1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * Written by Mark Hemment, 1996 (markhe@nextd 3 * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
4 * 4 *
5 * (C) SGI 2006, Christoph Lameter 5 * (C) SGI 2006, Christoph Lameter
6 * Cleaned up and restructured to ease th 6 * Cleaned up and restructured to ease the addition of alternative
7 * implementations of SLAB allocators. 7 * implementations of SLAB allocators.
8 * (C) Linux Foundation 2008-2013 8 * (C) Linux Foundation 2008-2013
9 * Unified interface for all slab allocat 9 * Unified interface for all slab allocators
10 */ 10 */
11 11
12 #ifndef _LINUX_SLAB_H 12 #ifndef _LINUX_SLAB_H
13 #define _LINUX_SLAB_H 13 #define _LINUX_SLAB_H
14 14
15 #include <linux/cache.h> <<
16 #include <linux/gfp.h> 15 #include <linux/gfp.h>
17 #include <linux/overflow.h> <<
18 #include <linux/types.h> 16 #include <linux/types.h>
19 #include <linux/workqueue.h> 17 #include <linux/workqueue.h>
20 #include <linux/percpu-refcount.h> <<
21 #include <linux/cleanup.h> <<
22 #include <linux/hash.h> <<
23 <<
24 enum _slab_flag_bits { <<
25 _SLAB_CONSISTENCY_CHECKS, <<
26 _SLAB_RED_ZONE, <<
27 _SLAB_POISON, <<
28 _SLAB_KMALLOC, <<
29 _SLAB_HWCACHE_ALIGN, <<
30 _SLAB_CACHE_DMA, <<
31 _SLAB_CACHE_DMA32, <<
32 _SLAB_STORE_USER, <<
33 _SLAB_PANIC, <<
34 _SLAB_TYPESAFE_BY_RCU, <<
35 _SLAB_TRACE, <<
36 #ifdef CONFIG_DEBUG_OBJECTS <<
37 _SLAB_DEBUG_OBJECTS, <<
38 #endif <<
39 _SLAB_NOLEAKTRACE, <<
40 _SLAB_NO_MERGE, <<
41 #ifdef CONFIG_FAILSLAB <<
42 _SLAB_FAILSLAB, <<
43 #endif <<
44 #ifdef CONFIG_MEMCG <<
45 _SLAB_ACCOUNT, <<
46 #endif <<
47 #ifdef CONFIG_KASAN_GENERIC <<
48 _SLAB_KASAN, <<
49 #endif <<
50 _SLAB_NO_USER_FLAGS, <<
51 #ifdef CONFIG_KFENCE <<
52 _SLAB_SKIP_KFENCE, <<
53 #endif <<
54 #ifndef CONFIG_SLUB_TINY <<
55 _SLAB_RECLAIM_ACCOUNT, <<
56 #endif <<
57 _SLAB_OBJECT_POISON, <<
58 _SLAB_CMPXCHG_DOUBLE, <<
59 #ifdef CONFIG_SLAB_OBJ_EXT <<
60 _SLAB_NO_OBJ_EXT, <<
61 #endif <<
62 _SLAB_FLAGS_LAST_BIT <<
63 }; <<
64 18
65 #define __SLAB_FLAG_BIT(nr) ((slab_flags_t <<
66 #define __SLAB_FLAG_UNUSED ((slab_flags_t <<
67 19
68 /* 20 /*
69 * Flags to pass to kmem_cache_create(). 21 * Flags to pass to kmem_cache_create().
70 * The ones marked DEBUG need CONFIG_SLUB_DEBU !! 22 * The ones marked DEBUG are only valid if CONFIG_DEBUG_SLAB is set.
71 */ 23 */
72 /* DEBUG: Perform (expensive) checks on alloc/ 24 /* DEBUG: Perform (expensive) checks on alloc/free */
73 #define SLAB_CONSISTENCY_CHECKS __SLAB_FLAG_BI !! 25 #define SLAB_CONSISTENCY_CHECKS ((slab_flags_t __force)0x00000100U)
74 /* DEBUG: Red zone objs in a cache */ 26 /* DEBUG: Red zone objs in a cache */
75 #define SLAB_RED_ZONE __SLAB_FLAG_BI !! 27 #define SLAB_RED_ZONE ((slab_flags_t __force)0x00000400U)
76 /* DEBUG: Poison objects */ 28 /* DEBUG: Poison objects */
77 #define SLAB_POISON __SLAB_FLAG_BI !! 29 #define SLAB_POISON ((slab_flags_t __force)0x00000800U)
78 /* Indicate a kmalloc slab */ <<
79 #define SLAB_KMALLOC __SLAB_FLAG_BI <<
80 /* Align objs on cache lines */ 30 /* Align objs on cache lines */
81 #define SLAB_HWCACHE_ALIGN __SLAB_FLAG_BI !! 31 #define SLAB_HWCACHE_ALIGN ((slab_flags_t __force)0x00002000U)
82 /* Use GFP_DMA memory */ 32 /* Use GFP_DMA memory */
83 #define SLAB_CACHE_DMA __SLAB_FLAG_BI !! 33 #define SLAB_CACHE_DMA ((slab_flags_t __force)0x00004000U)
84 /* Use GFP_DMA32 memory */ <<
85 #define SLAB_CACHE_DMA32 __SLAB_FLAG_BI <<
86 /* DEBUG: Store the last owner for bug hunting 34 /* DEBUG: Store the last owner for bug hunting */
87 #define SLAB_STORE_USER __SLAB_FLAG_BI !! 35 #define SLAB_STORE_USER ((slab_flags_t __force)0x00010000U)
88 /* Panic if kmem_cache_create() fails */ 36 /* Panic if kmem_cache_create() fails */
89 #define SLAB_PANIC __SLAB_FLAG_BI !! 37 #define SLAB_PANIC ((slab_flags_t __force)0x00040000U)
90 /* 38 /*
91 * SLAB_TYPESAFE_BY_RCU - **WARNING** READ THI 39 * SLAB_TYPESAFE_BY_RCU - **WARNING** READ THIS!
92 * 40 *
93 * This delays freeing the SLAB page by a grac 41 * This delays freeing the SLAB page by a grace period, it does _NOT_
94 * delay object freeing. This means that if yo 42 * delay object freeing. This means that if you do kmem_cache_free()
95 * that memory location is free to be reused a 43 * that memory location is free to be reused at any time. Thus it may
96 * be possible to see another object there in 44 * be possible to see another object there in the same RCU grace period.
97 * 45 *
98 * This feature only ensures the memory locati 46 * This feature only ensures the memory location backing the object
99 * stays valid, the trick to using this is rel 47 * stays valid, the trick to using this is relying on an independent
100 * object validation pass. Something like: 48 * object validation pass. Something like:
101 * 49 *
102 * begin: !! 50 * rcu_read_lock()
103 * rcu_read_lock(); !! 51 * again:
104 * obj = lockless_lookup(key); 52 * obj = lockless_lookup(key);
105 * if (obj) { 53 * if (obj) {
106 * if (!try_get_ref(obj)) // might fail for 54 * if (!try_get_ref(obj)) // might fail for free objects
107 * rcu_read_unlock(); !! 55 * goto again;
108 * goto begin; <<
109 * 56 *
110 * if (obj->key != key) { // not the object 57 * if (obj->key != key) { // not the object we expected
111 * put_ref(obj); 58 * put_ref(obj);
112 * rcu_read_unlock(); !! 59 * goto again;
113 * goto begin; <<
114 * } 60 * }
115 * } 61 * }
116 * rcu_read_unlock(); 62 * rcu_read_unlock();
117 * 63 *
118 * This is useful if we need to approach a ker 64 * This is useful if we need to approach a kernel structure obliquely,
119 * from its address obtained without the usual 65 * from its address obtained without the usual locking. We can lock
120 * the structure to stabilize it and check it' 66 * the structure to stabilize it and check it's still at the given address,
121 * only if we can be sure that the memory has 67 * only if we can be sure that the memory has not been meanwhile reused
122 * for some other kind of object (which our su 68 * for some other kind of object (which our subsystem's lock might corrupt).
123 * 69 *
124 * rcu_read_lock before reading the address, t 70 * rcu_read_lock before reading the address, then rcu_read_unlock after
125 * taking the spinlock within the structure ex 71 * taking the spinlock within the structure expected at that address.
