Slab allocators: Cleanup zeroing allocations

It becomes now easy to support the zeroing allocs with generic inline
functions in slab.h.  Provide inline definitions to allow the continued use of
kzalloc, kmem_cache_zalloc etc but remove other definitions of zeroing
functions from the slab allocators and util.c.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 46 insertions, 74 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 0289ec89300a..0e1d0daef6a2 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -55,7 +55,6 @@ 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_zalloc(struct kmem_cache *, gfp_t);
 void kmem_cache_free(struct kmem_cache *, void *);
 unsigned int kmem_cache_size(struct kmem_cache *);
 const char *kmem_cache_name(struct kmem_cache *);
@@ -91,11 +90,37 @@ int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr);
 /*
  * Common kmalloc functions provided by all allocators
  */
-void *__kzalloc(size_t, gfp_t);
 void * __must_check krealloc(const void *, size_t, gfp_t);
 void kfree(const void *);
 size_t ksize(const void *);
 
+/*
+ * 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()
+ *
+ * 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.
+ */
+#ifdef CONFIG_SLUB
+#include <linux/slub_def.h>
+#elif defined(CONFIG_SLOB)
+#include <linux/slob_def.h>
+#else
+#include <linux/slab_def.h>
+#endif
+
 /**
  * kcalloc - allocate memory for an array. The memory is set to zero.
  * @n: number of elements.
@@ -151,37 +176,9 @@ 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);
+        return __kmalloc(n * size, flags | __GFP_ZERO);
 }
 
-/*
- * 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.
- */
-#ifdef CONFIG_SLUB
-#include <linux/slub_def.h>
-#elif defined(CONFIG_SLOB)
-#include <linux/slob_def.h>
-#else
-#include <linux/slab_def.h>
-#endif
-
 #if !defined(CONFIG_NUMA) && !defined(CONFIG_SLOB)
 /**
  * kmalloc_node - allocate memory from a specific node
@@ -255,5 +252,23 @@ extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
 
 #endif /* DEBUG_SLAB */
 
+/*
+ * 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 void *kzalloc(size_t size, gfp_t flags)
+{
+        return kmalloc(size, flags | __GFP_ZERO);
+}
+
 #endif  /* __KERNEL__ */
 #endif  /* _LINUX_SLAB_H */
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 16e814ffab8d..32bdc2ffd715 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -58,36 +58,6 @@ found:
         return __kmalloc(size, flags);
 }
 
-static inline void *kzalloc(size_t size, gfp_t flags)
-{
-        if (__builtin_constant_p(size)) {
-                int i = 0;
-
-                if (!size)
-                        return ZERO_SIZE_PTR;
-
-#define CACHE(x) \
-                if (size <= x) \
-                        goto found; \
-                else \
-                        i++;
-#include "kmalloc_sizes.h"
-#undef CACHE
-                {
-                        extern void __you_cannot_kzalloc_that_much(void);
-                        __you_cannot_kzalloc_that_much();
-                }
-found:
-#ifdef CONFIG_ZONE_DMA
-                if (flags & GFP_DMA)
-                        return kmem_cache_zalloc(malloc_sizes[i].cs_dmacachep,
-                                                flags);
-#endif
-                return kmem_cache_zalloc(malloc_sizes[i].cs_cachep, flags);
-        }
-        return __kzalloc(size, flags);
-}
-
 #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);
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index bae11111458f..07f7e4cbcee3 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -179,19 +179,6 @@ static inline void *kmalloc(size_t size, gfp_t flags)
                 return __kmalloc(size, flags);
 }
 
-static inline void *kzalloc(size_t size, gfp_t flags)
-{
-        if (__builtin_constant_p(size) && !(flags & SLUB_DMA)) {
-                struct kmem_cache *s = kmalloc_slab(size);
-
-                if (!s)
-                        return ZERO_SIZE_PTR;
-
-                return kmem_cache_zalloc(s, flags);
-        } else
-                return __kzalloc(size, flags);
-}
-
 #ifdef CONFIG_NUMA
 void *__kmalloc_node(size_t size, gfp_t flags, int node);
 void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);