From: Ming Lei <tom.leiming@gmail.com>
Date: Thu, 16 Jul 2015 03:16:45 +0000 (+0800)
Subject: block: partition: convert percpu ref
X-Git-Tag: omap-for-v4.3/fixes-rc1~113^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c71013ecb7e2bddbed9f5b95e7aed22c491daa9;p=pandora-kernel.git

block: partition: convert percpu ref

Percpu refcount is the perfect match for partition's case,
and the conversion is quite straight.

With the convertion, one pair of atomic inc/dec can be saved
for accounting block I/O, which is run in hot path of block I/O.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
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