From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755906AbdDMART (ORCPT ); Wed, 12 Apr 2017 20:17:19 -0400 Received: from LGEAMRELO13.lge.com ([156.147.23.53]:52355 "EHLO lgeamrelo13.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755587AbdDMARP (ORCPT ); Wed, 12 Apr 2017 20:17:15 -0400 X-Original-SENDERIP: 156.147.1.126 X-Original-MAILFROM: minchan@kernel.org X-Original-SENDERIP: 165.244.249.23 X-Original-MAILFROM: minchan@kernel.org X-Original-SENDERIP: 10.177.223.161 X-Original-MAILFROM: minchan@kernel.org From: Minchan Kim To: Andrew Morton CC: , Sergey Senozhatsky , , Minchan Kim , , Subject: [PATCH 3/3] zsmalloc: expand class bit Date: Thu, 13 Apr 2017 09:17:02 +0900 Message-ID: <1492042622-12074-3-git-send-email-minchan@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1492042622-12074-1-git-send-email-minchan@kernel.org> References: <1492042622-12074-1-git-send-email-minchan@kernel.org> X-MIMETrack: Itemize by SMTP Server on LGEKRMHUB06/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2017/04/13 09:17:12, Serialize by Router on LGEKRMHUB06/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2017/04/13 09:17:12, Serialize complete at 2017/04/13 09:17:12 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now 64K page system, zsamlloc has 257 classes so 8 class bit is not enough. With that, it corrupts the system when zsmalloc stores 65536byte data(ie, index number 256) so that this patch increases class bit for simple fix for stable backport. We should clean up this mess soon. index size 0 32 1 288 .. .. 204 52256 256 65536 Cc: linux-mm@kvack.org Fixes: 3783689a1 ("zsmalloc: introduce zspage structure") Cc: stable@vger.kernel.org Signed-off-by: Minchan Kim --- mm/zsmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index b7b1fb6c8c21..9feadf4fc3d5 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -275,7 +275,7 @@ struct zs_pool { struct zspage { struct { unsigned int fullness:FULLNESS_BITS; - unsigned int class:CLASS_BITS; + unsigned int class:CLASS_BITS + 1; unsigned int isolated:ISOLATED_BITS; unsigned int magic:MAGIC_VAL_BITS; }; -- 2.7.4