linux-kernel - Re: [PATCH][GIT PULL][v2.6.32] tracing/x86: Add check to detect GCC messing with mcount prologue

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Message-ID: <4B06F2BC.1050900@zytor.com>
Date:	Fri, 20 Nov 2009 11:49:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	rostedt@...dmis.org
CC:	Andrew Haley <aph@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	feng.tang@...el.com, Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Daney <ddaney@...iumnetworks.com>,
	Richard Guenther <richard.guenther@...il.com>,
	jakub@...hat.com, gcc <gcc@....gnu.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH][GIT PULL][v2.6.32] tracing/x86: Add check to detect 
 GCC messing with mcount prologue

On 11/20/2009 11:46 AM, Steven Rostedt wrote:
> 
> Yes a gcc test suite will help new instances of gcc. But we need to
> worry about the instances of gcc that people have on their desktops now.
> This test case will catch the discrepancy between gcc and the function
> graph tracer. I'm not 100% convince that just adding -mtune=generic will
> help in all cases. If we miss another instance, then the function graph
> tracer may crash someone's kernel.
> 

Furthermore, for future gcc instances what we really want is the early
interception support anyway.

	-hpa
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