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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * Macros for manipulating and testing page->flags | |
4 | */ | |
5 | ||
6 | #ifndef PAGE_FLAGS_H | |
7 | #define PAGE_FLAGS_H | |
8 | ||
f886ed44 | 9 | #include <linux/types.h> |
187f1882 | 10 | #include <linux/bug.h> |
072bb0aa | 11 | #include <linux/mmdebug.h> |
9223b419 | 12 | #ifndef __GENERATING_BOUNDS_H |
6d777953 | 13 | #include <linux/mm_types.h> |
01fc0ac1 | 14 | #include <generated/bounds.h> |
9223b419 | 15 | #endif /* !__GENERATING_BOUNDS_H */ |
f886ed44 | 16 | |
1da177e4 LT |
17 | /* |
18 | * Various page->flags bits: | |
19 | * | |
20 | * PG_reserved is set for special pages, which can never be swapped out. Some | |
8745808f | 21 | * of them might not even exist... |
1da177e4 | 22 | * |
da6052f7 NP |
23 | * The PG_private bitflag is set on pagecache pages if they contain filesystem |
24 | * specific data (which is normally at page->private). It can be used by | |
25 | * private allocations for its own usage. | |
1da177e4 | 26 | * |
da6052f7 NP |
27 | * During initiation of disk I/O, PG_locked is set. This bit is set before I/O |
28 | * and cleared when writeback _starts_ or when read _completes_. PG_writeback | |
29 | * is set before writeback starts and cleared when it finishes. | |
30 | * | |
31 | * PG_locked also pins a page in pagecache, and blocks truncation of the file | |
32 | * while it is held. | |
33 | * | |
34 | * page_waitqueue(page) is a wait queue of all tasks waiting for the page | |
35 | * to become unlocked. | |
1da177e4 LT |
36 | * |
37 | * PG_uptodate tells whether the page's contents is valid. When a read | |
38 | * completes, the page becomes uptodate, unless a disk I/O error happened. | |
39 | * | |
da6052f7 NP |
40 | * PG_referenced, PG_reclaim are used for page reclaim for anonymous and |
41 | * file-backed pagecache (see mm/vmscan.c). | |
1da177e4 LT |
42 | * |
43 | * PG_error is set to indicate that an I/O error occurred on this page. | |
44 | * | |
45 | * PG_arch_1 is an architecture specific page state bit. The generic code | |
46 | * guarantees that this bit is cleared for a page when it first is entered into | |
47 | * the page cache. | |
48 | * | |
d466f2fc AK |
49 | * PG_hwpoison indicates that a page got corrupted in hardware and contains |
50 | * data with incorrect ECC bits that triggered a machine check. Accessing is | |
51 | * not safe since it may cause another machine check. Don't touch! | |
1da177e4 LT |
52 | */ |
53 | ||
54 | /* | |
55 | * Don't use the *_dontuse flags. Use the macros. Otherwise you'll break | |
91fc8ab3 AW |
56 | * locked- and dirty-page accounting. |
57 | * | |
58 | * The page flags field is split into two parts, the main flags area | |
59 | * which extends from the low bits upwards, and the fields area which | |
60 | * extends from the high bits downwards. | |
61 | * | |
62 | * | FIELD | ... | FLAGS | | |
9223b419 CL |
63 | * N-1 ^ 0 |
64 | * (NR_PAGEFLAGS) | |
91fc8ab3 | 65 | * |
9223b419 CL |
66 | * The fields area is reserved for fields mapping zone, node (for NUMA) and |
67 | * SPARSEMEM section (for variants of SPARSEMEM that require section ids like | |
68 | * SPARSEMEM_EXTREME with !SPARSEMEM_VMEMMAP). | |
1da177e4 | 69 | */ |
e2683181 CL |
70 | enum pageflags { |
71 | PG_locked, /* Page is locked. Don't touch. */ | |
e2683181 CL |
72 | PG_referenced, |
73 | PG_uptodate, | |
74 | PG_dirty, | |
75 | PG_lru, | |
76 | PG_active, | |
1899ad18 | 77 | PG_workingset, |
b91e1302 | 78 | PG_waiters, /* Page has waiters, check its waitqueue. Must be bit #7 and in the same byte as "PG_locked" */ |
1899ad18 | 79 | PG_error, |
e2683181 CL |
80 | PG_slab, |
81 | PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/ | |
e2683181 CL |
82 | PG_arch_1, |
83 | PG_reserved, | |
84 | PG_private, /* If pagecache, has fs-private data */ | |
266cf658 | 85 | PG_private_2, /* If pagecache, has fs aux data */ |
e2683181 | 86 | PG_writeback, /* Page is under writeback */ |
e20b8cca | 87 | PG_head, /* A head page */ |
e2683181 CL |
88 | PG_mappedtodisk, /* Has blocks allocated on-disk */ |
89 | PG_reclaim, /* To be reclaimed asap */ | |
b2e18538 | 90 | PG_swapbacked, /* Page is backed by RAM/swap */ |
894bc310 | 91 | PG_unevictable, /* Page is "unevictable" */ |
af8e3354 | 92 | #ifdef CONFIG_MMU |
b291f000 | 93 | PG_mlocked, /* Page is vma mlocked */ |
894bc310 | 94 | #endif |