126 * 72 *
127 * Note that it is not possible to acquire a l <<
128 * allocated with SLAB_TYPESAFE_BY_RCU without <<
129 * as described above. The reason is that SLA <<
130 * are not zeroed before being given to the sl <<
131 * locks must be initialized after each and ev <<
132 * Alternatively, make the ctor passed to kmem <<
133 * the locks at page-allocation time, as is do <<
134 * sighand_ctor(), and anon_vma_ctor(). Such <<
135 * to safely acquire those ctor-initialized lo <<
136 * protection. <<
137 * <<
138 * Note that SLAB_TYPESAFE_BY_RCU was original 73 * Note that SLAB_TYPESAFE_BY_RCU was originally named SLAB_DESTROY_BY_RCU.
139 */ 74 */
140 /* Defer freeing slabs to RCU */ 75 /* Defer freeing slabs to RCU */
141 #define SLAB_TYPESAFE_BY_RCU __SLAB_FLAG_BI !! 76 #define SLAB_TYPESAFE_BY_RCU ((slab_flags_t __force)0x00080000U)
>> 77 /* Spread some memory over cpuset */
>> 78 #define SLAB_MEM_SPREAD ((slab_flags_t __force)0x00100000U)
142 /* Trace allocations and frees */ 79 /* Trace allocations and frees */
143 #define SLAB_TRACE __SLAB_FLAG_BI !! 80 #define SLAB_TRACE ((slab_flags_t __force)0x00200000U)
144 81
145 /* Flag to prevent checks on free */ 82 /* Flag to prevent checks on free */
146 #ifdef CONFIG_DEBUG_OBJECTS 83 #ifdef CONFIG_DEBUG_OBJECTS
147 # define SLAB_DEBUG_OBJECTS __SLAB_FLAG_BI !! 84 # define SLAB_DEBUG_OBJECTS ((slab_flags_t __force)0x00400000U)
148 #else 85 #else
149 # define SLAB_DEBUG_OBJECTS __SLAB_FLAG_UN !! 86 # define SLAB_DEBUG_OBJECTS 0
150 #endif 87 #endif
151 88
152 /* Avoid kmemleak tracing */ 89 /* Avoid kmemleak tracing */
153 #define SLAB_NOLEAKTRACE __SLAB_FLAG_BI !! 90 #define SLAB_NOLEAKTRACE ((slab_flags_t __force)0x00800000U)
154 <<
155 /* <<
156 * Prevent merging with compatible kmem caches <<
157 * cautiously. Valid use cases: <<
158 * <<
159 * - caches created for self-tests (e.g. kunit <<
160 * - general caches created and used by a subs <<
161 * (subsystem-specific) debug option is enab <<
162 * - performance critical caches, should be ve <<
163 * maintainers, and not used together with C <<
164 */ <<
165 #define SLAB_NO_MERGE __SLAB_FLAG_BI <<
166 91
167 /* Fault injection mark */ 92 /* Fault injection mark */
168 #ifdef CONFIG_FAILSLAB 93 #ifdef CONFIG_FAILSLAB
169 # define SLAB_FAILSLAB __SLAB_FLAG_BI !! 94 # define SLAB_FAILSLAB ((slab_flags_t __force)0x02000000U)
170 #else 95 #else
171 # define SLAB_FAILSLAB __SLAB_FLAG_UN !! 96 # define SLAB_FAILSLAB 0
172 #endif 97 #endif
173 /* Account to memcg */ 98 /* Account to memcg */
174 #ifdef CONFIG_MEMCG !! 99 #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
175 # define SLAB_ACCOUNT __SLAB_FLAG_BI !! 100 # define SLAB_ACCOUNT ((slab_flags_t __force)0x04000000U)
176 #else <<
177 # define SLAB_ACCOUNT __SLAB_FLAG_UN <<
178 #endif <<
179 <<
180 #ifdef CONFIG_KASAN_GENERIC <<
181 #define SLAB_KASAN __SLAB_FLAG_BI <<
182 #else 101 #else
183 #define SLAB_KASAN __SLAB_FLAG_UN !! 102 # define SLAB_ACCOUNT 0
184 #endif 103 #endif
185 104
186 /* !! 105 #ifdef CONFIG_KASAN
187 * Ignore user specified debugging flags. !! 106 #define SLAB_KASAN ((slab_flags_t __force)0x08000000U)
188 * Intended for caches created for self-tests <<
189 * specified in the code and other flags are i <<
190 */ <<
191 #define SLAB_NO_USER_FLAGS __SLAB_FLAG_BI <<
192 <<
193 #ifdef CONFIG_KFENCE <<
194 #define SLAB_SKIP_KFENCE __SLAB_FLAG_BI <<
195 #else 107 #else
196 #define SLAB_SKIP_KFENCE __SLAB_FLAG_UN !! 108 #define SLAB_KASAN 0
197 #endif 109 #endif
198 110
199 /* The following flags affect the page allocat 111 /* The following flags affect the page allocator grouping pages by mobility */
200 /* Objects are reclaimable */ 112 /* Objects are reclaimable */
201 #ifndef CONFIG_SLUB_TINY !! 113 #define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000U)
202 #define SLAB_RECLAIM_ACCOUNT __SLAB_FLAG_BI <<
203 #else <<
204 #define SLAB_RECLAIM_ACCOUNT __SLAB_FLAG_UN <<
205 #endif <<
206 #define SLAB_TEMPORARY SLAB_RECLAIM_A 114 #define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */
207 <<
208 /* Slab created using create_boot_cache */ <<
209 #ifdef CONFIG_SLAB_OBJ_EXT <<
210 #define SLAB_NO_OBJ_EXT __SLAB_FLAG_BI <<
211 #else <<
212 #define SLAB_NO_OBJ_EXT __SLAB_FLAG_UN <<
213 #endif <<
214 <<
215 /* <<
216 * freeptr_t represents a SLUB freelist pointe <<
217 * and not dereferenceable if CONFIG_SLAB_FREE <<
218 */ <<
219 typedef struct { unsigned long v; } freeptr_t; <<
220 <<
221 /* 115 /*
222 * ZERO_SIZE_PTR will be returned for zero siz 116 * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
223 * 117 *
224 * Dereferencing ZERO_SIZE_PTR will lead to a 118 * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault.
225 * 119 *
226 * ZERO_SIZE_PTR can be passed to kfree though 120 * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can.
227 * Both make kfree a no-op. 121 * Both make kfree a no-op.
