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Date: Sun, 22 Nov 2009 01:38:09 -0800
Message-ID: <6dc9ffc80911220138y15bfa91agccf5c29f1c30e09a@mail.gmail.com>
Subject: Re: [PATCH][GIT PULL][v2.6.32] tracing/x86: Add check to detect GCC 
	messing with mcount prologue
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Andrew Haley <aph@redhat.com>
Cc: rostedt@goodmis.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Heiko Carstens <heiko.carstens@de.ibm.com>, feng.tang@intel.com,
       Peter Zijlstra <peterz@infradead.org>,
       Frederic Weisbecker <fweisbec@gmail.com>,
       David Daney <ddaney@caviumnetworks.com>,
       Richard Guenther <richard.guenther@gmail.com>, jakub@redhat.com,
       gcc <gcc@gcc.gnu.org>, Linus Torvalds <torvalds@linux-foundation.org>
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On Fri, Nov 20, 2009 at 11:35 AM, Andrew Haley <aph@redhat.com> wrote:
> Steven Rostedt wrote:
>> Ingo, Thomas and Linus,
>>
>> I know Thomas did a patch to force the -mtune=generic, but just in case
>> gcc decides to do something crazy again, this patch will catch it.
>>
>> Should we try to get this in now?
>
> I'm sure this makes sense, but a gcc test case would be even better.
> If this can be detected in the gcc test suite it'll be found and
> fixed long before y'all in kernel land get to see it. ?That's the
> only way to guarantee this never bothers you again.
>
> H.J., who wrote the code in question, is hopefully looking at why
> this odd code is being generated. ?Once he's done I can put a
> suitable test case in the gcc test suite.
>

See:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109#c7


-- 
H.J.
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