From: Roman Bobniev <roman.bobn...@sonymobile.com>
Move more kmemleak calls into hook functions, and make it so
that all hooks (both inside and outside of #ifdef CONFIG_SLUB_DEBUG_ON)
call the appropriate kmemleak routines. This allows for
kmemleak to be configured independently of slub debug features.
It also fixes a bug where kmemleak was only partially enabled
in some configurations.
Signed-off-by: Roman Bobniev <roman.bobn...@sonymobile.com>
Signed-off-by: Tim Bird <tim.b...@sonymobile.com>
---
mm/slub.c | 40 ++++++++++++++++++++++++++++++++++++----
1 file changed, 36 insertions(+), 4 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index c3eb3d3..95e170e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -933,6 +933,11 @@ static void trace(struct kmem_cache *s, struct page *page,
void *object,
* Hooks for other subsystems that check memory allocations. In a typical
* production configuration these hooks all should produce no code at all.
*/
+static inline post_alloc_hook(void *ptr, size_t size, gfp_t flags)
+{
+ kmemleak_alloc(ptr, size, 1, flags);
+}
+
static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags)
{
flags &= gfp_allowed_mask;
@@ -973,6 +978,11 @@ static inline void slab_free_hook(struct kmem_cache *s,
void *x)
debug_check_no_obj_freed(x, s->object_size);
}
+static inline void free_hook(void *x)
+{
+ kmemleak_free(x);
+}
+
/*
* Tracking of fully allocated slabs for debugging purposes.
*
@@ -1260,13 +1270,35 @@ static inline void inc_slabs_node(struct kmem_cache *s,
int node,
static inline void dec_slabs_node(struct kmem_cache *s, int node,
int objects) {}
+/*
+ * Define the hook functions as empty of most debug code.
+ * However, leave the kmemleak calls so they can be configured
+ * independently of CONFIG_SLUB_DEBUG_ON.
+ */
+static inline post_alloc_hook(void *ptr, size_t size, gfp_t flags)
+{
+ kmemleak_alloc(ptr, size, 1, flags);
+}
+
static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags)
{ return 0; }
static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
- void *object) {}
+ void *object)
+{
+ kmemleak_alloc_recursive(object, s->object_size, 1, s->flags,
+ flags & gfp_allowed_mask);
+}
-static inline void slab_free_hook(struct kmem_cache *s, void *x) {}
+static inline void slab_free_hook(struct kmem_cache *s, void *x)
+{
+ kmemleak_free_recursive(x, s->flags);
+}
+
+static inline void free_hook(void *x)
+{
+ kmemleak_free(x);
+}
#endif /* CONFIG_SLUB_DEBUG */
@@ -3272,7 +3304,7 @@ static void *kmalloc_large_node(size_t size, gfp_t flags,
int node)
if (page)
ptr = page_address(page);
- kmemleak_alloc(ptr, size, 1, flags);
+ post_alloc_hook(ptr, size, flags);
return ptr;
}
@@ -3336,7 +3368,7 @@ void kfree(const void *x)
page = virt_to_head_page(x);
if (unlikely(!PageSlab(page))) {
BUG_ON(!PageCompound(page));
- kmemleak_free(x);
+ free_hook(x);
__free_memcg_kmem_pages(page, compound_order(page));
return;
}
--
1.8.2.2
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