46cf98cd | 95 | #ifdef CONFIG_ARCH_USES_PG_UNCACHED |
602c4d11 | 96 | PG_uncached, /* Page has been mapped as uncached */ |
d466f2fc AK |
97 | #endif |
98 | #ifdef CONFIG_MEMORY_FAILURE | |
99 | PG_hwpoison, /* hardware poisoned page. Don't touch */ | |
e9da73d6 | 100 | #endif |
33c3fc71 VD |
101 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT) |
102 | PG_young, | |
103 | PG_idle, | |
f886ed44 | 104 | #endif |
0cad47cf AW |
105 | __NR_PAGEFLAGS, |
106 | ||
107 | /* Filesystems */ | |
108 | PG_checked = PG_owner_priv_1, | |
109 | ||
6326fec1 NP |
110 | /* SwapBacked */ |
111 | PG_swapcache = PG_owner_priv_1, /* Swap page: swp_entry_t in private */ | |
112 | ||
266cf658 DH |
113 | /* Two page bits are conscripted by FS-Cache to maintain local caching |
114 | * state. These bits are set on pages belonging to the netfs's inodes | |
115 | * when those inodes are being locally cached. | |
116 | */ | |
117 | PG_fscache = PG_private_2, /* page backed by cache */ | |
118 | ||
0cad47cf | 119 | /* XEN */ |
d8ac3dd4 | 120 | /* Pinned in Xen as a read-only pagetable page. */ |
0cad47cf | 121 | PG_pinned = PG_owner_priv_1, |
d8ac3dd4 | 122 | /* Pinned as part of domain save (see xen_mm_pin_all()). */ |
0cad47cf | 123 | PG_savepinned = PG_dirty, |
d8ac3dd4 JH |
124 | /* Has a grant mapping of another (foreign) domain's page. */ |
125 | PG_foreign = PG_owner_priv_1, | |
8a38082d | 126 | |
9023cb7e | 127 | /* SLOB */ |
9023cb7e | 128 | PG_slob_free = PG_private, |
53f9263b KS |
129 | |
130 | /* Compound pages. Stored in first tail page's flags */ | |
131 | PG_double_map = PG_private_2, | |
bda807d4 MK |
132 | |
133 | /* non-lru isolated movable page */ | |
134 | PG_isolated = PG_reclaim, | |
e2683181 | 135 | }; |
1da177e4 | 136 | |
9223b419 CL |
137 | #ifndef __GENERATING_BOUNDS_H |
138 | ||
0e6d31a7 KS |
139 | struct page; /* forward declaration */ |
140 | ||
141 | static inline struct page *compound_head(struct page *page) | |
142 | { | |
143 | unsigned long head = READ_ONCE(page->compound_head); | |
144 | ||
145 | if (unlikely(head & 1)) | |
146 | return (struct page *) (head - 1); | |
147 | return page; | |
148 | } | |
149 | ||
4b0f3261 | 150 | static __always_inline int PageTail(struct page *page) |
0e6d31a7 KS |
151 | { |
152 | return READ_ONCE(page->compound_head) & 1; | |
153 | } | |
154 | ||
4b0f3261 | 155 | static __always_inline int PageCompound(struct page *page) |
0e6d31a7 KS |
156 | { |
157 | return test_bit(PG_head, &page->flags) || PageTail(page); | |
158 | } | |
159 | ||
f165b378 PT |
160 | #define PAGE_POISON_PATTERN -1l |
161 | static inline int PagePoisoned(const struct page *page) | |
162 | { | |
163 | return page->flags == PAGE_POISON_PATTERN; | |
164 | } | |
165 | ||
f682a97a AD |
166 | #ifdef CONFIG_DEBUG_VM |
167 | void page_init_poison(struct page *page, size_t size); | |
168 | #else | |
169 | static inline void page_init_poison(struct page *page, size_t size) | |
170 | { | |
171 | } | |
172 | #endif | |
173 | ||
95ad9755 KS |
174 | /* |
175 | * Page flags policies wrt compound pages | |
176 | * | |
f165b378 PT |
177 | * PF_POISONED_CHECK |
178 | * check if this struct page poisoned/uninitialized | |
179 | * | |
95ad9755 KS |
180 | * PF_ANY: |
181 | * the page flag is relevant for small, head and tail pages. | |
182 | * | |
183 | * PF_HEAD: | |
184 | * for compound page all operations related to the page flag applied to | |
185 | * head page. | |
186 | * | |
62906027 NP |
187 | * PF_ONLY_HEAD: |
188 | * for compound page, callers only ever operate on the head page. | |
189 | * | |
95ad9755 KS |
190 | * PF_NO_TAIL: |
191 | * modifications of the page flag must be done on small or head pages, | |
192 | * checks can be done on tail pages too. | |
193 | * | |
194 | * PF_NO_COMPOUND: | |
195 | * the page flag is not relevant for compound pages. | |
196 | */ | |
f165b378 PT |
197 | #define PF_POISONED_CHECK(page) ({ \ |
198 | VM_BUG_ON_PGFLAGS(PagePoisoned(page), page); \ | |
199 | page; }) | |
200 | #define PF_ANY(page, enforce) PF_POISONED_CHECK(page) | |
201 | #define PF_HEAD(page, enforce) PF_POISONED_CHECK(compound_head(page)) | |
62906027 NP |
202 | #define PF_ONLY_HEAD(page, enforce) ({ \ |
203 | VM_BUG_ON_PGFLAGS(PageTail(page), page); \ | |
f165b378 | 204 | PF_POISONED_CHECK(page); }) |
95ad9755 KS |
205 | #define PF_NO_TAIL(page, enforce) ({ \ |
206 | VM_BUG_ON_PGFLAGS(enforce && PageTail(page), page); \ | |
f165b378 | 207 | PF_POISONED_CHECK(compound_head(page)); }) |
