linux-kernel - e827091cb1 "block: merge: get the 1st and last bvec via helpers" broken

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Date:	Fri, 11 Mar 2016 22:43:29 -0900
From:	Kent Overstreet <kent.overstreet@...il.com>
To:	mlin@...nel.org, axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org
Subject: e827091cb1 "block: merge: get the 1st and last bvec via helpers"
 broken

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...