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 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Written by Mark Hemment, 1996 (markhe@nextd.demon.co.uk).
  *
  * (C) SGI 2006, Christoph Lameter
  *  Cleaned up and restructured to ease the addition of alternative
  *  implementations of SLAB allocators.
  * (C) Linux Foundation 2008-2013
  *      Unified interface for all slab allocators
  */
 
 #ifndef _LINUX_SLAB_H
 #define _LINUX_SLAB_H
 
 #include <linux/gfp.h>
 #include <linux/overflow.h>
 #include <linux/types.h>
 #include <linux/workqueue.h>
 #include <linux/percpu-refcount.h>
 
 
 /*
  * Flags to pass to kmem_cache_create().
  * The ones marked DEBUG are only valid if CONFIG_DEBUG_SLAB is set.
  */
 /* DEBUG: Perform (expensive) checks on alloc/free */
 #define SLAB_CONSISTENCY_CHECKS ((slab_flags_t __force)0x00000100U)
 /* DEBUG: Red zone objs in a cache */
 #define SLAB_RED_ZONE       ((slab_flags_t __force)0x00000400U)
 /* DEBUG: Poison objects */
 #define SLAB_POISON     ((slab_flags_t __force)0x00000800U)
 /* Align objs on cache lines */
 #define SLAB_HWCACHE_ALIGN  ((slab_flags_t __force)0x00002000U)
 /* Use GFP_DMA memory */
 #define SLAB_CACHE_DMA      ((slab_flags_t __force)0x00004000U)
 /* Use GFP_DMA32 memory */
 #define SLAB_CACHE_DMA32    ((slab_flags_t __force)0x00008000U)
 /* DEBUG: Store the last owner for bug hunting */
 #define SLAB_STORE_USER     ((slab_flags_t __force)0x00010000U)
 /* Panic if kmem_cache_create() fails */
 #define SLAB_PANIC      ((slab_flags_t __force)0x00040000U)
 /*
  * SLAB_TYPESAFE_BY_RCU - **WARNING** READ THIS!
  *
  * This delays freeing the SLAB page by a grace period, it does _NOT_
  * delay object freeing. This means that if you do kmem_cache_free()
  * that memory location is free to be reused at any time. Thus it may
  * be possible to see another object there in the same RCU grace period.
  *
  * This feature only ensures the memory location backing the object
  * stays valid, the trick to using this is relying on an independent
  * object validation pass. Something like:
  *
  *  rcu_read_lock()
  * again:
  *  obj = lockless_lookup(key);
  *  if (obj) {
  *    if (!try_get_ref(obj)) // might fail for free objects
  *      goto again;
  *
  *    if (obj->key != key) { // not the object we expected
  *      put_ref(obj);
  *      goto again;
  *    }
  *  }
  *  rcu_read_unlock();
  *
  * This is useful if we need to approach a kernel structure obliquely,
  * from its address obtained without the usual locking. We can lock
  * the structure to stabilize it and check it's still at the given address,
  * only if we can be sure that the memory has not been meanwhile reused
  * for some other kind of object (which our subsystem's lock might corrupt).
  *
  * rcu_read_lock before reading the address, then rcu_read_unlock after
  * taking the spinlock within the structure expected at that address.
  *
  * Note that SLAB_TYPESAFE_BY_RCU was originally named SLAB_DESTROY_BY_RCU.
  */
 /* Defer freeing slabs to RCU */
 #define SLAB_TYPESAFE_BY_RCU    ((slab_flags_t __force)0x00080000U)
 /* Spread some memory over cpuset */
 #define SLAB_MEM_SPREAD     ((slab_flags_t __force)0x00100000U)
 /* Trace allocations and frees */
 #define SLAB_TRACE      ((slab_flags_t __force)0x00200000U)
 
 /* Flag to prevent checks on free */
 #ifdef CONFIG_DEBUG_OBJECTS
 # define SLAB_DEBUG_OBJECTS ((slab_flags_t __force)0x00400000U)
 #else
 # define SLAB_DEBUG_OBJECTS 0
 #endif
 
 /* Avoid kmemleak tracing */
 #define SLAB_NOLEAKTRACE    ((slab_flags_t __force)0x00800000U)
 
