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-rw-r--r--include/linux/slab.h126
-rw-r--r--include/linux/slab_def.h4
-rw-r--r--include/linux/slob_def.h46
-rw-r--r--include/linux/slub_def.h6
4 files changed, 117 insertions, 65 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index cd6ab65..27402fe 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -42,7 +42,6 @@ struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
void (*)(void *, struct kmem_cache *, unsigned long));
void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);
-void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
void kmem_cache_free(struct kmem_cache *, void *);
unsigned int kmem_cache_size(struct kmem_cache *);
@@ -61,16 +60,6 @@ int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr);
sizeof(struct __struct), __alignof__(struct __struct),\
(__flags), NULL, NULL)
-#ifdef CONFIG_NUMA
-extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
-#else
-static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
- gfp_t flags, int node)
-{
- return kmem_cache_alloc(cachep, flags);
-}
-#endif
-
/*
* The largest kmalloc size supported by the slab allocators is
* 32 megabyte (2^25) or the maximum allocatable page order if that is
@@ -89,7 +78,6 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
/*
* Common kmalloc functions provided by all allocators
*/
-void *__kmalloc(size_t, gfp_t);
void *__kzalloc(size_t, gfp_t);
void * __must_check krealloc(const void *, size_t, gfp_t);
void kfree(const void *);
@@ -100,40 +88,6 @@ size_t ksize(const void *);
* @n: number of elements.
* @size: element size.
* @flags: the type of memory to allocate.
- */
-static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
-{
- if (n != 0 && size > ULONG_MAX / n)
- return NULL;
- return __kzalloc(n * size, flags);
-}
-
-/*
- * Allocator specific definitions. These are mainly used to establish optimized
- * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by selecting
- * the appropriate general cache at compile time.
- */
-
-#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
-#ifdef CONFIG_SLUB
-#include <linux/slub_def.h>
-#else
-#include <linux/slab_def.h>
-#endif /* !CONFIG_SLUB */
-#else
-
-/*
- * Fallback definitions for an allocator not wanting to provide
- * its own optimized kmalloc definitions (like SLOB).
- */
-
-/**
- * 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
- * in the kernel.
*
* The @flags argument may be one of:
*
@@ -141,7 +95,7 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
*
* %GFP_KERNEL - Allocate normal kernel ram. May sleep.
*
- * %GFP_ATOMIC - Allocation will not sleep.
+ * %GFP_ATOMIC - Allocation will not sleep. May use emergency pools.
* For example, use this inside interrupt handlers.
*
* %GFP_HIGHUSER - Allocate pages from high memory.
@@ -150,18 +104,22 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
*
* %GFP_NOFS - Do not make any fs calls while trying to get memory.
*
+ * %GFP_NOWAIT - Allocation will not sleep.
+ *
+ * %GFP_THISNODE - Allocate node-local memory only.
+ *
+ * %GFP_DMA - Allocation suitable for DMA.
+ * Should only be used for kmalloc() caches. Otherwise, use a
+ * slab created with SLAB_DMA.
+ *
* Also it is possible to set different flags by OR'ing
* in one or more of the following additional @flags:
*
* %__GFP_COLD - Request cache-cold pages instead of
* trying to return cache-warm pages.
*
- * %__GFP_DMA - Request memory from the DMA-capable zone.
- *
* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
*
- * %__GFP_HIGHMEM - Allocated memory may be from highmem.
- *
* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
* (think twice before using).
*
@@ -171,24 +129,57 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
* %__GFP_NOWARN - If allocation fails, don't issue any warnings.
*
* %__GFP_REPEAT - If allocation fails initially, try once more before failing.
+ *
+ * There are other flags available as well, but these are not intended
+ * for general use, and so are not documented here. For a full list of
+ * potential flags, always refer to linux/gfp.h.
*/
-static inline void *kmalloc(size_t size, gfp_t flags)
+static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
- return __kmalloc(size, flags);
+ if (n != 0 && size > ULONG_MAX / n)
+ return NULL;
+ return __kzalloc(n * size, flags);
}
-/**
- * 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).
