--- linux-2.6.16.9/include/linux/slab.h	2006-04-19 08:10:14.000000000 +0200
+++ linux-2.6.16.9-kfree/include/linux/slab.h	2006-04-27 11:19:00.000000000 +0200
@@ -123,7 +123,18 @@
 	return kzalloc(n * size, flags);
 }
 
-extern void kfree(const void *);
+extern void __kfree(const void *);
+
+static inline void kfree(const void *ptr)
+{
+	if (__builtin_constant_p(ptr==NULL)) {
+		if (ptr)
+			__kfree(ptr);
+	} else {
+		__kfree(ptr);
+	}
+}
+
 extern unsigned int ksize(const void *);
 
 #ifdef CONFIG_NUMA
--- linux-2.6.16.9/mm/slab.c	2006-04-27 11:24:38.000000000 +0200
+++ linux-2.6.16.9-kfree/mm/slab.c	2006-04-27 11:17:06.000000000 +0200
@@ -3267,7 +3267,7 @@
 EXPORT_SYMBOL(kmem_cache_free);
 
 /**
- * kfree - free previously allocated memory
+ * __kfree - free previously allocated memory
  * @objp: pointer returned by kmalloc.
  *
  * If @objp is NULL, no operation is performed.
@@ -3275,7 +3275,7 @@
  * Don't free memory not originally allocated by kmalloc()
  * or you will run into trouble.
  */
-void kfree(const void *objp)
+void __kfree(const void *objp)
 {
 	struct kmem_cache *c;
 	unsigned long flags;