822cdd11 | 208 | #define PF_NO_COMPOUND(page, enforce) ({ \ |
95ad9755 | 209 | VM_BUG_ON_PGFLAGS(enforce && PageCompound(page), page); \ |
f165b378 | 210 | PF_POISONED_CHECK(page); }) |
95ad9755 | 211 | |
f94a62e9 CL |
212 | /* |
213 | * Macros to create function definitions for page flags | |
214 | */ | |
95ad9755 | 215 | #define TESTPAGEFLAG(uname, lname, policy) \ |
4b0f3261 | 216 | static __always_inline int Page##uname(struct page *page) \ |
95ad9755 | 217 | { return test_bit(PG_##lname, &policy(page, 0)->flags); } |
f94a62e9 | 218 | |
95ad9755 | 219 | #define SETPAGEFLAG(uname, lname, policy) \ |
4b0f3261 | 220 | static __always_inline void SetPage##uname(struct page *page) \ |
95ad9755 | 221 | { set_bit(PG_##lname, &policy(page, 1)->flags); } |
f94a62e9 | 222 | |
95ad9755 | 223 | #define CLEARPAGEFLAG(uname, lname, policy) \ |
4b0f3261 | 224 | static __always_inline void ClearPage##uname(struct page *page) \ |
95ad9755 | 225 | { clear_bit(PG_##lname, &policy(page, 1)->flags); } |
f94a62e9 | 226 | |
95ad9755 | 227 | #define __SETPAGEFLAG(uname, lname, policy) \ |
4b0f3261 | 228 | static __always_inline void __SetPage##uname(struct page *page) \ |
95ad9755 | 229 | { __set_bit(PG_##lname, &policy(page, 1)->flags); } |
f94a62e9 | 230 | |
95ad9755 | 231 | #define __CLEARPAGEFLAG(uname, lname, policy) \ |
4b0f3261 | 232 | static __always_inline void __ClearPage##uname(struct page *page) \ |
95ad9755 | 233 | { __clear_bit(PG_##lname, &policy(page, 1)->flags); } |
f94a62e9 | 234 | |
95ad9755 | 235 | #define TESTSETFLAG(uname, lname, policy) \ |
4b0f3261 | 236 | static __always_inline int TestSetPage##uname(struct page *page) \ |
95ad9755 | 237 | { return test_and_set_bit(PG_##lname, &policy(page, 1)->flags); } |
f94a62e9 | 238 | |
95ad9755 | 239 | #define TESTCLEARFLAG(uname, lname, policy) \ |
4b0f3261 | 240 | static __always_inline int TestClearPage##uname(struct page *page) \ |
95ad9755 | 241 | { return test_and_clear_bit(PG_##lname, &policy(page, 1)->flags); } |
f94a62e9 | 242 | |
95ad9755 KS |
243 | #define PAGEFLAG(uname, lname, policy) \ |
244 | TESTPAGEFLAG(uname, lname, policy) \ | |
245 | SETPAGEFLAG(uname, lname, policy) \ | |
246 | CLEARPAGEFLAG(uname, lname, policy) | |
f94a62e9 | 247 | |
95ad9755 KS |
248 | #define __PAGEFLAG(uname, lname, policy) \ |
249 | TESTPAGEFLAG(uname, lname, policy) \ | |
250 | __SETPAGEFLAG(uname, lname, policy) \ | |
251 | __CLEARPAGEFLAG(uname, lname, policy) | |
f94a62e9 | 252 | |
95ad9755 KS |
253 | #define TESTSCFLAG(uname, lname, policy) \ |
254 | TESTSETFLAG(uname, lname, policy) \ | |
255 | TESTCLEARFLAG(uname, lname, policy) | |
f94a62e9 | 256 | |
2f3e442c JW |
257 | #define TESTPAGEFLAG_FALSE(uname) \ |
258 | static inline int Page##uname(const struct page *page) { return 0; } | |
259 | ||
8a7a8544 LS |
260 | #define SETPAGEFLAG_NOOP(uname) \ |
261 | static inline void SetPage##uname(struct page *page) { } | |
262 | ||
263 | #define CLEARPAGEFLAG_NOOP(uname) \ | |
264 | static inline void ClearPage##uname(struct page *page) { } | |
265 | ||
266 | #define __CLEARPAGEFLAG_NOOP(uname) \ | |
267 | static inline void __ClearPage##uname(struct page *page) { } | |
268 | ||
2f3e442c JW |
269 | #define TESTSETFLAG_FALSE(uname) \ |
270 | static inline int TestSetPage##uname(struct page *page) { return 0; } | |
271 | ||
8a7a8544 LS |
272 | #define TESTCLEARFLAG_FALSE(uname) \ |
273 | static inline int TestClearPage##uname(struct page *page) { return 0; } | |
274 | ||
2f3e442c JW |
275 | #define PAGEFLAG_FALSE(uname) TESTPAGEFLAG_FALSE(uname) \ |
276 | SETPAGEFLAG_NOOP(uname) CLEARPAGEFLAG_NOOP(uname) | |
277 | ||
278 | #define TESTSCFLAG_FALSE(uname) \ | |
279 | TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname) | |
280 | ||
48c935ad | 281 | __PAGEFLAG(Locked, locked, PF_NO_TAIL) |
62906027 | 282 | PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) __CLEARPAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) |
df8c94d1 | 283 | PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND) |
8cb38fab KS |
284 | PAGEFLAG(Referenced, referenced, PF_HEAD) |
285 | TESTCLEARFLAG(Referenced, referenced, PF_HEAD) | |
286 | __SETPAGEFLAG(Referenced, referenced, PF_HEAD) | |
df8c94d1 KS |
287 | PAGEFLAG(Dirty, dirty, PF_HEAD) TESTSCFLAG(Dirty, dirty, PF_HEAD) |
288 | __CLEARPAGEFLAG(Dirty, dirty, PF_HEAD) | |
8cb38fab KS |
289 | PAGEFLAG(LRU, lru, PF_HEAD) __CLEARPAGEFLAG(LRU, lru, PF_HEAD) |