228 */ 122 */
229 #define ZERO_SIZE_PTR ((void *)16) 123 #define ZERO_SIZE_PTR ((void *)16)
230 124
231 #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x 125 #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
232 (unsigned long 126 (unsigned long)ZERO_SIZE_PTR)
233 127
234 #include <linux/kasan.h> 128 #include <linux/kasan.h>
235 129
236 struct list_lru; <<
237 struct mem_cgroup; 130 struct mem_cgroup;
238 /* 131 /*
239 * struct kmem_cache related prototypes 132 * struct kmem_cache related prototypes
240 */ 133 */
>> 134 void __init kmem_cache_init(void);
241 bool slab_is_available(void); 135 bool slab_is_available(void);
242 136
243 /** !! 137 extern bool usercopy_fallback;
244 * struct kmem_cache_args - Less common argume <<
245 * <<
246 * Any uninitialized fields of the structure a <<
247 * exception is @freeptr_offset where %0 is a <<
248 * @use_freeptr_offset must be also set to %tr <<
249 * as used. For @useroffset %0 is also valid, <<
250 * @usersize. <<
251 * <<
252 * When %NULL args is passed to kmem_cache_cre <<
253 * fields unused. <<
254 */ <<
255 struct kmem_cache_args { <<
256 /** <<
257 * @align: The required alignment for <<
258 * <<
259 * %0 means no specific alignment is r <<
260 */ <<
261 unsigned int align; <<
262 /** <<
263 * @useroffset: Usercopy region offset <<
264 * <<
265 * %0 is a valid offset, when @usersiz <<
266 */ <<
267 unsigned int useroffset; <<
268 /** <<
269 * @usersize: Usercopy region size. <<
270 * <<
271 * %0 means no usercopy region is spec <<
272 */ <<
273 unsigned int usersize; <<
274 /** <<
275 * @freeptr_offset: Custom offset for <<
276 * in &SLAB_TYPESAFE_BY_RCU caches <<
277 * <<
278 * By default &SLAB_TYPESAFE_BY_RCU ca <<
279 * outside of the object. This might c <<
280 * Cache creators that have a reason t <<
281 * free pointer offset in their struct <<
282 * placed. <<
283 * <<
284 * Note that placing the free pointer <<
285 * caller to ensure that no fields are <<
286 * guard against object recycling (See <<
287 * details). <<
288 * <<
289 * Using %0 as a value for @freeptr_of <<
290 * is specified, %use_freeptr_offset m <<
291 * <<
292 * Note that @ctor currently isn't sup <<
293 * as a @ctor requires an external fre <<
294 */ <<
295 unsigned int freeptr_offset; <<
296 /** <<
297 * @use_freeptr_offset: Whether a @fre <<
298 */ <<
299 bool use_freeptr_offset; <<
300 /** <<
301 * @ctor: A constructor for the object <<
302 * <<
303 * The constructor is invoked for each <<
304 * page. It is the cache user's respon <<
305 * same state as after calling the con <<
306 * with any differences between a fres <<
307 * object. <<
308 * <<
309 * %NULL means no constructor. <<
310 */ <<
311 void (*ctor)(void *); <<
312 }; <<
313 <<
314 struct kmem_cache *__kmem_cache_create_args(co <<
315 un <<
316 st <<
317 sl <<
318 static inline struct kmem_cache * <<
319 __kmem_cache_create(const char *name, unsigned <<
320 slab_flags_t flags, void ( <<
321 { <<
322 struct kmem_cache_args kmem_args = { <<
323 .align = align, <<
324 .ctor = ctor, <<
325 }; <<
326 <<
327 return __kmem_cache_create_args(name, <<
328 } <<
329 <<
330 /** <<
331 * kmem_cache_create_usercopy - Create a kmem <<
332 * for copying to userspace. <<
333 * @name: A string which is used in /proc/slab <<
334 * @size: The size of objects to be created in <<
335 * @align: The required alignment for the obje <<
336 * @flags: SLAB flags <<
337 * @useroffset: Usercopy region offset <<
338 * @usersize: Usercopy region size <<
339 * @ctor: A constructor for the objects, or %N <<
340 * <<
341 * This is a legacy wrapper, new code should u <<
342 * if whitelisting a single field is sufficien <<
343 * the necessary parameters passed via the arg <<
344 * &struct kmem_cache_args) <<
345 * <<
346 * Return: a pointer to the cache on success, <<
347 */ <<
348 static inline struct kmem_cache * <<
349 kmem_cache_create_usercopy(const char *name, u <<
350 unsigned int align, <<
351 unsigned int userof <<
352 void (*ctor)(void * <<
353 { <<
354 struct kmem_cache_args kmem_args = { <<
355 .align = align, <<
356 .ctor = ctor, <<
357 .useroffset = useroffset, <<
358 .usersize = usersize, <<
359 }; <<
360 <<
361 return __kmem_cache_create_args(name, <<
362 } <<
363 138
364 /* If NULL is passed for @args, use this varia !! 139 struct kmem_cache *kmem_cache_create(const char *name, unsigned int size,
365 static inline struct kmem_cache * !! 140 unsigned int align, slab_flags_t flags,
366 __kmem_cache_default_args(const char *name, un !! 141 void (*ctor)(void *));
367 struct kmem_cache_ar !! 142 struct kmem_cache *kmem_cache_create_usercopy(const char *name,
368 slab_flags_t flags) !! 143 unsigned int size, unsigned int align,
369 { !! 144 slab_flags_t flags,
370 struct kmem_cache_args kmem_default_ar !! 145 unsigned int useroffset, unsigned int usersize,
371 !! 146 void (*ctor)(void *));
372 /* Make sure we don't get passed garba !! 147 void kmem_cache_destroy(struct kmem_cache *);
373 if (WARN_ON_ONCE(args)) !! 148 int kmem_cache_shrink(struct kmem_cache *);
374 return ERR_PTR(-EINVAL); !! 149
375 !! 150 void memcg_create_kmem_cache(struct mem_cgroup *, struct kmem_cache *);
376 return __kmem_cache_create_args(name, !! 151 void memcg_deactivate_kmem_caches(struct mem_cgroup *);
377 } !! 152 void memcg_destroy_kmem_caches(struct mem_cgroup *);
378 <<
379 /** <<
380 * kmem_cache_create - Create a kmem cache. <<
381 * @__name: A string which is used in /proc/sl <<
382 * @__object_size: The size of objects to be c <<
383 * @__args: Optional arguments, see &struct km <<
384 * means defaults will be used for al <<
385 * <<
386 * This is currently implemented as a macro us <<
387 * either the new variant of the function, or <<
388 * <<
389 * The new variant has 4 parameters: <<
390 * ``kmem_cache_create(name, object_size, args <<
391 * <<
392 * See __kmem_cache_create_args() which implem <<
393 * <<
394 * The legacy variant has 5 parameters: <<
395 * ``kmem_cache_create(name, object_size, alig <<
396 * <<
397 * The align and ctor parameters map to the re <<
398 * &struct kmem_cache_args <<
399 * <<
400 * Context: Cannot be called within a interrup <<
401 * <<
402 * Return: a pointer to the cache on success, <<
403 */ <<
404 #define kmem_cache_create(__name, __object_siz <<
405 _Generic((__args), <<
406 struct kmem_cache_args *: __km <<
407 void *: __kmem_cache_default_a <<
408 default: __kmem_cache_create)( <<
409 <<
410 void kmem_cache_destroy(struct kmem_cache *s); <<
411 int kmem_cache_shrink(struct kmem_cache *s); <<
412 153
413 /* 154 /*
414 * Please use this macro to create slab caches 155 * Please use this macro to create slab caches. Simply specify the
415 * name of the structure and maybe some flags 156 * name of the structure and maybe some flags that are listed above.
416 * 157 *
417 * The alignment of the struct determines obje 158 * The alignment of the struct determines object alignment. If you
418 * f.e. add ____cacheline_aligned_in_smp to th 159 * f.e. add ____cacheline_aligned_in_smp to the struct declaration
419 * then the objects will be properly aligned i 160 * then the objects will be properly aligned in SMP configurations.
420 */ 161 */
421 #define KMEM_CACHE(__struct, __flags) !! 162 #define KMEM_CACHE(__struct, __flags) \
422 __kmem_cache_create_args(#__struct, si !! 163 kmem_cache_create(#__struct, sizeof(struct __struct), \
423 &(struct kmem_cache_ar !! 164 __alignof__(struct __struct), (__flags), NULL)
424 .align = __al <<
425 }, (__flags)) <<
426 165
427 /* 166 /*
428 * To whitelist a single field for copying to/ 167 * To whitelist a single field for copying to/from usercopy, use this
429 * macro instead for KMEM_CACHE() above. 168 * macro instead for KMEM_CACHE() above.
430 */ 169 */
431 #define KMEM_CACHE_USERCOPY(__struct, __flags, !! 170 #define KMEM_CACHE_USERCOPY(__struct, __flags, __field) \
432 __kmem_cache_create_args(#__struct, si !! 171 kmem_cache_create_usercopy(#__struct, \
433 &(struct kmem_cache_ar !! 172 sizeof(struct __struct), \
434 .align !! 173 __alignof__(struct __struct), (__flags), \
435 .useroffset !! 174 offsetof(struct __struct, __field), \
436 .usersize !! 175 sizeof_field(struct __struct, __field), NULL)
437 }, (__flags)) <<
438 176
439 /* 177 /*
440 * Common kmalloc functions provided by all al 178 * Common kmalloc functions provided by all allocators
441 */ 179 */
442 void * __must_check krealloc_noprof(const void !! 180 void * __must_check __krealloc(const void *, size_t, gfp_t);
443 gfp_t flag !! 181 void * __must_check krealloc(const void *, size_t, gfp_t);
444 #define krealloc(...) !! 182 void kfree(const void *);
445 !! 183 void kzfree(const void *);
446 void kfree(const void *objp); !! 184 size_t ksize(const void *);
447 void kfree_sensitive(const void *objp); !! 185
448 size_t __ksize(const void *objp); !! 186 #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR
449 !! 187 void __check_heap_object(const void *ptr, unsigned long n, struct page *page,
450 DEFINE_FREE(kfree, void *, if (!IS_ERR_OR_NULL !! 188 bool to_user);
451 <<
452 /** <<
453 * ksize - Report actual allocation size of as <<
454 * <<
455 * @objp: Pointer returned from a prior kmallo <<
456 * <<
457 * This should not be used for writing beyond <<
458 * allocation size. Either use krealloc() or r <<
459 * with kmalloc_size_roundup() prior to alloca <<
460 * access beyond the originally requested allo <<
461 * and/or FORTIFY_SOURCE may trip, since they <<
462 * originally allocated size via the __alloc_s <<
463 */ <<
464 size_t ksize(const void *objp); <<
465 <<
466 #ifdef CONFIG_PRINTK <<
467 bool kmem_dump_obj(void *object); <<
468 #else 189 #else
469 static inline bool kmem_dump_obj(void *object) !! 190 static inline void __check_heap_object(const void *ptr, unsigned long n,
>> 191 struct page *page, bool to_user) { }
470 #endif 192 #endif
471 193
472 /* 194 /*
473 * Some archs want to perform DMA into kmalloc 195 * Some archs want to perform DMA into kmalloc caches and need a guaranteed
474 * alignment larger than the alignment of a 64 196 * alignment larger than the alignment of a 64-bit integer.
