From: Vivek Goyal <vgoyal@redhat.com>
Date: Thu, 19 May 2011 19:38:29 +0000 (-0400)
Subject: blk-cgroup: Make 64bit per cpu stats safe on 32bit arch
X-Git-Tag: v3.0-rc1~163^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=575969a0dd3fe65c6556bcb8f87c42303326ea55;p=pandora-kernel.git

blk-cgroup: Make 64bit per cpu stats safe on 32bit arch

Some of the stats are 64bit and updation will be non atomic on 32bit
architecture. Use sequence counters on 32bit arch to make reading
of stats safe.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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