linux-kernel - Re: [PATCH] cmpxchg: Discard unnecessary cast to volatile

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Message-ID: <54468063.4070408@zytor.com>
Date:	Tue, 21 Oct 2014 08:48:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Pranith Kumar <bobby.prani@...il.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	Borislav Petkov <bp@...e.de>,
	"open list:X86 ARCHITECTURE..." <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cmpxchg: Discard unnecessary cast to volatile

On 10/21/2014 03:14 AM, Peter Zijlstra wrote:
> On Mon, Oct 20, 2014 at 04:22:27PM -0400, Pranith Kumar wrote:
>>> Generating a volatile pointer is really not necessary here. This is the only
>>> location where a volatile pointer is being generated for use in asm.
>>>
>>> This commit removes the unnecessary volatile pointer being created.
>>>
>>> Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
> 
> Seems sane enough to me.
> 

However, it seems like unnecessary churn.  Does the volatile hurt in any
way?

	-hpa

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