475 * Setting ARCH_DMA_MINALIGN in arch headers a !! 197 * Setting ARCH_KMALLOC_MINALIGN in arch headers allows that.
476 */ 198 */
477 #ifdef ARCH_HAS_DMA_MINALIGN !! 199 #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8
478 #if ARCH_DMA_MINALIGN > 8 && !defined(ARCH_KMA <<
479 #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIG 200 #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
480 #endif !! 201 #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN
481 #endif !! 202 #define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN)
482 !! 203 #else
483 #ifndef ARCH_KMALLOC_MINALIGN <<
484 #define ARCH_KMALLOC_MINALIGN __alignof__(unsi 204 #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
485 #elif ARCH_KMALLOC_MINALIGN > 8 <<
486 #define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN <<
487 #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SI <<
488 #endif 205 #endif
489 206
490 /* 207 /*
491 * Setting ARCH_SLAB_MINALIGN in arch headers 208 * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.
492 * Intended for arches that get misalignment f 209 * Intended for arches that get misalignment faults even for 64 bit integer
493 * aligned buffers. 210 * aligned buffers.
494 */ 211 */
495 #ifndef ARCH_SLAB_MINALIGN 212 #ifndef ARCH_SLAB_MINALIGN
496 #define ARCH_SLAB_MINALIGN __alignof__(unsigne 213 #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
497 #endif 214 #endif
498 215
499 /* 216 /*
500 * Arches can define this function if they wan !! 217 * kmalloc and friends return ARCH_KMALLOC_MINALIGN aligned
501 * alignment at runtime. The value returned by !! 218 * pointers. kmem_cache_alloc and friends return ARCH_SLAB_MINALIGN
502 * of two and >= ARCH_SLAB_MINALIGN. !! 219 * aligned pointers.
503 */ <<
504 #ifndef arch_slab_minalign <<
505 static inline unsigned int arch_slab_minalign( <<
506 { <<
507 return ARCH_SLAB_MINALIGN; <<
508 } <<
509 #endif <<
510 <<
511 /* <<
512 * kmem_cache_alloc and friends return pointer <<
513 * kmalloc and friends return pointers aligned <<
514 * and ARCH_SLAB_MINALIGN, but here we only as <<
515 */ 220 */
516 #define __assume_kmalloc_alignment __assume_al 221 #define __assume_kmalloc_alignment __assume_aligned(ARCH_KMALLOC_MINALIGN)
517 #define __assume_slab_alignment __assume_align 222 #define __assume_slab_alignment __assume_aligned(ARCH_SLAB_MINALIGN)
518 #define __assume_page_alignment __assume_align 223 #define __assume_page_alignment __assume_aligned(PAGE_SIZE)
519 224
520 /* 225 /*
521 * Kmalloc array related definitions 226 * Kmalloc array related definitions
522 */ 227 */
523 228
>> 229 #ifdef CONFIG_SLAB
>> 230 /*
>> 231 * The largest kmalloc size supported by the SLAB allocators is
>> 232 * 32 megabyte (2^25) or the maximum allocatable page order if that is
>> 233 * less than 32 MB.
>> 234 *
>> 235 * WARNING: Its not easy to increase this value since the allocators have
>> 236 * to do various tricks to work around compiler limitations in order to
>> 237 * ensure proper constant folding.
>> 238 */
>> 239 #define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
>> 240 (MAX_ORDER + PAGE_SHIFT - 1) : 25)
>> 241 #define KMALLOC_SHIFT_MAX KMALLOC_SHIFT_HIGH
>> 242 #ifndef KMALLOC_SHIFT_LOW
>> 243 #define KMALLOC_SHIFT_LOW 5
>> 244 #endif
>> 245 #endif
>> 246
>> 247 #ifdef CONFIG_SLUB
524 /* 248 /*
525 * SLUB directly allocates requests fitting in 249 * SLUB directly allocates requests fitting in to an order-1 page
526 * (PAGE_SIZE*2). Larger requests are passed 250 * (PAGE_SIZE*2). Larger requests are passed to the page allocator.
527 */ 251 */
528 #define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 252 #define KMALLOC_SHIFT_HIGH (PAGE_SHIFT + 1)
529 #define KMALLOC_SHIFT_MAX (MAX_PAGE_ORDE !! 253 #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT - 1)
530 #ifndef KMALLOC_SHIFT_LOW 254 #ifndef KMALLOC_SHIFT_LOW
531 #define KMALLOC_SHIFT_LOW 3 255 #define KMALLOC_SHIFT_LOW 3
532 #endif 256 #endif
>> 257 #endif
>> 258
>> 259 #ifdef CONFIG_SLOB
>> 260 /*
>> 261 * SLOB passes all requests larger than one page to the page allocator.
>> 262 * No kmalloc array is necessary since objects of different sizes can
>> 263 * be allocated from the same page.
>> 264 */
>> 265 #define KMALLOC_SHIFT_HIGH PAGE_SHIFT
>> 266 #define KMALLOC_SHIFT_MAX (MAX_ORDER + PAGE_SHIFT - 1)
>> 267 #ifndef KMALLOC_SHIFT_LOW
>> 268 #define KMALLOC_SHIFT_LOW 3
>> 269 #endif
>> 270 #endif
533 271
534 /* Maximum allocatable size */ 272 /* Maximum allocatable size */
535 #define KMALLOC_MAX_SIZE (1UL << KMALLO 273 #define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_MAX)
536 /* Maximum size for which we actually use a sl 274 /* Maximum size for which we actually use a slab cache */
537 #define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLO 275 #define KMALLOC_MAX_CACHE_SIZE (1UL << KMALLOC_SHIFT_HIGH)
538 /* Maximum order allocatable via the slab allo !! 276 /* Maximum order allocatable via the slab allocagtor */
539 #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT 277 #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_MAX - PAGE_SHIFT)
540 278
541 /* 279 /*
542 * Kmalloc subsystem. 280 * Kmalloc subsystem.
543 */ 281 */
544 #ifndef KMALLOC_MIN_SIZE 282 #ifndef KMALLOC_MIN_SIZE
545 #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_L 283 #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW)
546 #endif 284 #endif
547 285
548 /* 286 /*
549 * This restriction comes from byte sized inde 287 * This restriction comes from byte sized index implementation.
550 * Page size is normally 2^12 bytes and, in th 288 * Page size is normally 2^12 bytes and, in this case, if we want to use
551 * byte sized index which can represent 2^8 en 289 * byte sized index which can represent 2^8 entries, the size of the object
552 * should be equal or greater to 2^12 / 2^8 = 290 * should be equal or greater to 2^12 / 2^8 = 2^4 = 16.
553 * If minimum size of kmalloc is less than 16, 291 * If minimum size of kmalloc is less than 16, we use it as minimum object
554 * size and give up to use byte sized index. 292 * size and give up to use byte sized index.
