[Devel] [PATCH rh7 19/39] mm/kasan, slub: don't disable interrupts when object leaves quarantine

[Andrey Ryabinin]

SLUB doesn't require disabled interrupts to call ___cache_free().

Link: http://lkml.kernel.org/r/1470062715-14077-3-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
Acked-by: Alexander Potapenko <glider at google.com>
Cc: Dmitry Vyukov <dvyukov at google.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

https://jira.sw.ru/browse/PSBM-69081
(cherry picked from commit f7376aed6c032aab820fa36806a89e16e353a0d9)
Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
---
 mm/kasan/quarantine.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index 65793f150d1f..4852625ff851 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -147,10 +147,14 @@ static void qlink_free(struct qlist_node *qlink, struct kmem_cache *cache)
 	struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
 	unsigned long flags;
 
-	local_irq_save(flags);
+	if (IS_ENABLED(CONFIG_SLAB))
+		local_irq_save(flags);
+
 	alloc_info->state = KASAN_STATE_FREE;
 	___cache_free(cache, object, _THIS_IP_);
-	local_irq_restore(flags);
+
+	if (IS_ENABLED(CONFIG_SLAB))
+		local_irq_restore(flags);
 }
 
 static void qlist_free_all(struct qlist_head *q, struct kmem_cache *cache)
-- 
2.13.5