290 | PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD) | |
291 | TESTCLEARFLAG(Active, active, PF_HEAD) | |
1899ad18 JW |
292 | PAGEFLAG(Workingset, workingset, PF_HEAD) |
293 | TESTCLEARFLAG(Workingset, workingset, PF_HEAD) | |
dcb351cd KS |
294 | __PAGEFLAG(Slab, slab, PF_NO_TAIL) |
295 | __PAGEFLAG(SlobFree, slob_free, PF_NO_TAIL) | |
df8c94d1 | 296 | PAGEFLAG(Checked, checked, PF_NO_COMPOUND) /* Used by some filesystems */ |
c13985fa KS |
297 | |
298 | /* Xen */ | |
299 | PAGEFLAG(Pinned, pinned, PF_NO_COMPOUND) | |
300 | TESTSCFLAG(Pinned, pinned, PF_NO_COMPOUND) | |
301 | PAGEFLAG(SavePinned, savepinned, PF_NO_COMPOUND); | |
302 | PAGEFLAG(Foreign, foreign, PF_NO_COMPOUND); | |
303 | ||
de09d31d KS |
304 | PAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) |
305 | __CLEARPAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) | |
d483da5b | 306 | __SETPAGEFLAG(Reserved, reserved, PF_NO_COMPOUND) |
da5efc40 KS |
307 | PAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL) |
308 | __CLEARPAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL) | |
309 | __SETPAGEFLAG(SwapBacked, swapbacked, PF_NO_TAIL) | |
95ad9755 | 310 | |
266cf658 DH |
311 | /* |
312 | * Private page markings that may be used by the filesystem that owns the page | |
313 | * for its own purposes. | |
314 | * - PG_private and PG_private_2 cause releasepage() and co to be invoked | |
315 | */ | |
95ad9755 KS |
316 | PAGEFLAG(Private, private, PF_ANY) __SETPAGEFLAG(Private, private, PF_ANY) |
317 | __CLEARPAGEFLAG(Private, private, PF_ANY) | |
318 | PAGEFLAG(Private2, private_2, PF_ANY) TESTSCFLAG(Private2, private_2, PF_ANY) | |
319 | PAGEFLAG(OwnerPriv1, owner_priv_1, PF_ANY) | |
320 | TESTCLEARFLAG(OwnerPriv1, owner_priv_1, PF_ANY) | |
266cf658 | 321 | |
6a1e7f77 CL |
322 | /* |
323 | * Only test-and-set exist for PG_writeback. The unconditional operators are | |
324 | * risky: they bypass page accounting. | |
325 | */ | |
225311a4 HY |
326 | TESTPAGEFLAG(Writeback, writeback, PF_NO_TAIL) |
327 | TESTSCFLAG(Writeback, writeback, PF_NO_TAIL) | |
e2f0a0db | 328 | PAGEFLAG(MappedToDisk, mappedtodisk, PF_NO_TAIL) |
6a1e7f77 | 329 | |
579f8290 | 330 | /* PG_readahead is only used for reads; PG_reclaim is only for writes */ |
e2f0a0db KS |
331 | PAGEFLAG(Reclaim, reclaim, PF_NO_TAIL) |
332 | TESTCLEARFLAG(Reclaim, reclaim, PF_NO_TAIL) | |
df8c94d1 KS |
333 | PAGEFLAG(Readahead, reclaim, PF_NO_COMPOUND) |
334 | TESTCLEARFLAG(Readahead, reclaim, PF_NO_COMPOUND) | |
6a1e7f77 CL |
335 | |
336 | #ifdef CONFIG_HIGHMEM | |
1da177e4 | 337 | /* |
6a1e7f77 CL |
338 | * Must use a macro here due to header dependency issues. page_zone() is not |
339 | * available at this point. | |
1da177e4 | 340 | */ |
3ca65c19 | 341 | #define PageHighMem(__p) is_highmem_idx(page_zonenum(__p)) |
6a1e7f77 | 342 | #else |
ec7cade8 | 343 | PAGEFLAG_FALSE(HighMem) |
6a1e7f77 CL |
344 | #endif |
345 | ||
346 | #ifdef CONFIG_SWAP | |
6326fec1 NP |
347 | static __always_inline int PageSwapCache(struct page *page) |
348 | { | |
38d8b4e6 HY |
349 | #ifdef CONFIG_THP_SWAP |
350 | page = compound_head(page); | |
351 | #endif | |
6326fec1 NP |
352 | return PageSwapBacked(page) && test_bit(PG_swapcache, &page->flags); |
353 | ||
354 | } | |
38d8b4e6 HY |
355 | SETPAGEFLAG(SwapCache, swapcache, PF_NO_TAIL) |
356 | CLEARPAGEFLAG(SwapCache, swapcache, PF_NO_TAIL) | |
6a1e7f77 | 357 | #else |
ec7cade8 | 358 | PAGEFLAG_FALSE(SwapCache) |
6a1e7f77 CL |
359 | #endif |
360 | ||
8cb38fab KS |
361 | PAGEFLAG(Unevictable, unevictable, PF_HEAD) |
362 | __CLEARPAGEFLAG(Unevictable, unevictable, PF_HEAD) | |
363 | TESTCLEARFLAG(Unevictable, unevictable, PF_HEAD) | |
b291f000 | 364 | |
af8e3354 | 365 | #ifdef CONFIG_MMU |
e4f87d5d KS |
366 | PAGEFLAG(Mlocked, mlocked, PF_NO_TAIL) |
367 | __CLEARPAGEFLAG(Mlocked, mlocked, PF_NO_TAIL) | |
368 | TESTSCFLAG(Mlocked, mlocked, PF_NO_TAIL) | |
894bc310 | 369 | #else |
2f3e442c | 370 | PAGEFLAG_FALSE(Mlocked) __CLEARPAGEFLAG_NOOP(Mlocked) |
685eaade | 371 | TESTSCFLAG_FALSE(Mlocked) |
894bc310 LS |
372 | #endif |
373 | ||
46cf98cd | 374 | #ifdef CONFIG_ARCH_USES_PG_UNCACHED |
b9d41817 | 375 | PAGEFLAG(Uncached, uncached, PF_NO_COMPOUND) |
602c4d11 | 376 | #else |
ec7cade8 | 377 | PAGEFLAG_FALSE(Uncached) |
6a1e7f77 | 378 | #endif |
1da177e4 | 379 | |
d466f2fc | 380 | #ifdef CONFIG_MEMORY_FAILURE |
95ad9755 KS |
381 | PAGEFLAG(HWPoison, hwpoison, PF_ANY) |
382 | TESTSCFLAG(HWPoison, hwpoison, PF_ANY) | |
