slab: clean up leak tracking ifdefs a little bit]

Index: linux-2.6/include/linux/slab.h
===================================================================
@@ -78,13 +78,6 @@
 extern struct cache_sizes malloc_sizes[];
 
 extern void *__kmalloc(size_t, gfp_t);
-#ifndef CONFIG_DEBUG_SLAB
-#define ____kmalloc(size, flags) __kmalloc(size, flags)
-#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
 
 /**
  * kmalloc - allocate memory

@@ -154,6 +147,23 @@
 	return __kmalloc(size, flags);
 }
 
+/*
+ * kmalloc_track_caller is a special version of kmalloc that records the
+ * calling function of the routine calling it for slab leak tracking instead
+ * of just the calling function (confusing, eh?).
+ * It's useful when the call to kmalloc comes from a widely-used standard
+ * allocator where we care about the real place the memory allocation
+ * request comes from.
+ */
+#ifndef CONFIG_DEBUG_SLAB
+#define kmalloc_track_caller(size, flags) \
+	__kmalloc(size, flags)
+#else
+extern void *__kmalloc_track_caller(size_t, gfp_t, void*);
+#define kmalloc_track_caller(size, flags) \
+	__kmalloc_track_caller(size, flags, __builtin_return_address(0))
+#endif
+
 extern void *__kzalloc(size_t, gfp_t);
 
 /**

@@ -250,7 +260,7 @@
 #define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
 #define kmalloc_node(s, f, n) kmalloc(s, f)
 #define kzalloc(s, f) __kzalloc(s, f)
-#define ____kmalloc kmalloc
+#define kmalloc_track_caller kmalloc
 
 #endif /* CONFIG_SLOB */
 

Index: linux-2.6/mm/slab.c
===================================================================
@@ -3352,22 +3352,25 @@
 }
 
 
+#ifndef CONFIG_DEBUG_SLAB
 void *__kmalloc(size_t size, gfp_t flags)
 {
-#ifndef CONFIG_DEBUG_SLAB
-	return __do_kmalloc(size, flags, NULL);
-#else
 	return __do_kmalloc(size, flags, __builtin_return_address(0));
-#endif
 }
 EXPORT_SYMBOL(__kmalloc);
 
-#ifdef CONFIG_DEBUG_SLAB
 void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller)
 {
 	return __do_kmalloc(size, flags, caller);
 }
 EXPORT_SYMBOL(__kmalloc_track_caller);
+
+#else
+void *__kmalloc(size_t size, gfp_t flags)
+{
+	return __do_kmalloc(size, flags, NULL);
+}
+EXPORT_SYMBOL(__kmalloc);
 #endif
 
 #ifdef CONFIG_SMP

Index: linux-2.6/mm/util.c
===================================================================
@@ -11,7 +11,7 @@
  */
 void *__kzalloc(size_t size, gfp_t flags)
 {
-	void *ret = ____kmalloc(size, flags);
+	void *ret = kmalloc_track_caller(size, flags);
 	if (ret)
 		memset(ret, 0, size);
 	return ret;

@@ -33,7 +33,7 @@
 		return NULL;
 
 	len = strlen(s) + 1;
-	buf = ____kmalloc(len, gfp);
+	buf = kmalloc_track_caller(len, gfp);
 	if (buf)
 		memcpy(buf, s, len);
 	return buf;

Index: linux-2.6/net/core/skbuff.c
===================================================================
@@ -163,7 +163,8 @@
 
 	/* Get the DATA. Size must match skb_add_mtu(). */
 	size = SKB_DATA_ALIGN(size);
-	data = ____kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
+	data = kmalloc_track_caller(size + sizeof(struct skb_shared_info),
+			gfp_mask);
 	if (!data)
 		goto nodata;