From: Tejun Heo <tj@kernel.org>
Date: Thu, 13 Jun 2013 03:52:01 +0000 (-0700)
Subject: percpu-refcount: add __must_check to percpu_ref_init() and don't use ACCESS_ONCE... 
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~46^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=acac7883ee7bcc32476963bce7baf73d44574dd1;p=pandora-kernel.git

percpu-refcount: add __must_check to percpu_ref_init() and don't use ACCESS_ONCE() in percpu_ref_kill_rcu()

Two small changes.

* Unlike most init functions, percpu_ref_init() allocates memory and
  may fail.  Let's mark it with __must_check in case the caller
  forgets.

* percpu_ref_kill_rcu() is unnecessarily using ACCESS_ONCE() to
  dereference @ref->pcpu_count, which can be misleading.  The pointer
  is guaranteed to be valid and visible and can't change underneath
  the function.  Drop ACCESS_ONCE().

Signed-off-by: Tejun Heo <tj@kernel.org>
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