 /* Fault injection mark */
 #ifdef CONFIG_FAILSLAB
 # define SLAB_FAILSLAB      ((slab_flags_t __force)0x02000000U)
 #else
 # define SLAB_FAILSLAB      0
 #endif
 /* Account to memcg */
 #ifdef CONFIG_MEMCG_KMEM
 # define SLAB_ACCOUNT       ((slab_flags_t __force)0x04000000U)
 #else
 # define SLAB_ACCOUNT       0
 #endif
 
 #ifdef CONFIG_KASAN
 #define SLAB_KASAN      ((slab_flags_t __force)0x08000000U)
 #else
 #define SLAB_KASAN      0
 #endif
 
 /*
  * Ignore user specified debugging flags.
  * Intended for caches created for self-tests so they have only flags
  * specified in the code and other flags are ignored.
  */
 #define SLAB_NO_USER_FLAGS  ((slab_flags_t __force)0x10000000U)
 
 /* The following flags affect the page allocator grouping pages by mobility */
 /* Objects are reclaimable */
 #define SLAB_RECLAIM_ACCOUNT    ((slab_flags_t __force)0x00020000U)
 #define SLAB_TEMPORARY      SLAB_RECLAIM_ACCOUNT    /* Objects are short-lived */
 
 /*
  * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
  *
  * Dereferencing ZERO_SIZE_PTR will lead to a distinct access fault.
  *
  * ZERO_SIZE_PTR can be passed to kfree though in the same way that NULL can.
  * Both make kfree a no-op.
  */
 #define ZERO_SIZE_PTR ((void *)16)
 
 #define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) <= \
                 (unsigned long)ZERO_SIZE_PTR)
 
 #include <linux/kasan.h>
 
 struct list_lru;
 struct mem_cgroup;
 /*
  * struct kmem_cache related prototypes
  */
 void __init kmem_cache_init(void);
 bool slab_is_available(void);
 
 struct kmem_cache *kmem_cache_create(const char *name, unsigned int size,
             unsigned int align, slab_flags_t flags,
             void (*ctor)(void *));
 struct kmem_cache *kmem_cache_create_usercopy(const char *name,
             unsigned int size, unsigned int align,
             slab_flags_t flags,
             unsigned int useroffset, unsigned int usersize,
             void (*ctor)(void *));
 void kmem_cache_destroy(struct kmem_cache *s);
 int kmem_cache_shrink(struct kmem_cache *s);
 
 /*
  * Please use this macro to create slab caches. Simply specify the
  * name of the structure and maybe some flags that are listed above.
  *
  * The alignment of the struct determines object alignment. If you
  * f.e. add ____cacheline_aligned_in_smp to the struct declaration
  * then the objects will be properly aligned in SMP configurations.
  */
 #define KMEM_CACHE(__struct, __flags)                   \
         kmem_cache_create(#__struct, sizeof(struct __struct),   \
             __alignof__(struct __struct), (__flags), NULL)
 
 /*
  * To whitelist a single field for copying to/from usercopy, use this
  * macro instead for KMEM_CACHE() above.
  */
 #define KMEM_CACHE_USERCOPY(__struct, __flags, __field)         \
         kmem_cache_create_usercopy(#__struct,           \
             sizeof(struct __struct),            \
             __alignof__(struct __struct), (__flags),    \
             offsetof(struct __struct, __field),     \
             sizeof_field(struct __struct, __field), NULL)
 
 /*
  * Common kmalloc functions provided by all allocators
  */
 void * __must_check krealloc(const void *objp, size_t new_size, gfp_t flags) __alloc_size(2);
 void kfree(const void *objp);
 void kfree_sensitive(const void *objp);
 size_t __ksize(const void *objp);
 size_t ksize(const void *objp);
 #ifdef CONFIG_PRINTK
 bool kmem_valid_obj(void *object);
 void kmem_dump_obj(void *object);
 #endif
 
 /*
  * Some archs want to perform DMA into kmalloc caches and need a guaranteed
  * alignment larger than the alignment of a 64-bit integer.
  * Setting ARCH_DMA_MINALIGN in arch headers allows that.
  */
 #if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8
 #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
 #define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN
 #define KMALLOC_SHIFT_LOW ilog2(ARCH_DMA_MINALIGN)
 #else
 #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
 #endif
 