d466f2fc | 383 | #define __PG_HWPOISON (1UL << PG_hwpoison) |
d4ae9916 | 384 | extern bool set_hwpoison_free_buddy_page(struct page *page); |
d466f2fc AK |
385 | #else |
386 | PAGEFLAG_FALSE(HWPoison) | |
d4ae9916 NH |
387 | static inline bool set_hwpoison_free_buddy_page(struct page *page) |
388 | { | |
389 | return 0; | |
390 | } | |
d466f2fc AK |
391 | #define __PG_HWPOISON 0 |
392 | #endif | |
393 | ||
33c3fc71 | 394 | #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT) |
95ad9755 KS |
395 | TESTPAGEFLAG(Young, young, PF_ANY) |
396 | SETPAGEFLAG(Young, young, PF_ANY) | |
397 | TESTCLEARFLAG(Young, young, PF_ANY) | |
398 | PAGEFLAG(Idle, idle, PF_ANY) | |
33c3fc71 VD |
399 | #endif |
400 | ||
e8c6158f KS |
401 | /* |
402 | * On an anonymous page mapped into a user virtual memory area, | |
403 | * page->mapping points to its anon_vma, not to a struct address_space; | |
404 | * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. | |
405 | * | |
406 | * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, | |
bda807d4 MK |
407 | * the PAGE_MAPPING_MOVABLE bit may be set along with the PAGE_MAPPING_ANON |
408 | * bit; and then page->mapping points, not to an anon_vma, but to a private | |
e8c6158f KS |
409 | * structure which KSM associates with that merged page. See ksm.h. |
410 | * | |
bda807d4 MK |
411 | * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is used for non-lru movable |
412 | * page and then page->mapping points a struct address_space. | |
e8c6158f KS |
413 | * |
414 | * Please note that, confusingly, "page_mapping" refers to the inode | |
415 | * address_space which maps the page from disk; whereas "page_mapped" | |
416 | * refers to user virtual address space into which the page is mapped. | |
417 | */ | |
bda807d4 MK |
418 | #define PAGE_MAPPING_ANON 0x1 |
419 | #define PAGE_MAPPING_MOVABLE 0x2 | |
420 | #define PAGE_MAPPING_KSM (PAGE_MAPPING_ANON | PAGE_MAPPING_MOVABLE) | |
421 | #define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_MOVABLE) | |
e8c6158f | 422 | |
bda807d4 | 423 | static __always_inline int PageMappingFlags(struct page *page) |
17514574 | 424 | { |
bda807d4 | 425 | return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) != 0; |
17514574 MG |
426 | } |
427 | ||
4b0f3261 | 428 | static __always_inline int PageAnon(struct page *page) |
e8c6158f | 429 | { |
822cdd11 | 430 | page = compound_head(page); |
bda807d4 MK |
431 | return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; |
432 | } | |
433 | ||
434 | static __always_inline int __PageMovable(struct page *page) | |
435 | { | |
436 | return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) == | |
437 | PAGE_MAPPING_MOVABLE; | |
e8c6158f KS |
438 | } |
439 | ||
440 | #ifdef CONFIG_KSM | |
441 | /* | |
442 | * A KSM page is one of those write-protected "shared pages" or "merged pages" | |
443 | * which KSM maps into multiple mms, wherever identical anonymous page content | |
444 | * is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any | |
445 | * anon_vma, but to that page's node of the stable tree. | |
446 | */ | |
4b0f3261 | 447 | static __always_inline int PageKsm(struct page *page) |
e8c6158f | 448 | { |
822cdd11 | 449 | page = compound_head(page); |
e8c6158f | 450 | return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) == |
bda807d4 | 451 | PAGE_MAPPING_KSM; |
e8c6158f KS |
452 | } |
453 | #else | |
454 | TESTPAGEFLAG_FALSE(Ksm) | |
455 | #endif | |
456 | ||
1a9b5b7f WF |
457 | u64 stable_page_flags(struct page *page); |
458 | ||
0ed361de NP |
459 | static inline int PageUptodate(struct page *page) |
460 | { | |
d2998c4d KS |
461 | int ret; |
462 | page = compound_head(page); | |
463 | ret = test_bit(PG_uptodate, &(page)->flags); | |
0ed361de NP |
464 | /* |
465 | * Must ensure that the data we read out of the page is loaded | |
466 | * _after_ we've loaded page->flags to check for PageUptodate. | |
467 | * We can skip the barrier if the page is not uptodate, because | |
468 | * we wouldn't be reading anything from it. | |
469 | * | |
470 | * See SetPageUptodate() for the other side of the story. | |
471 | */ | |
472 | if (ret) | |
473 | smp_rmb(); | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
4b0f3261 | 478 | static __always_inline void __SetPageUptodate(struct page *page) |
0ed361de | 479 | { |
d2998c4d | 480 | VM_BUG_ON_PAGE(PageTail(page), page); |
0ed361de | 481 | smp_wmb(); |
