From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-return-158206-listarch-gcc=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 14661 invoked by alias); 22 Nov 2009 09:39:16 -0000
Received: (qmail 14652 invoked by uid 22791); 22 Nov 2009 09:39:15 -0000
X-SWARE-Spam-Status: No, hits=-1.8 required=5.0 	tests=AWL,BAYES_00,SARE_MSGID_LONG40,SPF_PASS
X-Spam-Check-By: sourceware.org
Received: from mail-ew0-f227.google.com (HELO mail-ew0-f227.google.com) (209.85.219.227)     by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 22 Nov 2009 09:38:12 +0000
Received: by ewy27 with SMTP id 27so911943ewy.16         for <gcc@gcc.gnu.org>; Sun, 22 Nov 2009 01:38:09 -0800 (PST)
MIME-Version: 1.0
Received: by 10.216.88.75 with SMTP id z53mr1072220wee.46.1258882689639; Sun,  	22 Nov 2009 01:38:09 -0800 (PST)
In-Reply-To: <4B06EF6F.2050507@redhat.com>
References: <alpine.LFD.2.00.0911181933540.24119@localhost.localdomain> 	 <tip-887a29f59b93cf54e21814869a4ab6e80b6fa623@git.kernel.org> 	 <20091119072040.GA23579@elte.hu> 	 <alpine.LFD.2.00.0911191053390.24119@localhost.localdomain> 	 <alpine.LFD.2.00.0911191423190.24119@localhost.localdomain> 	 <1258694593.22249.1012.camel@gandalf.stny.rr.com> 	 <1258736456.22249.1032.camel@gandalf.stny.rr.com> 	 <4B06EF6F.2050507@redhat.com>
Date: Sun, 22 Nov 2009 09:39:00 -0000
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>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-IsSubscribed: yes
Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc/>
List-Post: <mailto:gcc@gcc.gnu.org>
List-Help: <http://gcc.gnu.org/ml/>
Sender: gcc-owner@gcc.gnu.org
X-SW-Source: 2009-11/txt/msg00606.txt.bz2

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=3Dgeneric, 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. =A0That'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. =A0Once 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=3D42109#c7


--=20
H.J.