SLAB: Record actual last user of freed objects.
Currently, when using CONFIG_DEBUG_SLAB, we put in kfree() or
kmem_cache_free() as the last user of free objects, which is not
very useful, so change it to the caller of those functions instead.
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Suleiman Souhlal <suleiman@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/mm/slab.c b/mm/slab.c
index bcfa498..d96e223 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3604,13 +3604,14 @@
* Release an obj back to its cache. If the obj has a constructed state, it must
* be in this state _before_ it is released. Called with disabled ints.
*/
-static inline void __cache_free(struct kmem_cache *cachep, void *objp)
+static inline void __cache_free(struct kmem_cache *cachep, void *objp,
+ void *caller)
{
struct array_cache *ac = cpu_cache_get(cachep);
check_irq_off();
kmemleak_free_recursive(objp, cachep->flags);
- objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
+ objp = cache_free_debugcheck(cachep, objp, caller);
kmemcheck_slab_free(cachep, objp, obj_size(cachep));
@@ -3801,7 +3802,7 @@
debug_check_no_locks_freed(objp, obj_size(cachep));
if (!(cachep->flags & SLAB_DEBUG_OBJECTS))
debug_check_no_obj_freed(objp, obj_size(cachep));
- __cache_free(cachep, objp);
+ __cache_free(cachep, objp, __builtin_return_address(0));
local_irq_restore(flags);
trace_kmem_cache_free(_RET_IP_, objp);
@@ -3831,7 +3832,7 @@
c = virt_to_cache(objp);
debug_check_no_locks_freed(objp, obj_size(c));
debug_check_no_obj_freed(objp, obj_size(c));
- __cache_free(c, (void *)objp);
+ __cache_free(c, (void *)objp, __builtin_return_address(0));
local_irq_restore(flags);
}
EXPORT_SYMBOL(kfree);