linux-kernel - Re: RFC: How to handle function tracing, frame pointers and -mfentry?

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Date:	Fri, 27 Apr 2012 14:11:55 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Sam Ravnborg <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: RFC: How to handle function tracing, frame pointers and -mfentry?

On 04/27/2012 01:57 PM, Steven Rostedt wrote:
>>
>> Except it is the wrong thing.  This is not the only user of frame
>> pointer.  What I think you mean is remove the dependency in Kconfig, but
>> force the frame pointer enabled if -mfentry is not supported.
> 
> You mean option 3?
> 
> 3) Add frame pointers silently if gcc fails to build with gcc -pg.
> 

Yes, your option 3.

	-hypa

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