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

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Message-ID: <1288385260.29632.24.camel@gandalf.stny.rr.com>
Date:	Fri, 29 Oct 2010 16:47:40 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	David Daney <ddaney@...iumnetworks.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>, Jason Baron <jbaron@...hat.com>,
	rth@...hat.com, 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 Fri, 2010-10-29 at 13:15 -0700, H. Peter Anvin wrote:

> I disagree with that assessment.
> 
> We know that if version >= 4.5.2 the problem has been fixed, and that
> for earlier versions we can't know if it's there, so just disable it for
> gcc < 4.5.2.  The fix might have been backported, but it's not a big
> deal if the users of backported compilers don't see the full benefit --
> it's only a problem during a limited time window anyway.
> 
> Admittedly it would be nice to have a header file or even a
> configuration file where the gcc version is tested and workarounds are
> centralized; then the backporters could put their own overrides in there.

Fine, but we can wait till 2.6.38 for that. For now we have a manual
config option. I'm not changing it until I have 4.5.2 in my distcc farm
and testing it out.

If things turn out fine, we can have > 4.5.2 || run check option. Or
just stick with 4.5.2. But we can debate this later (or at KS if you
want ;-)

-- Steve


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