[PATCH] slab: fix kzalloc and kstrdup caller report for CONFIG_DEBUG_SLAB

Fix kzalloc() and kstrdup() caller report for CONFIG_DEBUG_SLAB.  We must
pass the caller to __cache_alloc() instead of directly doing
__builtin_return_address(0) there; otherwise kzalloc() and kstrdup() are
reported as the allocation site instead of the real one.

Thanks to Valdis Kletnieks for reporting the problem and Steven Rostedt for
the original idea.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 1fb77a9cc148..8cf52939d0ab 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -76,7 +76,14 @@ struct cache_sizes {
         kmem_cache_t    *cs_dmacachep;
 };
 extern struct cache_sizes malloc_sizes[];
+
+#ifndef CONFIG_DEBUG_SLAB
 extern void *__kmalloc(size_t, gfp_t);
+#else
+extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
+#define __kmalloc(size, flags) \
+    __kmalloc_track_caller(size, flags, __builtin_return_address(0))
+#endif
 
 static inline void *kmalloc(size_t size, gfp_t flags)
 {