555 */ 293 */
556 #define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SI 294 #define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SIZE < 16 ? \
557 (KMALLOC_MIN_SI 295 (KMALLOC_MIN_SIZE) : 16)
558 296
559 #ifdef CONFIG_RANDOM_KMALLOC_CACHES !! 297 #ifndef CONFIG_SLOB
560 #define RANDOM_KMALLOC_CACHES_NR 15 // !! 298 extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
561 #else <<
562 #define RANDOM_KMALLOC_CACHES_NR 0 <<
563 #endif <<
564 <<
565 /* <<
566 * Whenever changing this, take care of that k <<
567 * create_kmalloc_caches() still work as inten <<
568 * <<
569 * KMALLOC_NORMAL can contain only unaccounted <<
570 * is for accounted but unreclaimable and non- <<
571 * kmem caches can have both accounted and una <<
572 */ <<
573 enum kmalloc_cache_type { <<
574 KMALLOC_NORMAL = 0, <<
575 #ifndef CONFIG_ZONE_DMA <<
576 KMALLOC_DMA = KMALLOC_NORMAL, <<
577 #endif <<
578 #ifndef CONFIG_MEMCG <<
579 KMALLOC_CGROUP = KMALLOC_NORMAL, <<
580 #endif <<
581 KMALLOC_RANDOM_START = KMALLOC_NORMAL, <<
582 KMALLOC_RANDOM_END = KMALLOC_RANDOM_ST <<
583 #ifdef CONFIG_SLUB_TINY <<
584 KMALLOC_RECLAIM = KMALLOC_NORMAL, <<
585 #else <<
586 KMALLOC_RECLAIM, <<
587 #endif <<
588 #ifdef CONFIG_ZONE_DMA 299 #ifdef CONFIG_ZONE_DMA
589 KMALLOC_DMA, !! 300 extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
590 #endif <<
591 #ifdef CONFIG_MEMCG <<
592 KMALLOC_CGROUP, <<
593 #endif <<
594 NR_KMALLOC_TYPES <<
595 }; <<
596 <<
597 typedef struct kmem_cache * kmem_buckets[KMALL <<
598 <<
599 extern kmem_buckets kmalloc_caches[NR_KMALLOC_ <<
600 <<
601 /* <<
602 * Define gfp bits that should not be set for <<
603 */ <<
604 #define KMALLOC_NOT_NORMAL_BITS <<
605 (__GFP_RECLAIMABLE | <<
606 (IS_ENABLED(CONFIG_ZONE_DMA) ? __GFP <<
607 (IS_ENABLED(CONFIG_MEMCG) ? __GFP_ACCO <<
608 <<
609 extern unsigned long random_kmalloc_seed; <<
610 <<
611 static __always_inline enum kmalloc_cache_type <<
612 { <<
613 /* <<
614 * The most common case is KMALLOC_NOR <<
615 * with a single branch for all the re <<
616 */ <<
617 if (likely((flags & KMALLOC_NOT_NORMAL <<
618 #ifdef CONFIG_RANDOM_KMALLOC_CACHES <<
619 /* RANDOM_KMALLOC_CACHES_NR (= <<
620 return KMALLOC_RANDOM_START + <<
621 <<
622 #else <<
623 return KMALLOC_NORMAL; <<
624 #endif 301 #endif
625 302
626 /* <<
627 * At least one of the flags has to be <<
628 * decreasing order are: <<
629 * 1) __GFP_DMA <<
630 * 2) __GFP_RECLAIMABLE <<
631 * 3) __GFP_ACCOUNT <<
632 */ <<
633 if (IS_ENABLED(CONFIG_ZONE_DMA) && (fl <<
634 return KMALLOC_DMA; <<
635 if (!IS_ENABLED(CONFIG_MEMCG) || (flag <<
636 return KMALLOC_RECLAIM; <<
637 else <<
638 return KMALLOC_CGROUP; <<
639 } <<
640 <<
641 /* 303 /*
642 * Figure out which kmalloc slab an allocation 304 * Figure out which kmalloc slab an allocation of a certain size
643 * belongs to. 305 * belongs to.
644 * 0 = zero alloc 306 * 0 = zero alloc
645 * 1 = 65 .. 96 bytes 307 * 1 = 65 .. 96 bytes
646 * 2 = 129 .. 192 bytes 308 * 2 = 129 .. 192 bytes
647 * n = 2^(n-1)+1 .. 2^n 309 * n = 2^(n-1)+1 .. 2^n
648 * <<
649 * Note: __kmalloc_index() is compile-time opt <<
650 * typical usage is via kmalloc_index() and th <<
651 * Callers where !size_is_constant should only <<
652 * overheads of __kmalloc_index() can be toler <<
653 */ 310 */
654 static __always_inline unsigned int __kmalloc_ !! 311 static __always_inline unsigned int kmalloc_index(size_t size)
655 <<
656 { 312 {
657 if (!size) 313 if (!size)
658 return 0; 314 return 0;
659 315
660 if (size <= KMALLOC_MIN_SIZE) 316 if (size <= KMALLOC_MIN_SIZE)
661 return KMALLOC_SHIFT_LOW; 317 return KMALLOC_SHIFT_LOW;
662 318
663 if (KMALLOC_MIN_SIZE <= 32 && size > 6 319 if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
664 return 1; 320 return 1;
665 if (KMALLOC_MIN_SIZE <= 64 && size > 1 321 if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
666 return 2; 322 return 2;
667 if (size <= 8) return 3; 323 if (size <= 8) return 3;
668 if (size <= 16) return 4; 324 if (size <= 16) return 4;
669 if (size <= 32) return 5; 325 if (size <= 32) return 5;
670 if (size <= 64) return 6; 326 if (size <= 64) return 6;
671 if (size <= 128) return 7; 327 if (size <= 128) return 7;
672 if (size <= 256) return 8; 328 if (size <= 256) return 8;
673 if (size <= 512) return 9; 329 if (size <= 512) return 9;
674 if (size <= 1024) return 10; 330 if (size <= 1024) return 10;
675 if (size <= 2 * 1024) return 11; 331 if (size <= 2 * 1024) return 11;
676 if (size <= 4 * 1024) return 12; 332 if (size <= 4 * 1024) return 12;
677 if (size <= 8 * 1024) return 13; 333 if (size <= 8 * 1024) return 13;
678 if (size <= 16 * 1024) return 14; 334 if (size <= 16 * 1024) return 14;
679 if (size <= 32 * 1024) return 15; 335 if (size <= 32 * 1024) return 15;
680 if (size <= 64 * 1024) return 16; 336 if (size <= 64 * 1024) return 16;
681 if (size <= 128 * 1024) return 17; 337 if (size <= 128 * 1024) return 17;
682 if (size <= 256 * 1024) return 18; 338 if (size <= 256 * 1024) return 18;
683 if (size <= 512 * 1024) return 19; 339 if (size <= 512 * 1024) return 19;
684 if (size <= 1024 * 1024) return 20; 340 if (size <= 1024 * 1024) return 20;
685 if (size <= 2 * 1024 * 1024) return 2 341 if (size <= 2 * 1024 * 1024) return 21;
686 !! 342 if (size <= 4 * 1024 * 1024) return 22;
687 if (!IS_ENABLED(CONFIG_PROFILE_ALL_BRA !! 343 if (size <= 8 * 1024 * 1024) return 23;
688 BUILD_BUG_ON_MSG(1, "unexpecte !! 344 if (size <= 16 * 1024 * 1024) return 24;
689 else !! 345 if (size <= 32 * 1024 * 1024) return 25;
690 BUG(); !! 346 if (size <= 64 * 1024 * 1024) return 26;
>> 347 BUG();
691 348
692 /* Will never be reached. Needed becau 349 /* Will never be reached. Needed because the compiler may complain */
693 return -1; 350 return -1;
694 } 351 }
695 static_assert(PAGE_SHIFT <= 20); !! 352 #endif /* !CONFIG_SLOB */
696 #define kmalloc_index(s) __kmalloc_index(s, tr <<
697 <<
698 #include <linux/alloc_tag.h> <<
699 353
700 /** !! 354 void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __malloc;
701 * kmem_cache_alloc - Allocate an object !! 355 void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags) __assume_slab_alignment __malloc;
702 * @cachep: The cache to allocate from. !! 356 void kmem_cache_free(struct kmem_cache *, void *);
703 * @flags: See kmalloc(). <<
704 * <<
705 * Allocate an object from this cache. <<
706 * See kmem_cache_zalloc() for a shortcut of a <<
707 * <<
708 * Return: pointer to the new object or %NULL <<
709 */ <<
710 void *kmem_cache_alloc_noprof(struct kmem_cach <<
711 gfp_t flags) __a <<
712 #define kmem_cache_alloc(...) <<
713 <<
714 void *kmem_cache_alloc_lru_noprof(struct kmem_ <<
715 gfp_t gfpflags) __ <<
716 #define kmem_cache_alloc_lru(...) alloc_ <<
717 <<
718 /** <<
719 * kmem_cache_charge - memcg charge an already <<
720 * @objp: address of the slab object to memcg <<
721 * @gfpflags: describe the allocation context <<
722 * <<
723 * kmem_cache_charge allows charging a slab ob <<
724 * primarily in cases where charging at alloca <<
725 * because the target memcg is not known (i.e. <<
726 * <<
727 * The objp should be pointer returned by the <<
728 * kmalloc (with __GFP_ACCOUNT in flags) or km <<
729 * behavior can be controlled through gfpflags <<
730 * necessary internal metadata can be allocate <<
731 * that overcharging is requested instead of f <<
732 * internal metadata allocation. <<
733 * <<
734 * There are several cases where it will retur <<
735 * not done: <<
736 * More specifically: <<
737 * <<
738 * 1. For !CONFIG_MEMCG or cgroup_disable=memo <<
739 * 2. Already charged slab objects. <<
740 * 3. For slab objects from KMALLOC_NORMAL cac <<
741 * without __GFP_ACCOUNT <<
742 * 4. Allocating internal metadata has failed <<
743 * <<
744 * Return: true if charge was successful other <<
745 */ <<
746 bool kmem_cache_charge(void *objp, gfp_t gfpfl <<
747 void kmem_cache_free(struct kmem_cache *s, voi <<
748 <<
749 kmem_buckets *kmem_buckets_create(const char * <<
750 unsigned int <<
751 void (*ctor) <<
752 357
753 /* 358 /*
754 * Bulk allocation and freeing operations. The 359 * Bulk allocation and freeing operations. These are accelerated in an
755 * allocator specific way to avoid taking lock 360 * allocator specific way to avoid taking locks repeatedly or building
756 * metadata structures unnecessarily. 361 * metadata structures unnecessarily.
