linux-kernel - [stable] upstream 3d5fe03a3ea01 -stable backport request

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Message-ID: <20160125124654.GA526@swordfish>
Date:	Mon, 25 Jan 2016 21:46:54 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	stable@...r.kernel.org
Cc:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kyeongdon Kim <kyeongdon.kim@....com>,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: [stable] upstream 3d5fe03a3ea01 -stable backport request

Hello,

Please add upstream 'commit 3d5fe03a3ea01 ("zram/zcomp: use
GFP_NOIO to allocate streams")' to stable releases.

:commit 3d5fe03a3ea013060ebba2a811aeb0f23f56aefa
:Author: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
:
:    zram/zcomp: use GFP_NOIO to allocate streams
:    
:    We can end up allocating a new compression stream with GFP_KERNEL from
:    within the IO path, which may result is nested (recursive) IO
:    operations.  That can introduce problems if the IO path in question is a
:    reclaimer, holding some locks that will deadlock nested IOs.
:    
:    Allocate streams and working memory using GFP_NOIO flag, forbidding
:    recursive IO and FS operations.

	-ss