Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef _LINUX_SLAB_DEF_H
2#define _LINUX_SLAB_DEF_H
3
4/*
5 * Definitions unique to the original Linux SLAB allocator.
6 *
7 * What we provide here is a way to optimize the frequent kmalloc
8 * calls in the kernel by selecting the appropriate general cache
9 * if kmalloc was called with a size that can be established at
10 * compile time.
11 */
12
13#include <linux/init.h>
14#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
15#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
16#include <linux/compiler.h>
17
18/* Size description struct for general caches. */
19struct cache_sizes {
20 size_t cs_size;
21 struct kmem_cache *cs_cachep;
22#ifdef CONFIG_ZONE_DMA
23 struct kmem_cache *cs_dmacachep;
24#endif
25};
26extern struct cache_sizes malloc_sizes[];
27
28void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
29void *__kmalloc(size_t size, gfp_t flags);
30
31static inline void *kmalloc(size_t size, gfp_t flags)
32{
33 if (__builtin_constant_p(size)) {
34 int i = 0;
35
36 if (!size)
37 return ZERO_SIZE_PTR;
38
39#define CACHE(x) \
40 if (size <= x) \
41 goto found; \
42 else \
43 i++;
44#include <linux/kmalloc_sizes.h>
45#undef CACHE
46 return NULL;
47found:
48#ifdef CONFIG_ZONE_DMA
49 if (flags & GFP_DMA)
50 return kmem_cache_alloc(malloc_sizes[i].cs_dmacachep,
51 flags);
52#endif
53 return kmem_cache_alloc(malloc_sizes[i].cs_cachep, flags);
54 }
55 return __kmalloc(size, flags);
56}
57
58#ifdef CONFIG_NUMA
59extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
60extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
61
62static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
63{
64 if (__builtin_constant_p(size)) {
65 int i = 0;
66
67 if (!size)
68 return ZERO_SIZE_PTR;
69
70#define CACHE(x) \
71 if (size <= x) \
72 goto found; \
73 else \
74 i++;
75#include <linux/kmalloc_sizes.h>
76#undef CACHE
77 return NULL;
78found:
79#ifdef CONFIG_ZONE_DMA
80 if (flags & GFP_DMA)
81 return kmem_cache_alloc_node(malloc_sizes[i].cs_dmacachep,
82 flags, node);
83#endif
84 return kmem_cache_alloc_node(malloc_sizes[i].cs_cachep,
85 flags, node);
86 }
87 return __kmalloc_node(size, flags, node);
88}
89
90#endif /* CONFIG_NUMA */
91
92#endif /* _LINUX_SLAB_DEF_H */