757 * 362 *
758 * Note that interrupts must be enabled when c 363 * Note that interrupts must be enabled when calling these functions.
759 */ 364 */
760 void kmem_cache_free_bulk(struct kmem_cache *s !! 365 void kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
761 !! 366 int kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
762 int kmem_cache_alloc_bulk_noprof(struct kmem_c <<
763 #define kmem_cache_alloc_bulk(...) alloc_ <<
764 367
>> 368 /*
>> 369 * Caller must not use kfree_bulk() on memory not originally allocated
>> 370 * by kmalloc(), because the SLOB allocator cannot handle this.
>> 371 */
765 static __always_inline void kfree_bulk(size_t 372 static __always_inline void kfree_bulk(size_t size, void **p)
766 { 373 {
767 kmem_cache_free_bulk(NULL, size, p); 374 kmem_cache_free_bulk(NULL, size, p);
768 } 375 }
769 376
770 void *kmem_cache_alloc_node_noprof(struct kmem !! 377 #ifdef CONFIG_NUMA
771 int node) _ !! 378 void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment __malloc;
772 #define kmem_cache_alloc_node(...) alloc_ !! 379 void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node) __assume_slab_alignment __malloc;
773 <<
774 /* <<
775 * These macros allow declaring a kmem_buckets <<
776 * can be compiled out with CONFIG_SLAB_BUCKET <<
777 * sites don't have to pass NULL. <<
778 */ <<
779 #ifdef CONFIG_SLAB_BUCKETS <<
780 #define DECL_BUCKET_PARAMS(_size, _b) size_t <<
781 #define PASS_BUCKET_PARAMS(_size, _b) (_size <<
782 #define PASS_BUCKET_PARAM(_b) (_b) <<
783 #else 380 #else
784 #define DECL_BUCKET_PARAMS(_size, _b) size_t !! 381 static __always_inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
785 #define PASS_BUCKET_PARAMS(_size, _b) (_size !! 382 {
786 #define PASS_BUCKET_PARAM(_b) NULL !! 383 return __kmalloc(size, flags);
>> 384 }
>> 385
>> 386 static __always_inline void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node)
>> 387 {
>> 388 return kmem_cache_alloc(s, flags);
>> 389 }
787 #endif 390 #endif
788 391
789 /* !! 392 #ifdef CONFIG_TRACING
790 * The following functions are not to be used !! 393 extern void *kmem_cache_alloc_trace(struct kmem_cache *, gfp_t, size_t) __assume_slab_alignment __malloc;
791 * for internal use from kmalloc() and kmalloc <<
792 * with the exception of kunit tests <<
793 */ <<
794 394
795 void *__kmalloc_noprof(size_t size, gfp_t flag !! 395 #ifdef CONFIG_NUMA
796 __assume_kmall !! 396 extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
>> 397 gfp_t gfpflags,
>> 398 int node, size_t size) __assume_slab_alignment __malloc;
>> 399 #else
>> 400 static __always_inline void *
>> 401 kmem_cache_alloc_node_trace(struct kmem_cache *s,
>> 402 gfp_t gfpflags,
>> 403 int node, size_t size)
>> 404 {
>> 405 return kmem_cache_alloc_trace(s, gfpflags, size);
>> 406 }
>> 407 #endif /* CONFIG_NUMA */
797 408
798 void *__kmalloc_node_noprof(DECL_BUCKET_PARAMS !! 409 #else /* CONFIG_TRACING */
799 __assume_kmall !! 410 static __always_inline void *kmem_cache_alloc_trace(struct kmem_cache *s,
>> 411 gfp_t flags, size_t size)
>> 412 {
>> 413 void *ret = kmem_cache_alloc(s, flags);
800 414
801 void *__kmalloc_cache_noprof(struct kmem_cache !! 415 kasan_kmalloc(s, ret, size, flags);
802 __assume_kmall !! 416 return ret;
>> 417 }
803 418
804 void *__kmalloc_cache_node_noprof(struct kmem_ !! 419 static __always_inline void *
805 int node, si !! 420 kmem_cache_alloc_node_trace(struct kmem_cache *s,
806 __assume_kmall !! 421 gfp_t gfpflags,
>> 422 int node, size_t size)
>> 423 {
>> 424 void *ret = kmem_cache_alloc_node(s, gfpflags, node);
>> 425
>> 426 kasan_kmalloc(s, ret, size, gfpflags);
>> 427 return ret;
>> 428 }
>> 429 #endif /* CONFIG_TRACING */
807 430
808 void *__kmalloc_large_noprof(size_t size, gfp_ !! 431 extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment __malloc;
809 __assume_page_ <<
810 432
811 void *__kmalloc_large_node_noprof(size_t size, !! 433 #ifdef CONFIG_TRACING
812 __assume_page_ !! 434 extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment __malloc;
>> 435 #else
>> 436 static __always_inline void *
>> 437 kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
>> 438 {
>> 439 return kmalloc_order(size, flags, order);
>> 440 }
>> 441 #endif
>> 442
>> 443 static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
>> 444 {
>> 445 unsigned int order = get_order(size);
>> 446 return kmalloc_order_trace(size, flags, order);
>> 447 }
813 448
814 /** 449 /**
815 * kmalloc - allocate kernel memory !! 450 * kmalloc - allocate memory
816 * @size: how many bytes of memory are require 451 * @size: how many bytes of memory are required.
817 * @flags: describe the allocation context !! 452 * @flags: the type of memory to allocate.
818 * 453 *
819 * kmalloc is the normal method of allocating 454 * kmalloc is the normal method of allocating memory
820 * for objects smaller than page size in the k 455 * for objects smaller than page size in the kernel.
821 * 456 *
822 * The allocated object address is aligned to !! 457 * The @flags argument may be one of:
823 * bytes. For @size of power of two bytes, the !! 458 *
824 * to be at least to the size. For other sizes !! 459 * %GFP_USER - Allocate memory on behalf of user. May sleep.
825 * be at least the largest power-of-two diviso !! 460 *
>> 461 * %GFP_KERNEL - Allocate normal kernel ram. May sleep.
>> 462 *
>> 463 * %GFP_ATOMIC - Allocation will not sleep. May use emergency pools.
>> 464 * For example, use this inside interrupt handlers.
826 * 465 *
827 * The @flags argument may be one of the GFP f !! 466 * %GFP_HIGHUSER - Allocate pages from high memory.
828 * include/linux/gfp_types.h and described at <<
829 * :ref:`Documentation/core-api/mm-api.rst <mm <<
830 * 467 *
831 * The recommended usage of the @flags is desc !! 468 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
832 * :ref:`Documentation/core-api/memory-allocat <<
833 * 469 *
834 * Below is a brief outline of the most useful !! 470 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
835 * 471 *
836 * %GFP_KERNEL !! 472 * %GFP_NOWAIT - Allocation will not sleep.
837 * Allocate normal kernel ram. May sleep. <<
838 * 473 *
839 * %GFP_NOWAIT !! 474 * %__GFP_THISNODE - Allocate node-local memory only.
840 * Allocation will not sleep. <<
841 * 475 *
842 * %GFP_ATOMIC !! 476 * %GFP_DMA - Allocation suitable for DMA.
843 * Allocation will not sleep. May use em !! 477 * Should only be used for kmalloc() caches. Otherwise, use a
>> 478 * slab created with SLAB_DMA.
844 * 479 *
845 * Also it is possible to set different flags 480 * Also it is possible to set different flags by OR'ing
846 * in one or more of the following additional 481 * in one or more of the following additional @flags:
847 * 482 *
848 * %__GFP_ZERO !! 483 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
849 * Zero the allocated memory before retur <<
850 * 484 *
851 * %__GFP_HIGH !! 485 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
852 * This allocation has high priority and !! 486 * (think twice before using).
