slub: Disable interrupts in free_debug processing

We will be calling free_debug_processing with interrupts disabled
in some case when the later patches are applied. Some of the
functions called by free_debug_processing expect interrupts to be
off.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/mm/slub.c b/mm/slub.c
index ee70c09..08c57a0 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1040,6 +1040,10 @@ bad:
 static noinline int free_debug_processing(struct kmem_cache *s,
                 struct page *page, void *object, unsigned long addr)
 {
+       unsigned long flags;
+       int rc = 0;
+
+       local_irq_save(flags);
        slab_lock(page);
 
        if (!check_slab(s, page))
@@ -1056,7 +1060,7 @@ static noinline int free_debug_processing(struct kmem_cache *s,
        }
 
        if (!check_object(s, page, object, SLUB_RED_ACTIVE))
-               return 0;
+               goto out;
 
        if (unlikely(s != page->slab)) {
                if (!PageSlab(page)) {
@@ -1077,13 +1081,15 @@ static noinline int free_debug_processing(struct kmem_cache *s,
                set_track(s, object, TRACK_FREE, addr);
        trace(s, page, object, 0);
        init_object(s, object, SLUB_RED_INACTIVE);
+       rc = 1;
+out:
        slab_unlock(page);
-       return 1;
+       local_irq_restore(flags);
+       return rc;
 
 fail:
        slab_fix(s, "Object at 0x%p not freed", object);
-       slab_unlock(page);
-       return 0;
+       goto out;
 }
 
 static int __init setup_slub_debug(char *str)