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-rw-r--r--include/linux/slab.h13
-rw-r--r--include/linux/slab_def.h12
-rw-r--r--include/linux/slub_def.h12
3 files changed, 25 insertions, 12 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 27402fea9b7..0289ec89300 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -31,6 +31,19 @@
#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
/*
+ * 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)
+
+/*
* struct kmem_cache related prototypes
*/
void __init kmem_cache_init(void);
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 365d036c454..16e814ffab8 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -32,6 +32,10 @@ static inline void *kmalloc(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; \
@@ -58,6 +62,10 @@ 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; \
@@ -88,6 +96,10 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
if (__builtin_constant_p(size)) {
int i = 0;
+
+ if (!size)
+ return ZERO_SIZE_PTR;
+
#define CACHE(x) \
if (size <= x) \
goto found; \
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a582f677152..579b0a22858 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -159,18 +159,6 @@ static inline struct kmem_cache *kmalloc_slab(size_t size)
#define SLUB_DMA 0
#endif
-
-/*
- * 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)
-
-
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *__kmalloc(size_t size, gfp_t flags);