evie/android_kernel_oneplus_msm8998
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SLAB: Record actual last user of freed objects.

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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>
This commit is contained in:
Suleiman Souhlal 2011-06-02 00:16:42 -07:00 • committed by Pekka Enberg
parent d4d84fef6d
commit a947eb95ea
1 changed files with 5 additions and 4 deletions
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9
mm/slab.c
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@ -3604,13 +3604,14 @@ free_done:
* Release an obj back to its cache. If the obj has a constructed state, it must * 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. * 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); struct array_cache *ac = cpu_cache_get(cachep);
check_irq_off(); check_irq_off();
kmemleak_free_recursive(objp, cachep->flags); 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)); kmemcheck_slab_free(cachep, objp, obj_size(cachep));
@ -3801,7 +3802,7 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
debug_check_no_locks_freed(objp, obj_size(cachep)); debug_check_no_locks_freed(objp, obj_size(cachep));
if (!(cachep->flags & SLAB_DEBUG_OBJECTS)) if (!(cachep->flags & SLAB_DEBUG_OBJECTS))
debug_check_no_obj_freed(objp, obj_size(cachep)); 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); local_irq_restore(flags);
trace_kmem_cache_free(_RET_IP_, objp); trace_kmem_cache_free(_RET_IP_, objp);
@ -3831,7 +3832,7 @@ void kfree(const void *objp)
c = virt_to_cache(objp); c = virt_to_cache(objp);
debug_check_no_locks_freed(objp, obj_size(c)); debug_check_no_locks_freed(objp, obj_size(c));
debug_check_no_obj_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); local_irq_restore(flags);
} }
EXPORT_SYMBOL(kfree); EXPORT_SYMBOL(kfree);