate pages, preferring the node given as nid. The node must be valid and
22996db800fSVlastimil Babka * online. For more general interface, see alloc_pages_node().
23096db800fSVlastimil Babka */
23196db800fSVlastimil Babka static inline struct page *
__alloc_pages_node(int nid,gfp_t gfp_mask,unsigned int order)23296db800fSVlastimil Babka __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
23396db800fSVlastimil Babka {
2340bc35a97SVlastimil Babka VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
235dec1d352SYang Shi warn_if_node_offline(nid, gfp_mask);
23696db800fSVlastimil Babka
23784172f4bSMatthew Wilcox (Oracle) return __alloc_pages(gfp_mask, order, nid, NULL);
23896db800fSVlastimil Babka }
23996db800fSVlastimil Babka
240cc09cb13SMatthew Wilcox (Oracle) static inline
__folio_alloc_node(gfp_t gfp,unsigned int order,int nid)241cc09cb13SMatthew Wilcox (Oracle) struct folio *__folio_alloc_node(gfp_t gfp, unsigned int order, int nid)
242cc09cb13SMatthew Wilcox (Oracle) {
243cc09cb13SMatthew Wilcox (Oracle) VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
244dec1d352SYang Shi warn_if_node_offline(nid, gfp);
245cc09cb13SMatthew Wilcox (Oracle)
246cc09cb13SMatthew Wilcox (Oracle) return __folio_alloc(gfp, order, nid, NULL);
247cc09cb13SMatthew Wilcox (Oracle) }
248cc09cb13SMatthew Wilcox (Oracle)
24996db800fSVlastimil Babka /*
25096db800fSVlastimil Babka * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
25182c1fc71SVlastimil Babka * prefer the current CPU's closest node. Otherwise node must be valid and
25282c1fc71SVlastimil Babka * online.
25396db800fSVlastimil Babka */
alloc_pages_node(int nid,gfp_t gfp_mask,unsigned int order)254dd0fc66fSAl Viro static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
2551da177e4SLinus Torvalds unsigned int order)
2561da177e4SLinus Torvalds {
2570bc35a97SVlastimil Babka if (nid == NUMA_NO_NODE)
25882c1fc71SVlastimil Babka nid = numa_mem_id();
259819a6928SAndi Kleen
2600bc35a97SVlastimil Babka return __alloc_pages_node(nid, gfp_mask, order);
2611da177e4SLinus Torvalds }
2621da177e4SLinus Torvalds
2631da177e4SLinus Torvalds #ifdef CONFIG_NUMA
264d7f946d0SMatthew Wilcox (Oracle) struct page *alloc_pages(gfp_t gfp, unsigned int order);
265cc09cb13SMatthew Wilcox (Oracle) struct folio *folio_alloc(gfp_t gfp, unsigned order);
266f584b680SMatthew Wilcox (Oracle) struct folio *vma_alloc_folio(gfp_t gfp, int order, struct vm_area_struct *vma,
267f584b680SMatthew Wilcox (Oracle) unsigned long addr, bool hugepage);
2681da177e4SLinus Torvalds #else
alloc_pages(gfp_t gfp_mask,unsigned int order)26943ee5b6dSChristoph Hellwig static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order)
27043ee5b6dSChristoph Hellwig {
27143ee5b6dSChristoph Hellwig return alloc_pages_node(numa_node_id(), gfp_mask, order);
27243ee5b6dSChristoph Hellwig }
folio_alloc(gfp_t gfp,unsigned int order)273cc09cb13SMatthew Wilcox (Oracle) static inline struct folio *folio_alloc(gfp_t gfp, unsigned int order)
274cc09cb13SMatthew Wilcox (Oracle) {
275cc09cb13SMatthew Wilcox (Oracle) return __folio_alloc_node(gfp, order, numa_node_id());
276cc09cb13SMatthew Wilcox (Oracle) }
277f584b680SMatthew Wilcox (Oracle) #define vma_alloc_folio(gfp, order, vma, addr, hugepage) \
278f584b680SMatthew Wilcox (Oracle) folio_alloc(gfp, order)
2791da177e4SLinus Torvalds #endif
2801da177e4SLinus Torvalds #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
alloc_page_vma(gfp_t gfp,struct vm_area_struct * vma,unsigned long addr)281adf88aa8SMatthew Wilcox (Oracle) static inline struct page *alloc_page_vma(gfp_t gfp,
282adf88aa8SMatthew Wilcox (Oracle) struct vm_area_struct *vma, unsigned long addr)
283adf88aa8SMatthew Wilcox (Oracle) {
284adf88aa8SMatthew Wilcox (Oracle) struct folio *folio = vma_alloc_folio(gfp, 0, vma, addr, false);
285adf88aa8SMatthew Wilcox (Oracle)
286adf88aa8SMatthew Wilcox (Oracle) return &folio->page;
287adf88aa8SMatthew Wilcox (Oracle) }
2881da177e4SLinus Torvalds
289b3c97528SHarvey Harrison extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
290b3c97528SHarvey Harrison extern unsigned long get_zeroed_page(gfp_t gfp_mask);
2911da177e4SLinus Torvalds
292abd58f38SKees Cook void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __alloc_size(1);
2932be0ffe2STimur Tabi void free_pages_exact(void *virt, size_t size);
294595ec197SThibaut Sautereau __meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(2);