853 * 487 *
854 * %__GFP_NOFAIL !! 488 * %__GFP_NORETRY - If memory is not immediately available,
855 * Indicate that this allocation is in no !! 489 * then give up at once.
856 * (think twice before using). <<
857 * 490 *
858 * %__GFP_NORETRY !! 491 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
859 * If memory is not immediately available <<
860 * then give up at once. <<
861 * 492 *
862 * %__GFP_NOWARN !! 493 * %__GFP_RETRY_MAYFAIL - Try really hard to succeed the allocation but fail
863 * If allocation fails, don't issue any w !! 494 * eventually.
864 * 495 *
865 * %__GFP_RETRY_MAYFAIL !! 496 * There are other flags available as well, but these are not intended
866 * Try really hard to succeed the allocat !! 497 * for general use, and so are not documented here. For a full list of
867 * eventually. !! 498 * potential flags, always refer to linux/gfp.h.
868 */ 499 */
869 static __always_inline __alloc_size(1) void *k !! 500 static __always_inline void *kmalloc(size_t size, gfp_t flags)
870 { 501 {
871 if (__builtin_constant_p(size) && size !! 502 if (__builtin_constant_p(size)) {
872 unsigned int index; <<
873 <<
874 if (size > KMALLOC_MAX_CACHE_S 503 if (size > KMALLOC_MAX_CACHE_SIZE)
875 return __kmalloc_large !! 504 return kmalloc_large(size, flags);
876 !! 505 #ifndef CONFIG_SLOB
877 index = kmalloc_index(size); !! 506 if (!(flags & GFP_DMA)) {
878 return __kmalloc_cache_noprof( !! 507 unsigned int index = kmalloc_index(size);
879 kmalloc_caches !! 508
880 flags, size); !! 509 if (!index)
>> 510 return ZERO_SIZE_PTR;
>> 511
>> 512 return kmem_cache_alloc_trace(kmalloc_caches[index],
>> 513 flags, size);
>> 514 }
>> 515 #endif
881 } 516 }
882 return __kmalloc_noprof(size, flags); !! 517 return __kmalloc(size, flags);
883 } 518 }
884 #define kmalloc(...) <<
885 519
886 #define kmem_buckets_alloc(_b, _size, _flags) !! 520 /*
887 alloc_hooks(__kmalloc_node_noprof(PASS !! 521 * Determine size used for the nth kmalloc cache.
>> 522 * return size or 0 if a kmalloc cache for that
>> 523 * size does not exist
>> 524 */
>> 525 static __always_inline unsigned int kmalloc_size(unsigned int n)
>> 526 {
>> 527 #ifndef CONFIG_SLOB
>> 528 if (n > 2)
>> 529 return 1U << n;
888 530
889 #define kmem_buckets_alloc_track_caller(_b, _s !! 531 if (n == 1 && KMALLOC_MIN_SIZE <= 32)
890 alloc_hooks(__kmalloc_node_track_calle !! 532 return 96;
>> 533
>> 534 if (n == 2 && KMALLOC_MIN_SIZE <= 64)
>> 535 return 192;
>> 536 #endif
>> 537 return 0;
>> 538 }
891 539
892 static __always_inline __alloc_size(1) void *k !! 540 static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
893 { 541 {
894 if (__builtin_constant_p(size) && size !! 542 #ifndef CONFIG_SLOB
895 unsigned int index; !! 543 if (__builtin_constant_p(size) &&
>> 544 size <= KMALLOC_MAX_CACHE_SIZE && !(flags & GFP_DMA)) {
>> 545 unsigned int i = kmalloc_index(size);
896 546
897 if (size > KMALLOC_MAX_CACHE_S !! 547 if (!i)
898 return __kmalloc_large !! 548 return ZERO_SIZE_PTR;
899 549
900 index = kmalloc_index(size); !! 550 return kmem_cache_alloc_node_trace(kmalloc_caches[i],
901 return __kmalloc_cache_node_no !! 551 flags, node, size);
902 kmalloc_caches <<
903 flags, node, s <<
904 } 552 }
905 return __kmalloc_node_noprof(PASS_BUCK !! 553 #endif
>> 554 return __kmalloc_node(size, flags, node);
906 } 555 }
907 #define kmalloc_node(...) !! 556
>> 557 struct memcg_cache_array {
>> 558 struct rcu_head rcu;
>> 559 struct kmem_cache *entries[0];
>> 560 };
>> 561
>> 562 /*
>> 563 * This is the main placeholder for memcg-related information in kmem caches.
>> 564 * Both the root cache and the child caches will have it. For the root cache,
>> 565 * this will hold a dynamically allocated array large enough to hold
>> 566 * information about the currently limited memcgs in the system. To allow the
>> 567 * array to be accessed without taking any locks, on relocation we free the old
>> 568 * version only after a grace period.
>> 569 *
>> 570 * Root and child caches hold different metadata.
>> 571 *
>> 572 * @root_cache: Common to root and child caches. NULL for root, pointer to
>> 573 * the root cache for children.
>> 574 *
>> 575 * The following fields are specific to root caches.
>> 576 *
>> 577 * @memcg_caches: kmemcg ID indexed table of child caches. This table is
>> 578 * used to index child cachces during allocation and cleared
>> 579 * early during shutdown.
>> 580 *
>> 581 * @root_caches_node: List node for slab_root_caches list.
>> 582 *
>> 583 * @children: List of all child caches. While the child caches are also
>> 584 * reachable through @memcg_caches, a child cache remains on
>> 585 * this list until it is actually destroyed.
>> 586 *
>> 587 * The following fields are specific to child caches.
>> 588 *
>> 589 * @memcg: Pointer to the memcg this cache belongs to.
>> 590 *
>> 591 * @children_node: List node for @root_cache->children list.
>> 592 *
>> 593 * @kmem_caches_node: List node for @memcg->kmem_caches list.
>> 594 */
>> 595 struct memcg_cache_params {
>> 596 struct kmem_cache *root_cache;
>> 597 union {
>> 598 struct {
>> 599 struct memcg_cache_array __rcu *memcg_caches;
>> 600 struct list_head __root_caches_node;
>> 601 struct list_head children;
>> 602 };
>> 603 struct {
>> 604 struct mem_cgroup *memcg;
>> 605 struct list_head children_node;
>> 606 struct list_head kmem_caches_node;
>> 607
>> 608 void (*deact_fn)(struct kmem_cache *);
>> 609 union {
>> 610 struct rcu_head deact_rcu_head;
>> 611 struct work_struct deact_work;
>> 612 };
>> 613 };
>> 614 };
>> 615 };
>> 616
>> 617 int memcg_update_all_caches(int num_memcgs);
908 618
909 /** 619 /**
910 * kmalloc_array - allocate memory for an arra 620 * kmalloc_array - allocate memory for an array.
911 * @n: number of elements. 621 * @n: number of elements.
912 * @size: element size. 622 * @size: element size.
913 * @flags: the type of memory to allocate (see 623 * @flags: the type of memory to allocate (see kmalloc).
914 */ 624 */
915 static inline __alloc_size(1, 2) void *kmalloc !! 625 static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
916 { 626 {
917 size_t bytes; !! 627 if (size != 0 && n > SIZE_MAX / size)
918 <<
919 if (unlikely(check_mul_overflow(n, siz <<
920 return NULL; 628 return NULL;
921 if (__builtin_constant_p(n) && __built 629 if (__builtin_constant_p(n) && __builtin_constant_p(size))
922 return kmalloc_noprof(bytes, f !! 630 return kmalloc(n * size, flags);
923 return kmalloc_noprof(bytes, flags); !! 631 return __kmalloc(n * size, flags);
924 } <<
925 #define kmalloc_array(...) <<
926 <<
927 /** <<
928 * krealloc_array - reallocate memory for an a <<
929 * @p: pointer to the memory chunk to realloca <<
930 * @new_n: new number of elements to alloc <<
931 * @new_size: new size of a single member of t <<
932 * @flags: the type of memory to allocate (see <<
933 * <<
934 * If __GFP_ZERO logic is requested, callers m <<
935 * initial memory allocation, every subsequent <<
936 * memory allocation is flagged with __GFP_ZER <<
937 * __GFP_ZERO is not fully honored by this API <<
938 * <<
939 * See krealloc_noprof() for further details. <<
940 * <<
941 * In any case, the contents of the object poi <<
942 * lesser of the new and old sizes. <<
943 */ <<
944 static inline __realloc_size(2, 3) void * __mu <<
945 <<
946 <<
947 <<
948 { <<
949 size_t bytes; <<
950 <<
951 if (unlikely(check_mul_overflow(new_n, <<
952 return NULL; <<
953 <<
954 return krealloc_noprof(p, bytes, flags <<
955 } 632 }
956 #define krealloc_array(...) <<
957 633
958 /** 634 /**
959 * kcalloc - allocate memory for an array. The 635 * kcalloc - allocate memory for an array. The memory is set to zero.
