linux-kernel - Re: [PATCH, -v3] compiler/gcc4: Add quirk for 'asm goto' miscompilation bug

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Message-ID: <20131011054655.GA28077@gmail.com>
Date:	Fri, 11 Oct 2013 07:46:55 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Fengguang Wu <fengguang.wu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jakub Jelinek <jakub@...hat.com>,
	Richard Henderson <rth@...ddle.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, -v3] compiler/gcc4: Add quirk for 'asm goto'
 miscompilation bug


* Fengguang Wu <fengguang.wu@...el.com> wrote:

> > Indeed. Something like the updated version below?
> > 
> > [ I kept the asm_volatile_goto() naming to make sure the implicit volatile 
> >   is visible. ]
> 
> Ingo, I applied this patch (as commit c015a7f0b746) on top of 
> tip/sched/core
> 
>         3354781a2184 "sched/numa: Reflow task_numa_group() to avoid a compiler warning"
> 
> The below results show that it does fixed the many oops:

Thanks Fengguang!

I've added your Tested-by tag as well and have split the patch in two 
parts: the upstream part with a -stable tag and the rmwcc.h part that goes 
into the scheduler tree.

If there are no objections I will send a pull request for the upstream 
part to Linus later today.

Thanks,

	Ingo
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