df8c94d1 | 482 | __set_bit(PG_uptodate, &page->flags); |
0ed361de NP |
483 | } |
484 | ||
4b0f3261 | 485 | static __always_inline void SetPageUptodate(struct page *page) |
2dcea57a | 486 | { |
d2998c4d | 487 | VM_BUG_ON_PAGE(PageTail(page), page); |
0ed361de NP |
488 | /* |
489 | * Memory barrier must be issued before setting the PG_uptodate bit, | |
490 | * so that all previous stores issued in order to bring the page | |
491 | * uptodate are actually visible before PageUptodate becomes true. | |
0ed361de NP |
492 | */ |
493 | smp_wmb(); | |
df8c94d1 | 494 | set_bit(PG_uptodate, &page->flags); |
0ed361de NP |
495 | } |
496 | ||
d2998c4d | 497 | CLEARPAGEFLAG(Uptodate, uptodate, PF_NO_TAIL) |
1da177e4 | 498 | |
6a1e7f77 | 499 | int test_clear_page_writeback(struct page *page); |
1c8349a1 NJ |
500 | int __test_set_page_writeback(struct page *page, bool keep_write); |
501 | ||
502 | #define test_set_page_writeback(page) \ | |
503 | __test_set_page_writeback(page, false) | |
504 | #define test_set_page_writeback_keepwrite(page) \ | |
505 | __test_set_page_writeback(page, true) | |
1da177e4 | 506 | |
6a1e7f77 CL |
507 | static inline void set_page_writeback(struct page *page) |
508 | { | |
509 | test_set_page_writeback(page); | |
510 | } | |
1da177e4 | 511 | |
1c8349a1 NJ |
512 | static inline void set_page_writeback_keepwrite(struct page *page) |
513 | { | |
514 | test_set_page_writeback_keepwrite(page); | |
515 | } | |
516 | ||
95ad9755 | 517 | __PAGEFLAG(Head, head, PF_ANY) CLEARPAGEFLAG(Head, head, PF_ANY) |
e20b8cca | 518 | |
4b0f3261 | 519 | static __always_inline void set_compound_head(struct page *page, struct page *head) |
ad4b3fb7 | 520 | { |
1d798ca3 | 521 | WRITE_ONCE(page->compound_head, (unsigned long)head + 1); |
ad4b3fb7 CD |
522 | } |
523 | ||
4b0f3261 | 524 | static __always_inline void clear_compound_head(struct page *page) |
6a1e7f77 | 525 | { |
1d798ca3 | 526 | WRITE_ONCE(page->compound_head, 0); |
6a1e7f77 | 527 | } |
6d777953 | 528 | |
4e6af67e AA |
529 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
530 | static inline void ClearPageCompound(struct page *page) | |
531 | { | |
1d798ca3 KS |
532 | BUG_ON(!PageHead(page)); |
533 | ClearPageHead(page); | |
4e6af67e AA |
534 | } |
535 | #endif | |
536 | ||
d2a1a1f0 | 537 | #define PG_head_mask ((1UL << PG_head)) |
dfa7e20c | 538 | |
e8c6158f KS |
539 | #ifdef CONFIG_HUGETLB_PAGE |
540 | int PageHuge(struct page *page); | |
541 | int PageHeadHuge(struct page *page); | |
7e1f049e | 542 | bool page_huge_active(struct page *page); |
e8c6158f KS |
543 | #else |
544 | TESTPAGEFLAG_FALSE(Huge) | |
545 | TESTPAGEFLAG_FALSE(HeadHuge) | |
7e1f049e NH |
546 | |
547 | static inline bool page_huge_active(struct page *page) | |
548 | { | |
549 | return 0; | |
550 | } | |
e8c6158f KS |
551 | #endif |
552 | ||
7e1f049e | 553 | |
936a5fe6 | 554 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
71e3aac0 AA |
555 | /* |
556 | * PageHuge() only returns true for hugetlbfs pages, but not for | |
557 | * normal or transparent huge pages. | |
558 | * | |
559 | * PageTransHuge() returns true for both transparent huge and | |
560 | * hugetlbfs pages, but not normal pages. PageTransHuge() can only be | |
561 | * called only in the core VM paths where hugetlbfs pages can't exist. | |
562 | */ | |
563 | static inline int PageTransHuge(struct page *page) | |
564 | { | |
309381fe | 565 | VM_BUG_ON_PAGE(PageTail(page), page); |
71e3aac0 AA |
566 | return PageHead(page); |
567 | } | |
568 | ||
385de357 DN |
569 | /* |
570 | * PageTransCompound returns true for both transparent huge pages | |
571 | * and hugetlbfs pages, so it should only be called when it's known | |
572 | * that hugetlbfs pages aren't involved. | |
573 | */ | |
936a5fe6 AA |
574 | static inline int PageTransCompound(struct page *page) |
575 | { | |
576 | return PageCompound(page); | |
577 | } | |
71e3aac0 | 578 | |
127393fb AA |
579 | /* |
580 | * PageTransCompoundMap is the same as PageTransCompound, but it also | |
581 | * guarantees the primary MMU has the entire compound page mapped | |
582 | * through pmd_trans_huge, which in turn guarantees the secondary MMUs | |
583 | * can also map the entire compound page. This allows the secondary | |
584 | * MMUs to call get_user_pages() only once for each compound page and | |
585 | * to immediately map the entire compound page with a single secondary | |
586 | * MMU fault. If there will be a pmd split later, the secondary MMUs | |