 /*
  * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment.
  * Intended for arches that get misalignment faults even for 64 bit integer
  * aligned buffers.
  */
 #ifndef ARCH_SLAB_MINALIGN
 #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
 #endif
 
 /*
  * Arches can define this function if they want to decide the minimum slab
  * alignment at runtime. The value returned by the function must be a power
  * of two and >= ARCH_SLAB_MINALIGN.
  */
 #ifndef arch_slab_minalign
 static inline unsigned int arch_slab_minalign(void)
 {
     return ARCH_SLAB_MINALIGN;
 }
 #endif
 
 /*
  * kmem_cache_alloc and friends return pointers aligned to ARCH_SLAB_MINALIGN.
  * kmalloc and friends return pointers aligned to both ARCH_KMALLOC_MINALIGN
  * and ARCH_SLAB_MINALIGN, but here we only assume the former alignment.
  */
 #define __assume_kmalloc_alignment __assume_aligned(ARCH_KMALLOC_MINALIGN)
 #define __assume_slab_alignment __assume_aligned(ARCH_SLAB_MINALIGN)
 #define __assume_page_alignment __assume_aligned(PAGE_SIZE)
 
 /*
  * Kmalloc array related definitions
  */
 
 #ifdef CONFIG_SLAB
 /*
  * The largest kmalloc size supported by the SLAB allocators is
  * 32 megabyte (2^25) or the maximum allocatable page order if that is
  * less than 32 MB.
  *
  * WARNING: Its not easy to increase this value since the allocators have
  * to do various tricks to work around compiler limitations in order to
  * ensure proper constant folding.
  */
 #define KMALLOC_SHIFT_HIGH  ((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
                 (MAX_ORDER + PAGE_SHIFT - 1) : 25)
 #define KMALLOC_SHIFT_MAX   KMALLOC_SHIFT_HIGH
 #ifndef KMALLOC_SHIFT_LOW
 #define KMALLOC_SHIFT_LOW   5
 #endif
 #endif
 
 #ifdef CONFIG_SLUB
 /*
  * SLUB directly allocates requests fitting in to an order-1 page
  * (PAGE_SIZE*2).  Larger requests are passed to the page allocator.
  */
 #define KMALLOC_SHIFT_HIGH  (PAGE_SHIFT + 1)
 #define KMALLOC_SHIFT_MAX   (MAX_ORDER + PAGE_SHIFT - 1)
 #ifndef KMALLOC_SHIFT_LOW
 #define KMALLOC_SHIFT_LOW   3
 #endif
 #endif
 
 #ifdef CONFIG_SLOB
 /*
  * SLOB passes all requests larger than one page to the page allocator.
  * No kmalloc array is necessary since objects of different sizes can
  * be allocated from the same page.
  */
 #define KMALLOC_SHIFT_HIGH  PAGE_SHIFT
 #define KMALLOC_SHIFT_MAX   (MAX_ORDER + PAGE_SHIFT - 1)
 #ifndef KMALLOC_SHIFT_LOW
 #define KMALLOC_SHIFT_LOW   3
 #endif
 #endif
 
 /* Maximum allocatable size */
 #define KMALLOC_MAX_SIZE    (1UL << KMALLOC_SHIFT_MAX)
 /* Maximum size for which we actually use a slab cache */
 #define KMALLOC_MAX_CACHE_SIZE  (1UL << KMALLOC_SHIFT_HIGH)
 /* Maximum order allocatable via the slab allocator */
 #define KMALLOC_MAX_ORDER   (KMALLOC_SHIFT_MAX - PAGE_SHIFT)
 
 /*
  * Kmalloc subsystem.
  */
 #ifndef KMALLOC_MIN_SIZE
 #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW)
 #endif
 
 /*
  * This restriction comes from byte sized index implementation.
  * Page size is normally 2^12 bytes and, in this case, if we want to use
  * byte sized index which can represent 2^8 entries, the size of the object
  * should be equal or greater to 2^12 / 2^8 = 2^4 = 16.
  * If minimum size of kmalloc is less than 16, we use it as minimum object
  * size and give up to use byte sized index.
  */
 #define SLAB_OBJ_MIN_SIZE      (KMALLOC_MIN_SIZE < 16 ? \
                                (KMALLOC_MIN_SIZE) : 16)
 
