linux-kernel - RE: [PATCH 1/2] x86: add user_atomic_cmpxchg

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Date:	Mon, 16 Dec 2013 12:21:27 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] x86: add user_atomic_cmpxchg_inatomic at uaccess.h

Qiaowei Ren wrote: 
> 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.)
> 
Peter, do you have any other comments for this version?

Thanks,
Qiaowei
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