2952be0ffe2STimur Tabi
2961da177e4SLinus Torvalds #define __get_free_page(gfp_mask) \
2971da177e4SLinus Torvalds __get_free_pages((gfp_mask), 0)
2981da177e4SLinus Torvalds
2991da177e4SLinus Torvalds #define __get_dma_pages(gfp_mask, order) \
3001da177e4SLinus Torvalds __get_free_pages((gfp_mask) | GFP_DMA, (order))
3011da177e4SLinus Torvalds
302b3c97528SHarvey Harrison extern void __free_pages(struct page *page, unsigned int order);
303b3c97528SHarvey Harrison extern void free_pages(unsigned long addr, unsigned int order);
3041da177e4SLinus Torvalds
305b63ae8caSAlexander Duyck struct page_frag_cache;
3062976db80SAlexander Duyck extern void __page_frag_cache_drain(struct page *page, unsigned int count);
307b358e212SKevin Hao extern void *page_frag_alloc_align(struct page_frag_cache *nc,
308b358e212SKevin Hao unsigned int fragsz, gfp_t gfp_mask,
309b358e212SKevin Hao unsigned int align_mask);
310b358e212SKevin Hao
page_frag_alloc(struct page_frag_cache * nc,unsigned int fragsz,gfp_t gfp_mask)311b358e212SKevin Hao static inline void *page_frag_alloc(struct page_frag_cache *nc,
312b358e212SKevin Hao unsigned int fragsz, gfp_t gfp_mask)
313b358e212SKevin Hao {
314b358e212SKevin Hao return page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u);
315b358e212SKevin Hao }
316b358e212SKevin Hao
3178c2dd3e4SAlexander Duyck extern void page_frag_free(void *addr);
318b63ae8caSAlexander Duyck
3191da177e4SLinus Torvalds #define __free_page(page) __free_pages((page), 0)
3201da177e4SLinus Torvalds #define free_page(addr) free_pages((addr), 0)
3211da177e4SLinus Torvalds
322c4fbed4bSMike Rapoport (IBM) void page_alloc_init_cpuhp(void);
3234037d452SChristoph Lameter void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
32493481ff0SVlastimil Babka void drain_all_pages(struct zone *zone);
32593481ff0SVlastimil Babka void drain_local_pages(struct zone *zone);
3261da177e4SLinus Torvalds
3270e1cc95bSMel Gorman void page_alloc_init_late(void);
3280e1cc95bSMel Gorman
329f90ac398SMel Gorman /*
330f90ac398SMel Gorman * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
331f90ac398SMel Gorman * GFP flags are used before interrupts are enabled. Once interrupts are
332f90ac398SMel Gorman * enabled, it is set to __GFP_BITS_MASK while the system is running. During
333f90ac398SMel Gorman * hibernation, it is used by PM to avoid I/O during memory allocation while
334f90ac398SMel Gorman * devices are suspended.
335f90ac398SMel Gorman */
336dcce284aSBenjamin Herrenschmidt extern gfp_t gfp_allowed_mask;
337dcce284aSBenjamin Herrenschmidt
338c93bdd0eSMel Gorman /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
339c93bdd0eSMel Gorman bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
340c93bdd0eSMel Gorman
gfp_has_io_fs(gfp_t gfp)34107f44ac3SKefeng Wang static inline bool gfp_has_io_fs(gfp_t gfp)
34207f44ac3SKefeng Wang {
34307f44ac3SKefeng Wang return (gfp & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS);
34407f44ac3SKefeng Wang }
345dcce284aSBenjamin Herrenschmidt
34627cd25e3SVlastimil Babka /*
34727cd25e3SVlastimil Babka * Check if the gfp flags allow compaction - GFP_NOIO is a really
34827cd25e3SVlastimil Babka * tricky context because the migration might require IO.
34927cd25e3SVlastimil Babka */
gfp_compaction_allowed(gfp_t gfp_mask)35027cd25e3SVlastimil Babka static inline bool gfp_compaction_allowed(gfp_t gfp_mask)
35127cd25e3SVlastimil Babka {
35227cd25e3SVlastimil Babka return IS_ENABLED(CONFIG_COMPACTION) && (gfp_mask & __GFP_IO);
35327cd25e3SVlastimil Babka }
35427cd25e3SVlastimil Babka
355164cc4feSRik van Riel extern gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma);
356164cc4feSRik van Riel
3578df995f6SAlexandre Ghiti #ifdef CONFIG_CONTIG_ALLOC
358041d3a8cSMichal Nazarewicz /* The below functions must be run on a range from a single zone. */
3590815f3d8SMichal Nazarewicz extern int alloc_contig_range(unsigned long start, unsigned long end,
360ca96b625SLucas Stach unsigned migratetype, gfp_t gfp_mask);
3615e27a2dfSAnshuman Khandual extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
3625e27a2dfSAnshuman Khandual int nid, nodemask_t *nodemask);
363080fe206SVlastimil Babka #endif
36478fa5150SMinchan Kim void free_contig_range(unsigned long pfn, unsigned long nr_pages);
365041d3a8cSMichal Nazarewicz
3661da177e4SLinus Torvalds #endif /* __LINUX_GFP_H */
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