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

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Date:	Mon, 25 Jan 2016 22:01:20 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	stable@...r.kernel.org, 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.work@...il.com>
Subject: Re: [stable] upstream 3d5fe03a3ea01 -stable backport request

On (01/25/16 21:46), Sergey Senozhatsky wrote:
> 
> Hello,
> 
> Please add upstream 'commit 3d5fe03a3ea01 ("zram/zcomp: use
> GFP_NOIO to allocate streams")' to stable releases.
> 

[v3.15+]

	-ss

> 
> :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
>