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

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Message-ID: <1288373582.29632.3.camel@gandalf.stny.rr.com>
Date:	Fri, 29 Oct 2010 13:33:02 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ingo Molnar <mingo@...e.hu>, Jason Baron <jbaron@...hat.com>,
	rth@...hat.com, "H. Peter Anvin" <hpa@...or.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 10:18 -0700, David Daney wrote:

> I hate to continue beating a dead horse, but RTH just committed the GCC 
> patch, and it will be part of GCC-4.5.2 and later.

Great!

> 
> Should this knowledge be builtin to the jump label enabling calculus?

No, because we can't trust versions. We never know what home grown gcc a
kernel developer is using (and what has been backported or not). Thus
the only option is to have a builtin test we can do at compile time to
determine if the bug exists or not and decide then.

Note, I'm currently running my last set of patches through ktest. When
it finishes (presumably with no issues), I'll post a pull request.

-- Steve


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