 /*
  * Whenever changing this, take care of that kmalloc_type() and
  * create_kmalloc_caches() still work as intended.
  *
  * KMALLOC_NORMAL can contain only unaccounted objects whereas KMALLOC_CGROUP
  * is for accounted but unreclaimable and non-dma objects. All the other
  * kmem caches can have both accounted and unaccounted objects.
  */
 enum kmalloc_cache_type {
     KMALLOC_NORMAL = 0,
 #ifndef CONFIG_ZONE_DMA
     KMALLOC_DMA = KMALLOC_NORMAL,
 #endif
 #ifndef CONFIG_MEMCG_KMEM
     KMALLOC_CGROUP = KMALLOC_NORMAL,
 #else
     KMALLOC_CGROUP,
 #endif
     KMALLOC_RECLAIM,
 #ifdef CONFIG_ZONE_DMA
     KMALLOC_DMA,
 #endif
     NR_KMALLOC_TYPES
 };
 
 #ifndef CONFIG_SLOB
 extern struct kmem_cache *
 kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1];
 
 /*
  * Define gfp bits that should not be set for KMALLOC_NORMAL.
  */
 #define KMALLOC_NOT_NORMAL_BITS                 \
     (__GFP_RECLAIMABLE |                    \
     (IS_ENABLED(CONFIG_ZONE_DMA)   ? __GFP_DMA : 0) |   \
     (IS_ENABLED(CONFIG_MEMCG_KMEM) ? __GFP_ACCOUNT : 0))
 
 static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags)
 {
     /*
      * The most common case is KMALLOC_NORMAL, so test for it
      * with a single branch for all the relevant flags.
      */
     if (likely((flags & KMALLOC_NOT_NORMAL_BITS) == 0))
         return KMALLOC_NORMAL;
 
     /*
      * At least one of the flags has to be set. Their priorities in
      * decreasing order are:
      *  1) __GFP_DMA
      *  2) __GFP_RECLAIMABLE
      *  3) __GFP_ACCOUNT
      */
     if (IS_ENABLED(CONFIG_ZONE_DMA) && (flags & __GFP_DMA))
         return KMALLOC_DMA;
     if (!IS_ENABLED(CONFIG_MEMCG_KMEM) || (flags & __GFP_RECLAIMABLE))
         return KMALLOC_RECLAIM;
     else
         return KMALLOC_CGROUP;
 }
 
 /*
  * Figure out which kmalloc slab an allocation of a certain size
  * belongs to.
  * 0 = zero alloc
  * 1 =  65 .. 96 bytes
  * 2 = 129 .. 192 bytes
  * n = 2^(n-1)+1 .. 2^n
  *
  * Note: __kmalloc_index() is compile-time optimized, and not runtime optimized;
  * typical usage is via kmalloc_index() and therefore evaluated at compile-time.
  * Callers where !size_is_constant should only be test modules, where runtime
  * overheads of __kmalloc_index() can be tolerated.  Also see kmalloc_slab().
  */
 static __always_inline unsigned int __kmalloc_index(size_t size,
                             bool size_is_constant)
 {
     if (!size)
         return 0;
 
     if (size <= KMALLOC_MIN_SIZE)
         return KMALLOC_SHIFT_LOW;
 
     if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
         return 1;
     if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
         return 2;
     if (size <=          8) return 3;
     if (size <=         16) return 4;
     if (size <=         32) return 5;
     if (size <=         64) return 6;
     if (size <=        128) return 7;
     if (size <=        256) return 8;
     if (size <=        512) return 9;
     if (size <=       1024) return 10;
     if (size <=   2 * 1024) return 11;
     if (size <=   4 * 1024) return 12;
     if (size <=   8 * 1024) return 13;
     if (size <=  16 * 1024) return 14;
     if (size <=  32 * 1024) return 15;
     if (size <=  64 * 1024) return 16;
     if (size <= 128 * 1024) return 17;
     if (size <= 256 * 1024) return 18;
     if (size <= 512 * 1024) return 19;
     if (size <= 1024 * 1024) return 20;
     if (size <=  2 * 1024 * 1024) return 21;
     if (size <=  4 * 1024 * 1024) return 22;
     if (size <=  8 * 1024 * 1024) return 23;
     if (size <=  16 * 1024 * 1024) return 24;
     if (size <=  32 * 1024 * 1024) return 25;
 
     if (!IS_ENABLED(CONFIG_PROFILE_ALL_BRANCHES) && size_is_constant)
         BUILD_BUG_ON_MSG(1, "unexpected size in kmalloc_index()");
     else
         BUG();
 
