kmemleak: Add the slob memory allocation/freeing hooks

This patch adds the callbacks to kmemleak_(alloc|free) functions from the
slob allocator.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NMatt Mackall <mpm@selenic.com>
Acked-by: NPekka Enberg <penberg@cs.helsinki.fi>

mm/slob.c

@@ -67,6 +67,7 @@
 #include <linux/rcupdate.h>
 #include <linux/list.h>
 #include <linux/kmemtrace.h>
+#include <linux/kmemleak.h>
 #include <asm/atomic.h>
 
 /*
@@ -509,6 +510,7 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
 				   size, PAGE_SIZE << order, gfp, node);
 	}
 
+	kmemleak_alloc(ret, size, 1, gfp);
 	return ret;
 }
 EXPORT_SYMBOL(__kmalloc_node);
@@ -521,6 +523,7 @@ void kfree(const void *block)
 
 	if (unlikely(ZERO_OR_NULL_PTR(block)))
 		return;
+	kmemleak_free(block);
 
 	sp = slob_page(block);
 	if (is_slob_page(sp)) {
@@ -584,12 +587,14 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
 	} else if (flags & SLAB_PANIC)
 		panic("Cannot create slab cache %s\n", name);
 
+	kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
 	return c;
 }
 EXPORT_SYMBOL(kmem_cache_create);
 
 void kmem_cache_destroy(struct kmem_cache *c)
 {
+	kmemleak_free(c);
 	slob_free(c, sizeof(struct kmem_cache));
 }
 EXPORT_SYMBOL(kmem_cache_destroy);
@@ -613,6 +618,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
 	if (c->ctor)
 		c->ctor(b);
 
+	kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags);
 	return b;
 }
 EXPORT_SYMBOL(kmem_cache_alloc_node);
@@ -635,6 +641,7 @@ static void kmem_rcu_free(struct rcu_head *head)
 
 void kmem_cache_free(struct kmem_cache *c, void *b)
 {
+	kmemleak_free_recursive(b, c->flags);
 	if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
 		struct slob_rcu *slob_rcu;
 		slob_rcu = b + (c->size - sizeof(struct slob_rcu));