From: Qiaowei Ren <qiaowei.ren@intel.com>
Date: Sat, 14 Dec 2013 06:25:02 +0000 (+0800)
Subject: x86: add user_atomic_cmpxchg_inatomic at uaccess.h
X-Git-Tag: v3.14-rc1~155^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f09174c501f8bb259788cc36d5a7aa5b2831fb5e;p=pandora-kernel.git

x86: add user_atomic_cmpxchg_inatomic at uaccess.h

This patch adds user_atomic_cmpxchg_inatomic() to use CMPXCHG
instruction against a user space address.

This generalizes the already existing futex_atomic_cmpxchg_inatomic()
so it can be used in other contexts.  This will be used in the
upcoming support for Intel MPX (Memory Protection Extensions.)

[ hpa: replaced #ifdef inside a macro with IS_ENABLED() ]

Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>
Link: http://lkml.kernel.org/r/1387002303-6620-1-git-send-email-qiaowei.ren@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
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