linux-kernel - Re: [PATCH] [4/16] HWPOISON: Add support for poison swap entries v2

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Date:	Thu, 28 May 2009 12:42:14 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
Cc:	Andi Kleen <andi@...stfloor.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	fengguang.wu@...el.com,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>,
	Taketoshi Sakuraba <taketoshi.sakuraba.hc@...achi.com>
Subject: Re: [PATCH] [4/16] HWPOISON: Add support for poison swap entries v2

On Thu, May 28, 2009 at 05:46:56PM +0900, Hidehiro Kawai wrote:
> > + */
> > +#ifdef CONFIG_MEMORY_FAILURE
> > +#define SWP_HWPOISON_NUM 1
> > +#define SWP_HWPOISON		(MAX_SWAPFILES + 1)
> > +#else
> > +#define SWP_HWPOISON_NUM 0
> > +#endif
> > +
> > +#define MAX_SWAPFILES \
> > +	((1 << MAX_SWAPFILES_SHIFT) - SWP_MIGRATION_NUM - SWP_HWPOISON_NUM - 1)
> 
> I don't prefer this fix against the overflow issue.
> For example, if both CONFIG_MIGRATION and CONFIG_MEMORY_FAILURE are
> undefined, MAX_SWAPFILES is defined as 31.  But we should be able to
> use up to 32 swap files/devices!

Ok. Applied thanks. 

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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