     /* Will never be reached. Needed because the compiler may complain */
     return -1;
 }
 #define kmalloc_index(s) __kmalloc_index(s, true)
 #endif /* !CONFIG_SLOB */
 
 void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __alloc_size(1);
 void *kmem_cache_alloc(struct kmem_cache *s, gfp_t flags) __assume_slab_alignment __malloc;
 void *kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
                gfp_t gfpflags) __assume_slab_alignment __malloc;
 void kmem_cache_free(struct kmem_cache *s, void *objp);
 
 /*
  * Bulk allocation and freeing operations. These are accelerated in an
  * allocator specific way to avoid taking locks repeatedly or building
  * metadata structures unnecessarily.
  *
  * Note that interrupts must be enabled when calling these functions.
  */
 void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p);
 int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, void **p);
 
 /*
  * Caller must not use kfree_bulk() on memory not originally allocated
  * by kmalloc(), because the SLOB allocator cannot handle this.
  */
 static __always_inline void kfree_bulk(size_t size, void **p)
 {
     kmem_cache_free_bulk(NULL, size, p);
 }
 
 #ifdef CONFIG_NUMA
 void *__kmalloc_node(size_t size, gfp_t flags, int node) __assume_kmalloc_alignment
                              __alloc_size(1);
 void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node) __assume_slab_alignment
                                      __malloc;
 #else
 static __always_inline __alloc_size(1) void *__kmalloc_node(size_t size, gfp_t flags, int node)
 {
     return __kmalloc(size, flags);
 }
 
 static __always_inline void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t flags, int node)
 {
     return kmem_cache_alloc(s, flags);
 }
 #endif
 
 #ifdef CONFIG_TRACING
 extern void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t flags, size_t size)
                    __assume_slab_alignment __alloc_size(3);
 
 #ifdef CONFIG_NUMA
 extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
                      int node, size_t size) __assume_slab_alignment
                                 __alloc_size(4);
 #else
 static __always_inline __alloc_size(4) void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
                          gfp_t gfpflags, int node, size_t size)
 {
     return kmem_cache_alloc_trace(s, gfpflags, size);
 }
 #endif /* CONFIG_NUMA */
 
 #else /* CONFIG_TRACING */
 static __always_inline __alloc_size(3) void *kmem_cache_alloc_trace(struct kmem_cache *s,
                                     gfp_t flags, size_t size)
 {
     void *ret = kmem_cache_alloc(s, flags);
 
     ret = kasan_kmalloc(s, ret, size, flags);
     return ret;
 }
 
 static __always_inline void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
                              int node, size_t size)
 {
     void *ret = kmem_cache_alloc_node(s, gfpflags, node);
 
     ret = kasan_kmalloc(s, ret, size, gfpflags);
     return ret;
 }
 #endif /* CONFIG_TRACING */
 
 extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) __assume_page_alignment
                                      __alloc_size(1);
 
 #ifdef CONFIG_TRACING
 extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
                 __assume_page_alignment __alloc_size(1);
 #else
 static __always_inline __alloc_size(1) void *kmalloc_order_trace(size_t size, gfp_t flags,
                                  unsigned int order)
 {
     return kmalloc_order(size, flags, order);
 }
 #endif
 
 static __always_inline __alloc_size(1) void *kmalloc_large(size_t size, gfp_t flags)
 {
     unsigned int order = get_order(size);
     return kmalloc_order_trace(size, flags, order);
 }
 
