From: Tejun Heo <tj@kernel.org>
Date: Sat, 28 Jun 2014 12:10:12 +0000 (-0400)
Subject: percpu-refcount: one bit is enough for REF_STATUS
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~191^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d630dc4c9adb41e5bd1e06df2dbeaf622469ddd5;p=pandora-kernel.git

percpu-refcount: one bit is enough for REF_STATUS

percpu-refcount currently reserves two lowest bits of its percpu
pointer to indicate its state; however, only one bit is used for
PCPU_REF_DEAD.

Simplify it by removing PCPU_STATUS_BITS/MASK and testing
PCPU_REF_DEAD directly.  This also allows the compiler to choose a
more efficient instruction depending on the architecture.

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

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