linux-kernel - Re: [PATCH 0/8] mm/swap: fix some rare issues in swap subsystem

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Date:	Mon, 27 Jan 2014 05:19:50 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Weijie Yang <weijie.yang@...sung.com>
Cc:	hughd@...gle.com, 'Andrew Morton' <akpm@...ux-foundation.org>,
	'Minchan Kim' <minchan@...nel.org>, shli@...nel.org,
	'Bob Liu' <bob.liu@...cle.com>, weijie.yang.kh@...il.com,
	'Seth Jennings' <sjennings@...iantweb.net>,
	'Linux-MM' <linux-mm@...ck.org>,
	'linux-kernel' <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org, 'Heesub Shin' <heesub.shin@...sung.com>,
	mguzik@...hat.com
Subject: Re: [PATCH 0/8] mm/swap: fix some rare issues in swap subsystem

On Mon, Jan 27, 2014 at 06:00:03PM +0800, Weijie Yang wrote:
> This patch series focus on some tiny and rare issues in swap subsystem.
> These issues happen rarely, so it is just for the correctness of the code.
> 
> It firstly add some comments to try to make swap flag/lock usage in
> swapfile.c more clear and readable,
> and fix some rare issues in swap subsystem that cause race condition among
> swapon, swapoff and frontswap_register_ops.
> and fix some not race issues.
> 
> Please see individual patch for details, any complaint and suggestion
> are welcome.
> 
> Regards
> 
> patch 1/8: add some comments for swap flag/lock usage
> 
> patch 2/8: fix race on swap_info reuse between swapoff and swapon
> 	This patch has been in akpm -mm tree, however I improve it according
> 	to Heesub Shin and Mateusz Guzik's suggestion. So, that old patch need
> 	to be dropped.
> 
> patch 3/8: prevent concurrent swapon on the same S_ISBLK blockdev
> 
> patch 4/8: fix race among frontswap_register_ops, swapoff and swapon
> 
> patch 5/8: drop useless and bug frontswap_shrink codes
> 
> patch 6/8: remove swap_lock to simplify si_swapinfo()
> 
> patch 7/8: check swapfile blocksize greater than PAGE_SIZE
> 
> patch 8/8: add missing handle on a dup-store failure
> 
>  include/linux/blkdev.h    |    4 +++-
>  include/linux/frontswap.h |    2 --
>  include/linux/swapfile.h  |    4 +---
>  mm/frontswap.c            |  127 +++++++------------------------------------------------------------------------------------------------------------------------
>  mm/page_io.c              |    2 ++
>  mm/rmap.c                 |    2 +-
>  mm/swapfile.c             |  138 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------
>  7 files changed, 112 insertions(+), 167 deletions(-)


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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