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From: David Daney <ddaney@caviumnetworks.com>
To: Jason Baron <jbaron@redhat.com>, rth@redhat.com
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	rostedt@goodmis.org, mingo@elte.hu, mathieu.desnoyers@polymtl.ca,
	tglx@linutronix.de, andi@firstfloor.org, roland@redhat.com,
	masami.hiramatsu.pt@hitachi.com, fweisbec@gmail.com,
	avi@redhat.com, davem@davemloft.net, vgoyal@redhat.com,
	sam@ravnborg.org, tony@bakeyournoodle.com, dsd@laptop.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] jump label: disable due to compiler bug
Date: Thu, 28 Oct 2010 11:55:32 -0700	[thread overview]
Message-ID: <4CC9C724.3020004@caviumnetworks.com> (raw)
In-Reply-To: <20101028141757.GA2875@redhat.com>

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

  reply	other threads:[~2010-10-28 18:55 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-27 21:07 [PATCH 0/2] jump label updates Jason Baron
2010-10-27 21:07 ` [PATCH 1/2] move arch_init_ideal_nop5 later Jason Baron
2010-10-27 22:24   ` H. Peter Anvin
2010-10-28  2:11     ` Steven Rostedt
2010-10-28  2:59       ` H. Peter Anvin
2010-10-27 21:07 ` [PATCH 2/2] jump label: disable due to compiler bug Jason Baron
2010-10-27 22:21   ` H. Peter Anvin
2010-10-28 14:17     ` Jason Baron, rth
2010-10-28 18:55       ` David Daney [this message]
2010-10-28 20:11         ` Jason Baron
2010-10-29  6:34           ` Ingo Molnar
2010-10-29 12:18             ` Steven Rostedt
2010-10-29 12:22               ` Ingo Molnar
2010-10-29 12:46                 ` Steven Rostedt
2010-10-29 13:10                   ` Ingo Molnar
2010-10-29 13:35                   ` Mathieu Desnoyers
2010-10-29 16:18                     ` Steven Rostedt
2010-10-29 17:18                       ` David Daney
2010-10-29 17:33                         ` Steven Rostedt
2010-10-29 17:48                           ` David Daney
2010-10-29 18:03                             ` Steven Rostedt
2010-10-29 18:13                             ` Richard Henderson
2010-10-29 18:25                               ` Steven Rostedt
2010-10-29 20:15                           ` H. Peter Anvin
2010-10-29 20:42                             ` Mathieu Desnoyers
2010-10-29 20:47                             ` Steven Rostedt
2010-10-29 20:51                               ` H. Peter Anvin
2010-10-29 20:58                                 ` Steven Rostedt
2010-10-30  7:47                               ` Andi Kleen
2010-10-30 14:00                                 ` Steven Rostedt
2010-10-29 20:05                       ` Mathieu Desnoyers
2010-10-29 20:44                         ` Steven Rostedt
2010-10-29 15:59           ` Richard Henderson
2010-10-27 21:15 ` [PATCH 0/2] jump label updates David Miller
2010-10-28  1:33   ` Steven Rostedt

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