 /**
  * kmalloc - allocate memory
  * @size: how many bytes of memory are required.
  * @flags: the type of memory to allocate.
  *
  * kmalloc is the normal method of allocating memory
  * for objects smaller than page size in the kernel.
  *
  * The allocated object address is aligned to at least ARCH_KMALLOC_MINALIGN
  * bytes. For @size of power of two bytes, the alignment is also guaranteed
  * to be at least to the size.
  *
  * The @flags argument may be one of the GFP flags defined at
  * include/linux/gfp.h and described at
  * :ref:`Documentation/core-api/mm-api.rst <mm-api-gfp-flags>`
  *
  * The recommended usage of the @flags is described at
  * :ref:`Documentation/core-api/memory-allocation.rst <memory_allocation>`
  *
  * Below is a brief outline of the most useful GFP flags
  *
  * %GFP_KERNEL
  *  Allocate normal kernel ram. May sleep.
  *
  * %GFP_NOWAIT
  *  Allocation will not sleep.
  *
  * %GFP_ATOMIC
  *  Allocation will not sleep.  May use emergency pools.
  *
  * %GFP_HIGHUSER
  *  Allocate memory from high memory on behalf of user.
  *
  * Also it is possible to set different flags by OR'ing
  * in one or more of the following additional @flags:
  *
  * %__GFP_HIGH
  *  This allocation has high priority and may use emergency pools.
  *
  * %__GFP_NOFAIL
  *  Indicate that this allocation is in no way allowed to fail
  *  (think twice before using).
  *
  * %__GFP_NORETRY
  *  If memory is not immediately available,
  *  then give up at once.
  *
  * %__GFP_NOWARN
  *  If allocation fails, don't issue any warnings.
  *
  * %__GFP_RETRY_MAYFAIL
  *  Try really hard to succeed the allocation but fail
  *  eventually.
  */
 static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
 {
     if (__builtin_constant_p(size)) {
 #ifndef CONFIG_SLOB
         unsigned int index;
 #endif
         if (size > KMALLOC_MAX_CACHE_SIZE)
             return kmalloc_large(size, flags);
 #ifndef CONFIG_SLOB
         index = kmalloc_index(size);
 
         if (!index)
             return ZERO_SIZE_PTR;
 
         return kmem_cache_alloc_trace(
                 kmalloc_caches[kmalloc_type(flags)][index],
                 flags, size);
 #endif
     }
     return __kmalloc(size, flags);
 }
 
 static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
 {
 #ifndef CONFIG_SLOB
     if (__builtin_constant_p(size) &&
         size <= KMALLOC_MAX_CACHE_SIZE) {
         unsigned int i = kmalloc_index(size);
 
         if (!i)
             return ZERO_SIZE_PTR;
 
         return kmem_cache_alloc_node_trace(
                 kmalloc_caches[kmalloc_type(flags)][i],
                         flags, node, size);
     }
 #endif
     return __kmalloc_node(size, flags, node);
 }
 
 /**
  * kmalloc_array - allocate memory for an array.
  * @n: number of elements.
  * @size: element size.
  * @flags: the type of memory to allocate (see kmalloc).
  */
 static inline __alloc_size(1, 2) void *kmalloc_array(size_t n, size_t size, gfp_t flags)
 {
     size_t bytes;
 
     if (unlikely(check_mul_overflow(n, size, &bytes)))
         return NULL;
     if (__builtin_constant_p(n) && __builtin_constant_p(size))
         return kmalloc(bytes, flags);
     return __kmalloc(bytes, flags);
 }
 
 /**
  * krealloc_array - reallocate memory for an array.
  * @p: pointer to the memory chunk to reallocate
  * @new_n: new number of elements to alloc
  * @new_size: new size of a single member of the array
  * @flags: the type of memory to allocate (see kmalloc)
  */
 static inline __alloc_size(2, 3) void * __must_check krealloc_array(void *p,
                                     size_t new_n,
                                     size_t new_size,
                                     gfp_t flags)
 {
     size_t bytes;
 
     if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
         return NULL;
 
     return krealloc(p, bytes, flags);
 }
 
 /**
  * kcalloc - allocate memory for an array. The memory is set to zero.
  * @n: number of elements.
  * @size: element size.
  * @flags: the type of memory to allocate (see kmalloc).
  */
 static inline __alloc_size(1, 2) void *kcalloc(size_t n, size_t size, gfp_t flags)
 {
     return kmalloc_array(n, size, flags | __GFP_ZERO);
 }
 
