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>

1 files changed, 10 insertions, 4 deletions

diff --git a/mm/slub.c b/mm/slub.c
index ee70c091e577..08c57a047548 100644
--- 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)