960 * @n: number of elements. 636 * @n: number of elements.
961 * @size: element size. 637 * @size: element size.
962 * @flags: the type of memory to allocate (see 638 * @flags: the type of memory to allocate (see kmalloc).
963 */ 639 */
964 #define kcalloc(n, size, flags) kmallo !! 640 static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
965 !! 641 {
966 void *__kmalloc_node_track_caller_noprof(DECL_ !! 642 return kmalloc_array(n, size, flags | __GFP_ZERO);
967 unsig !! 643 }
968 #define kmalloc_node_track_caller_noprof(size, <<
969 __kmalloc_node_track_caller_noprof(PAS <<
970 #define kmalloc_node_track_caller(...) <<
971 alloc_hooks(kmalloc_node_track_caller_ <<
972 644
973 /* 645 /*
974 * kmalloc_track_caller is a special version o 646 * kmalloc_track_caller is a special version of kmalloc that records the
975 * calling function of the routine calling it 647 * calling function of the routine calling it for slab leak tracking instead
976 * of just the calling function (confusing, eh 648 * of just the calling function (confusing, eh?).
977 * It's useful when the call to kmalloc comes 649 * It's useful when the call to kmalloc comes from a widely-used standard
978 * allocator where we care about the real plac 650 * allocator where we care about the real place the memory allocation
979 * request comes from. 651 * request comes from.
980 */ 652 */
981 #define kmalloc_track_caller(...) !! 653 extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
>> 654 #define kmalloc_track_caller(size, flags) \
>> 655 __kmalloc_track_caller(size, flags, _RET_IP_)
982 656
983 #define kmalloc_track_caller_noprof(...) !! 657 static inline void *kmalloc_array_node(size_t n, size_t size, gfp_t flags,
984 kmalloc_node_track_caller_nopr !! 658 int node)
985 <<
986 static inline __alloc_size(1, 2) void *kmalloc <<
987 <<
988 { 659 {
989 size_t bytes; !! 660 if (size != 0 && n > SIZE_MAX / size)
990 <<
991 if (unlikely(check_mul_overflow(n, siz <<
992 return NULL; 661 return NULL;
993 if (__builtin_constant_p(n) && __built 662 if (__builtin_constant_p(n) && __builtin_constant_p(size))
994 return kmalloc_node_noprof(byt !! 663 return kmalloc_node(n * size, flags, node);
995 return __kmalloc_node_noprof(PASS_BUCK !! 664 return __kmalloc_node(n * size, flags, node);
>> 665 }
>> 666
>> 667 static inline void *kcalloc_node(size_t n, size_t size, gfp_t flags, int node)
>> 668 {
>> 669 return kmalloc_array_node(n, size, flags | __GFP_ZERO, node);
996 } 670 }
997 #define kmalloc_array_node(...) <<
998 671
999 #define kcalloc_node(_n, _size, _flags, _node) !! 672
1000 kmalloc_array_node(_n, _size, (_flags !! 673 #ifdef CONFIG_NUMA
>> 674 extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
>> 675 #define kmalloc_node_track_caller(size, flags, node) \
>> 676 __kmalloc_node_track_caller(size, flags, node, \
>> 677 _RET_IP_)
>> 678
>> 679 #else /* CONFIG_NUMA */
>> 680
>> 681 #define kmalloc_node_track_caller(size, flags, node) \
>> 682 kmalloc_track_caller(size, flags)
>> 683
>> 684 #endif /* CONFIG_NUMA */
1001 685
1002 /* 686 /*
1003 * Shortcuts 687 * Shortcuts
1004 */ 688 */
1005 #define kmem_cache_zalloc(_k, _flags) !! 689 static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags)
>> 690 {
>> 691 return kmem_cache_alloc(k, flags | __GFP_ZERO);
>> 692 }
1006 693
1007 /** 694 /**
1008 * kzalloc - allocate memory. The memory is s 695 * kzalloc - allocate memory. The memory is set to zero.
1009 * @size: how many bytes of memory are requir 696 * @size: how many bytes of memory are required.
1010 * @flags: the type of memory to allocate (se 697 * @flags: the type of memory to allocate (see kmalloc).
1011 */ 698 */
1012 static inline __alloc_size(1) void *kzalloc_n !! 699 static inline void *kzalloc(size_t size, gfp_t flags)
1013 { 700 {
1014 return kmalloc_noprof(size, flags | _ !! 701 return kmalloc(size, flags | __GFP_ZERO);
1015 } 702 }
1016 #define kzalloc(...) <<
1017 #define kzalloc_node(_size, _flags, _node) <<
1018 <<
1019 void *__kvmalloc_node_noprof(DECL_BUCKET_PARA <<
1020 #define kvmalloc_node_noprof(size, flags, nod <<
1021 __kvmalloc_node_noprof(PASS_BUCKET_PA <<
1022 #define kvmalloc_node(...) <<
1023 <<
1024 #define kvmalloc(_size, _flags) <<
1025 #define kvmalloc_noprof(_size, _flags) <<
1026 #define kvzalloc(_size, _flags) <<
1027 <<
1028 #define kvzalloc_node(_size, _flags, _node) <<
1029 #define kmem_buckets_valloc(_b, _size, _flags <<
1030 alloc_hooks(__kvmalloc_node_noprof(PA <<
1031 703
1032 static inline __alloc_size(1, 2) void * !! 704 /**
1033 kvmalloc_array_node_noprof(size_t n, size_t s !! 705 * kzalloc_node - allocate zeroed memory from a particular memory node.
>> 706 * @size: how many bytes of memory are required.
>> 707 * @flags: the type of memory to allocate (see kmalloc).
>> 708 * @node: memory node from which to allocate
>> 709 */
>> 710 static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
1034 { 711 {
1035 size_t bytes; !! 712 return kmalloc_node(size, flags | __GFP_ZERO, node);
1036 <<
1037 if (unlikely(check_mul_overflow(n, si <<
1038 return NULL; <<
1039 <<
1040 return kvmalloc_node_noprof(bytes, fl <<
1041 } 713 }
1042 714
1043 #define kvmalloc_array_noprof(...) <<
1044 #define kvcalloc_node_noprof(_n,_s,_f,_node) <<
1045 #define kvcalloc_noprof(...) <<
1046 <<
1047 #define kvmalloc_array(...) <<
1048 #define kvcalloc_node(...) <<
1049 #define kvcalloc(...) <<
1050 <<
1051 void *kvrealloc_noprof(const void *p, size_t <<
1052 __realloc_size(2); <<
1053 #define kvrealloc(...) <<
1054 <<
1055 extern void kvfree(const void *addr); <<
1056 DEFINE_FREE(kvfree, void *, if (!IS_ERR_OR_NU <<
1057 <<
1058 extern void kvfree_sensitive(const void *addr <<
1059 <<
1060 unsigned int kmem_cache_size(struct kmem_cach 715 unsigned int kmem_cache_size(struct kmem_cache *s);
1061 <<
1062 /** <<
1063 * kmalloc_size_roundup - Report allocation b <<
1064 * <<
1065 * @size: Number of bytes to round up from. <<
1066 * <<
1067 * This returns the number of bytes that woul <<
1068 * allocation of @size bytes. For example, a <<
1069 * rounded up to the next sized kmalloc bucke <<
1070 * for the general-purpose kmalloc()-based al <<
1071 * pre-sized kmem_cache_alloc()-based allocat <<
1072 * <<
1073 * Use this to kmalloc() the full bucket size <<
1074 * ksize() to query the size after an allocat <<
1075 */ <<
1076 size_t kmalloc_size_roundup(size_t size); <<
1077 <<
1078 void __init kmem_cache_init_late(void); 716 void __init kmem_cache_init_late(void);
>> 717
>> 718 #if defined(CONFIG_SMP) && defined(CONFIG_SLAB)
>> 719 int slab_prepare_cpu(unsigned int cpu);
>> 720 int slab_dead_cpu(unsigned int cpu);
>> 721 #else
>> 722 #define slab_prepare_cpu NULL
>> 723 #define slab_dead_cpu NULL
>> 724 #endif
1079 725
1080 #endif /* _LINUX_SLAB_H */ 726 #endif /* _LINUX_SLAB_H */
1081 727
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