 /*
  * kmalloc_track_caller is a special version of kmalloc that records the
  * calling function of the routine calling it for slab leak tracking instead
  * of just the calling function (confusing, eh?).
  * It's useful when the call to kmalloc comes from a widely-used standard
  * allocator where we care about the real place the memory allocation
  * request comes from.
  */
 extern void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller);
 #define kmalloc_track_caller(size, flags) \
     __kmalloc_track_caller(size, flags, _RET_IP_)
 
 static inline __alloc_size(1, 2) void *kmalloc_array_node(size_t n, size_t size, gfp_t flags,
                               int node)
 {
     size_t bytes;
 
     if (unlikely(check_mul_overflow(n, size, &bytes)))
         return NULL;
     if (__builtin_constant_p(n) && __builtin_constant_p(size))
         return kmalloc_node(bytes, flags, node);
     return __kmalloc_node(bytes, flags, node);
 }
 
 static inline __alloc_size(1, 2) void *kcalloc_node(size_t n, size_t size, gfp_t flags, int node)
 {
     return kmalloc_array_node(n, size, flags | __GFP_ZERO, node);
 }
 
 
 #ifdef CONFIG_NUMA
 extern void *__kmalloc_node_track_caller(size_t size, gfp_t flags, int node,
                      unsigned long caller) __alloc_size(1);
 #define kmalloc_node_track_caller(size, flags, node) \
     __kmalloc_node_track_caller(size, flags, node, \
             _RET_IP_)
 
 #else /* CONFIG_NUMA */
 
 #define kmalloc_node_track_caller(size, flags, node) \
     kmalloc_track_caller(size, flags)
 
 #endif /* CONFIG_NUMA */
 
 /*
  * Shortcuts
  */
 static inline void *kmem_cache_zalloc(struct kmem_cache *k, gfp_t flags)
 {
     return kmem_cache_alloc(k, flags | __GFP_ZERO);
 }
 
 /**
  * kzalloc - allocate memory. The memory is set to zero.
  * @size: how many bytes of memory are required.
  * @flags: the type of memory to allocate (see kmalloc).
  */
 static inline __alloc_size(1) void *kzalloc(size_t size, gfp_t flags)
 {
     return kmalloc(size, flags | __GFP_ZERO);
 }
 
 /**
  * kzalloc_node - allocate zeroed memory from a particular memory node.
  * @size: how many bytes of memory are required.
  * @flags: the type of memory to allocate (see kmalloc).
  * @node: memory node from which to allocate
  */
 static inline __alloc_size(1) void *kzalloc_node(size_t size, gfp_t flags, int node)
 {
     return kmalloc_node(size, flags | __GFP_ZERO, node);
 }
 
 extern void *kvmalloc_node(size_t size, gfp_t flags, int node) __alloc_size(1);
 static inline __alloc_size(1) void *kvmalloc(size_t size, gfp_t flags)
 {
     return kvmalloc_node(size, flags, NUMA_NO_NODE);
 }
 static inline __alloc_size(1) void *kvzalloc_node(size_t size, gfp_t flags, int node)
 {
     return kvmalloc_node(size, flags | __GFP_ZERO, node);
 }
 static inline __alloc_size(1) void *kvzalloc(size_t size, gfp_t flags)
 {
     return kvmalloc(size, flags | __GFP_ZERO);
 }
 
 static inline __alloc_size(1, 2) void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
 {
     size_t bytes;
 
     if (unlikely(check_mul_overflow(n, size, &bytes)))
         return NULL;
 
     return kvmalloc(bytes, flags);
 }
 
 static inline __alloc_size(1, 2) void *kvcalloc(size_t n, size_t size, gfp_t flags)
 {
     return kvmalloc_array(n, size, flags | __GFP_ZERO);
 }
 
 extern void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags)
               __alloc_size(3);
 extern void kvfree(const void *addr);
 extern void kvfree_sensitive(const void *addr, size_t len);
 
 unsigned int kmem_cache_size(struct kmem_cache *s);
 void __init kmem_cache_init_late(void);
 
 #if defined(CONFIG_SMP) && defined(CONFIG_SLAB)
 int slab_prepare_cpu(unsigned int cpu);
 int slab_dead_cpu(unsigned int cpu);
 #else
 #define slab_prepare_cpu    NULL
 #define slab_dead_cpu       NULL
 #endif
 
 #endif  /* _LINUX_SLAB_H */

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