linux-kernel - Re: [RFC PATCH] x86: Use volatile semantics for atomic

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Date:	Mon, 22 Sep 2014 22:08:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] x86: Use volatile semantics for atomic_set()

On Mon, Sep 22, 2014 at 03:39:21PM -0400, Pranith Kumar wrote:
> All the atomic operations have volatile semantics to prevent compiler
> reordering. Enforce the same semantics for atomic_set() too.

To what point? atomic_set() is typically not what you expect it to
anyhow.
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