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@xxxxxxxxx>
> :
> : 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
>
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