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Date:	Sat, 12 Mar 2016 16:49:41 +0800
From:	Ming Lei <>
To:	Kent Overstreet <>
Cc:	Ming Lin <>, Jens Axboe <>,
	Linux Kernel Mailing List <>
Subject: Re: e827091cb1 "block: merge: get the 1st and last bvec via helpers" broken

On Sat, Mar 12, 2016 at 3:43 PM, Kent Overstreet
<> wrote:
> I don't know exactly how it's broken, but with that patch segment counting is
> broken - I'm seeing blk_rq_map_sg() overrun the end of the sgtable.
> I suggest reverting it for 4.5...

Kent, could you share your test case? I'd like to figure out the root cause.

BTW, I don't object to revert it given it is close to v4.5 release, but I am
curious how it breaks segment couting.

Ming Lei

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