linux-kernel - [PATCH] zsmalloc: calling zs_map

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Message-Id: <20170920063941.14662-1-sergey.senozhatsky@gmail.com>
Date:   Wed, 20 Sep 2017 15:39:41 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: [PATCH] zsmalloc: calling zs_map_object() from irq is a bug

Use BUG_ON(in_interrupt()) in zs_map_object(). Calling this
function from IRQ is a bug, because we use per-CPU mappings
and interrupt may corrupt those buffers.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 mm/zsmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 7c38e850a8fc..685049a9048d 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1349,7 +1349,7 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
 	 * pools/users, we can't allow mapping in interrupt context
 	 * because it can corrupt another users mappings.
 	 */
-	WARN_ON_ONCE(in_interrupt());
+	BUG_ON(in_interrupt());
 
 	/* From now on, migration cannot move the object */
 	pin_tag(handle);
-- 
2.14.1