587 | * will get an update through the MMU notifier invalidation through | |
588 | * split_huge_pmd(). | |
589 | * | |
590 | * Unlike PageTransCompound, this is safe to be called only while | |
591 | * split_huge_pmd() cannot run from under us, like if protected by the | |
592 | * MMU notifier, otherwise it may result in page->_mapcount < 0 false | |
593 | * positives. | |
594 | */ | |
595 | static inline int PageTransCompoundMap(struct page *page) | |
596 | { | |
597 | return PageTransCompound(page) && atomic_read(&page->_mapcount) < 0; | |
598 | } | |
599 | ||
385de357 DN |
600 | /* |
601 | * PageTransTail returns true for both transparent huge pages | |
602 | * and hugetlbfs pages, so it should only be called when it's known | |
603 | * that hugetlbfs pages aren't involved. | |
604 | */ | |
605 | static inline int PageTransTail(struct page *page) | |
606 | { | |
607 | return PageTail(page); | |
608 | } | |
609 | ||
53f9263b KS |
610 | /* |
611 | * PageDoubleMap indicates that the compound page is mapped with PTEs as well | |
612 | * as PMDs. | |
613 | * | |
614 | * This is required for optimization of rmap operations for THP: we can postpone | |
615 | * per small page mapcount accounting (and its overhead from atomic operations) | |
616 | * until the first PMD split. | |
617 | * | |
618 | * For the page PageDoubleMap means ->_mapcount in all sub-pages is offset up | |
619 | * by one. This reference will go away with last compound_mapcount. | |
620 | * | |
621 | * See also __split_huge_pmd_locked() and page_remove_anon_compound_rmap(). | |
622 | */ | |
623 | static inline int PageDoubleMap(struct page *page) | |
624 | { | |
625 | return PageHead(page) && test_bit(PG_double_map, &page[1].flags); | |
626 | } | |
627 | ||
9a73f61b KS |
628 | static inline void SetPageDoubleMap(struct page *page) |
629 | { | |
630 | VM_BUG_ON_PAGE(!PageHead(page), page); | |
631 | set_bit(PG_double_map, &page[1].flags); | |
632 | } | |
633 | ||
634 | static inline void ClearPageDoubleMap(struct page *page) | |
635 | { | |
636 | VM_BUG_ON_PAGE(!PageHead(page), page); | |
637 | clear_bit(PG_double_map, &page[1].flags); | |
638 | } | |
53f9263b KS |
639 | static inline int TestSetPageDoubleMap(struct page *page) |
640 | { | |
641 | VM_BUG_ON_PAGE(!PageHead(page), page); | |
642 | return test_and_set_bit(PG_double_map, &page[1].flags); | |
643 | } | |
644 | ||
645 | static inline int TestClearPageDoubleMap(struct page *page) | |
646 | { | |
647 | VM_BUG_ON_PAGE(!PageHead(page), page); | |
648 | return test_and_clear_bit(PG_double_map, &page[1].flags); | |
649 | } | |
650 | ||
936a5fe6 | 651 | #else |
d8c1bdeb KS |
652 | TESTPAGEFLAG_FALSE(TransHuge) |
653 | TESTPAGEFLAG_FALSE(TransCompound) | |
127393fb | 654 | TESTPAGEFLAG_FALSE(TransCompoundMap) |
d8c1bdeb | 655 | TESTPAGEFLAG_FALSE(TransTail) |
9a73f61b | 656 | PAGEFLAG_FALSE(DoubleMap) |
53f9263b KS |
657 | TESTSETFLAG_FALSE(DoubleMap) |
658 | TESTCLEARFLAG_FALSE(DoubleMap) | |
936a5fe6 AA |
659 | #endif |
660 | ||
e8c6158f | 661 | /* |
6e292b9b MW |
662 | * For pages that are never mapped to userspace (and aren't PageSlab), |
663 | * page_type may be used. Because it is initialised to -1, we invert the | |
664 | * sense of the bit, so __SetPageFoo *clears* the bit used for PageFoo, and | |
665 | * __ClearPageFoo *sets* the bit used for PageFoo. We reserve a few high and | |
666 | * low bits so that an underflow or overflow of page_mapcount() won't be | |
667 | * mistaken for a page type value. | |
e8c6158f | 668 | */ |
6e292b9b MW |
669 | |
670 | #define PAGE_TYPE_BASE 0xf0000000 | |
671 | /* Reserve 0x0000007f to catch underflows of page_mapcount */ | |
672 | #define PG_buddy 0x00000080 | |
673 | #define PG_balloon 0x00000100 | |
674 | #define PG_kmemcg 0x00000200 | |
1d40a5ea | 675 | #define PG_table 0x00000400 |
6e292b9b MW |
676 | |
677 | #define PageType(page, flag) \ | |
678 | ((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE) | |
679 | ||
680 | #define PAGE_TYPE_OPS(uname, lname) \ | |
632c0a1a VD |
681 | static __always_inline int Page##uname(struct page *page) \ |
682 | { \ | |
6e292b9b | 683 | return PageType(page, PG_##lname); \ |
632c0a1a VD |
684 | } \ |
685 | static __always_inline void __SetPage##uname(struct page *page) \ | |
686 | { \ | |
6e292b9b MW |
687 | VM_BUG_ON_PAGE(!PageType(page, 0), page); \ |
688 | page->page_type &= ~PG_##lname; \ | |
632c0a1a VD |
689 | } \ |