+/*
+ * Allocator specific definitions. These are mainly used to establish optimized
+ * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by
+ * selecting the appropriate general cache at compile time.
+ *
+ * Allocators must define at least:
+ *
+ * kmem_cache_alloc()
+ * __kmalloc()
+ * kmalloc()
+ * kzalloc()
+ *
+ * Those wishing to support NUMA must also define:
+ *
+ * kmem_cache_alloc_node()
+ * kmalloc_node()
+ *
+ * See each allocator definition file for additional comments and
+ * implementation notes.
*/
-static inline void *kzalloc(size_t size, gfp_t flags)
-{
- return __kzalloc(size, flags);
-}
+#ifdef CONFIG_SLUB
+#include <linux/slub_def.h>
+#elif defined(CONFIG_SLOB)
+#include <linux/slob_def.h>
+#else
+#include <linux/slab_def.h>
#endif
-#ifndef CONFIG_NUMA
+#if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
+/**
+ * kmalloc_node - allocate memory from a specific node
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate (see kcalloc).
+ * @node: node to allocate from.
+ *
+ * kmalloc() for non-local nodes, used to allocate from a specific node
+ * if available. Equivalent to kmalloc() in the non-NUMA single-node
+ * case.
+ */
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
return kmalloc(size, flags);
@@ -198,7 +189,15 @@ static inline void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
return __kmalloc(size, flags);
}
-#endif /* !CONFIG_NUMA */
+
+void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
+
+static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
+ gfp_t flags, int node)
+{
+ return kmem_cache_alloc(cachep, flags);
+}
+#endif /* !CONFIG_NUMA && !CONFIG_SLOB */
/*
* kmalloc_track_caller is a special version of kmalloc that records the
@@ -245,4 +244,3 @@ extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
#endif /* __KERNEL__ */
#endif /* _LINUX_SLAB_H */
-
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 8d81a60..365d036 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -25,6 +25,9 @@ struct cache_sizes {
};
extern struct cache_sizes malloc_sizes[];
+void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
+void *__kmalloc(size_t size, gfp_t flags);
+
static inline void *kmalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size)) {
@@ -79,6 +82,7 @@ found:
#ifdef CONFIG_NUMA
extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
+extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
diff --git a/include/linux/slob_def.h b/include/linux/slob_def.h
new file mode 100644
index 0000000..a2daf2d
--- /dev/null
+++ b/include/linux/slob_def.h
@@ -0,0 +1,46 @@
+#ifndef __LINUX_SLOB_DEF_H
+#define __LINUX_SLOB_DEF_H
+
+void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
+
+static inline void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
+{
+ return kmem_cache_alloc_node(cachep, flags, -1);
+}
+
+void *__kmalloc_node(size_t size, gfp_t flags, int node);
+
+static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
+{
+ return __kmalloc_node(size, flags, node);
+}
+
+/**
+ * kmalloc - allocate memory
+ * @size: how many bytes of memory are required.
+ * @flags: the type of memory to allocate (see kcalloc).
+ *
+ * kmalloc is the normal method of allocating memory
+ * in the kernel.
+ */
+static inline void *kmalloc(size_t size, gfp_t flags)
+{
+ return __kmalloc_node(size, flags, -1);
+}
+
+static inline void *__kmalloc(size_t size, gfp_t flags)
+{
+ return kmalloc(size, flags);
+}
+
+/**
+ * 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 kcalloc).
+ */
+static inline void *kzalloc(size_t size, gfp_t flags)
+{
+ return __kzalloc(size, flags);
+}
+
+#endif /* __LINUX_SLOB_DEF_H */
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 6207a3d..a582f67 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -171,6 +171,9 @@ static inline struct kmem_cache *kmalloc_slab(size_t size)
#define ZERO_SIZE_PTR ((void *)16)
+void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
+void *__kmalloc(size_t size, gfp_t flags);
+
static inline void *kmalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
@@ -198,7 +201,8 @@ static inline void *kzalloc(size_t size, gfp_t flags)
}
#ifdef CONFIG_NUMA
-extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
+void *__kmalloc_node(size_t size, gfp_t flags, int node);
+void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
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