linux-kernel - Re: [PATCH 2/2] jump label: disable due to compiler bug

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Message-ID: <4CC9C724.3020004@caviumnetworks.com>
Date:	Thu, 28 Oct 2010 11:55:32 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Jason Baron <jbaron@...hat.com>, rth@...hat.com
CC:	"H. Peter Anvin" <hpa@...or.com>, rostedt@...dmis.org,
	mingo@...e.hu, mathieu.desnoyers@...ymtl.ca, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, davem@...emloft.net, vgoyal@...hat.com,
	sam@...nborg.org, tony@...eyournoodle.com, dsd@...top.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] jump label: disable due to compiler bug

On 10/28/2010 07:17 AM, Jason Baron wrote:
> On Wed, Oct 27, 2010 at 03:21:55PM -0700, H. Peter Anvin wrote:
>> Could you detail the bug, please?  static_cpu_has() also uses asm goto.
>>
>
> It seems that gcc can leave the stack in an inconsistent state.
>
> I only saw this in the 'jmp' enabled case, I'm not sure if it can occur in the
> straight-line code path as well.
>

Jason,

Were you going to file a GCC bug on this issue?  Someone should.

It would be a shame to have the problem persist due to lack of awareness 
by the GCC developers.

David Daney
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