690 | static __always_inline void __ClearPage##uname(struct page *page) \ | |
691 | { \ | |
692 | VM_BUG_ON_PAGE(!Page##uname(page), page); \ | |
6e292b9b | 693 | page->page_type |= PG_##lname; \ |
e8c6158f KS |
694 | } |
695 | ||
632c0a1a | 696 | /* |
6e292b9b | 697 | * PageBuddy() indicates that the page is free and in the buddy system |
632c0a1a VD |
698 | * (see mm/page_alloc.c). |
699 | */ | |
6e292b9b | 700 | PAGE_TYPE_OPS(Buddy, buddy) |
e8c6158f | 701 | |
632c0a1a | 702 | /* |
6e292b9b | 703 | * PageBalloon() is true for pages that are on the balloon page list |
632c0a1a VD |
704 | * (see mm/balloon_compaction.c). |
705 | */ | |
6e292b9b | 706 | PAGE_TYPE_OPS(Balloon, balloon) |
e8c6158f | 707 | |
4949148a VD |
708 | /* |
709 | * If kmemcg is enabled, the buddy allocator will set PageKmemcg() on | |
710 | * pages allocated with __GFP_ACCOUNT. It gets cleared on page free. | |
711 | */ | |
6e292b9b | 712 | PAGE_TYPE_OPS(Kmemcg, kmemcg) |
4949148a | 713 | |
1d40a5ea MW |
714 | /* |
715 | * Marks pages in use as page tables. | |
716 | */ | |
717 | PAGE_TYPE_OPS(Table, table) | |
718 | ||
832fc1de NH |
719 | extern bool is_free_buddy_page(struct page *page); |
720 | ||
bda807d4 MK |
721 | __PAGEFLAG(Isolated, isolated, PF_ANY); |
722 | ||
072bb0aa MG |
723 | /* |
724 | * If network-based swap is enabled, sl*b must keep track of whether pages | |
725 | * were allocated from pfmemalloc reserves. | |
726 | */ | |
727 | static inline int PageSlabPfmemalloc(struct page *page) | |
728 | { | |
309381fe | 729 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
072bb0aa MG |
730 | return PageActive(page); |
731 | } | |
732 | ||
733 | static inline void SetPageSlabPfmemalloc(struct page *page) | |
734 | { | |
309381fe | 735 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
072bb0aa MG |
736 | SetPageActive(page); |
737 | } | |
738 | ||
739 | static inline void __ClearPageSlabPfmemalloc(struct page *page) | |
740 | { | |
309381fe | 741 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
072bb0aa MG |
742 | __ClearPageActive(page); |
743 | } | |
744 | ||
745 | static inline void ClearPageSlabPfmemalloc(struct page *page) | |
746 | { | |
309381fe | 747 | VM_BUG_ON_PAGE(!PageSlab(page), page); |
072bb0aa MG |
748 | ClearPageActive(page); |
749 | } | |
750 | ||
af8e3354 | 751 | #ifdef CONFIG_MMU |
d2a1a1f0 | 752 | #define __PG_MLOCKED (1UL << PG_mlocked) |
33925b25 | 753 | #else |
b291f000 | 754 | #define __PG_MLOCKED 0 |
894bc310 LS |
755 | #endif |
756 | ||
dfa7e20c RA |
757 | /* |
758 | * Flags checked when a page is freed. Pages being freed should not have | |
759 | * these flags set. It they are, there is a problem. | |
760 | */ | |
6326fec1 NP |
761 | #define PAGE_FLAGS_CHECK_AT_FREE \ |
762 | (1UL << PG_lru | 1UL << PG_locked | \ | |
763 | 1UL << PG_private | 1UL << PG_private_2 | \ | |
764 | 1UL << PG_writeback | 1UL << PG_reserved | \ | |
765 | 1UL << PG_slab | 1UL << PG_active | \ | |
766 | 1UL << PG_unevictable | __PG_MLOCKED) | |
dfa7e20c RA |
767 | |
768 | /* | |
769 | * Flags checked when a page is prepped for return by the page allocator. | |
f4c18e6f | 770 | * Pages being prepped should not have these flags set. It they are set, |
79f4b7bf | 771 | * there has been a kernel bug or struct page corruption. |
f4c18e6f NH |
772 | * |
773 | * __PG_HWPOISON is exceptional because it needs to be kept beyond page's | |
774 | * alloc-free cycle to prevent from reusing the page. | |
dfa7e20c | 775 | */ |
f4c18e6f | 776 | #define PAGE_FLAGS_CHECK_AT_PREP \ |
d2a1a1f0 | 777 | (((1UL << NR_PAGEFLAGS) - 1) & ~__PG_HWPOISON) |
dfa7e20c | 778 | |
edcf4748 | 779 | #define PAGE_FLAGS_PRIVATE \ |
d2a1a1f0 | 780 | (1UL << PG_private | 1UL << PG_private_2) |
266cf658 DH |
781 | /** |
782 | * page_has_private - Determine if page has private stuff | |
783 | * @page: The page to be checked | |
784 | * | |
785 | * Determine if a page has private stuff, indicating that release routines | |
786 | * should be invoked upon it. | |
787 | */ | |
edcf4748 JW |
788 | static inline int page_has_private(struct page *page) |
789 | { | |
790 | return !!(page->flags & PAGE_FLAGS_PRIVATE); | |
791 | } | |
792 | ||
95ad9755 KS |
793 | #undef PF_ANY |
794 | #undef PF_HEAD | |
62906027 | 795 | #undef PF_ONLY_HEAD |
95ad9755 KS |
796 | #undef PF_NO_TAIL |
797 | #undef PF_NO_COMPOUND | |
edcf4748 | 798 | #endif /* !__GENERATING_BOUNDS_H */ |
266cf658 | 799 | |
1da177e4 | 800 | #endif /* PAGE_FLAGS_H */ |