linux-kernel - Re: [PATCH v2 1/1] block: blk-merge: don't merge the pages with non-contiguous descriptors

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Message-ID: <20130117110438.GZ23505@n2100.arm.linux.org.uk>
Date:	Thu, 17 Jan 2013 11:04:38 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Subhash Jadavani <subhashj@...eaurora.org>,
	Tejun Heo <tj@...nel.org>, asias@...hat.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/1] block: blk-merge: don't merge the pages with
	non-contiguous descriptors

On Thu, Jan 17, 2013 at 11:01:47AM +0000, James Bottomley wrote:
> On Thu, 2013-01-17 at 10:47 +0000, Russell King - ARM Linux wrote:
> > Also, couldn't the addition of the scatterlist offset to the page also
> > be buggy too?
> 
> No, fortunately, offset must be within the first page from the point of
> view of block generated sg lists.  As long as nothing within arm
> violates this, it should be a safe assumption ... although the code
> seems to assume otherwise.

Are you absolutely sure about that?  I believe I have seen cases where
that has been violated in the past, though it was many years ago.
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