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

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Message-ID: <4F9B020B.9050205@linux.intel.com>
Date:	Fri, 27 Apr 2012 13:31:07 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Steven Rostedt <rostedt@...dmis.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 01:27 PM, Sam Ravnborg wrote:
>>
>> My question is, how do I remove the dependency in kconfig based on the
>> compiler?
> 
> Allow the user to select one of:
> 1) function tracer
> 2) frame pointer
> 3) none of the above
> 
> This should be trivial to do in Kconfig language.
> 
> If "function tracer" is selected then use -mfentry if supported,
> with a fallback to frame pointers.
> 
> This looks simple IMO and should be easy to implement too.
> 

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.

	-hpa


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