From: Christoph Lameter <cl@linux.com>
Date: Mon, 6 Dec 2010 17:40:03 +0000 (-0600)
Subject: highmem: Use this_cpu_xx_return() operations
X-Git-Tag: v2.6.38-rc1~455^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cfb824349556904b319464139be5c75fce983b0d;p=pandora-kernel.git

highmem: Use this_cpu_xx_return() operations

Use this_cpu operations to optimize access primitives for highmem.

The main effect is the avoidance of address calculations through the
use of a segment prefix.

V3->V4
	- kmap_atomic_idx: Do not return a value.
	- Use __this_cpu_dec without HIGHMEM_DEBUG

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

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