From: Tejun Heo <tj@kernel.org>
Date: Tue, 6 Jan 2015 15:26:10 +0000 (-0500)
Subject: percpu_ref: implement percpu_ref_is_dying()
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~152^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c907baf36d8339f393bb576d0bab29194d0e6ad;p=pandora-kernel.git

percpu_ref: implement percpu_ref_is_dying()

Implement percpu_ref_is_dying() which tests whether the ref is dying
or dead.  This is useful to determine the current state when a
percpu_ref is used as a cyclic on/off switch via kill and reinit.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
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