Re: [RFC][PATCH 2/4] ftrace: Add -mfentry to Makefile on functiontracer

[H. Peter Anvin]

On 02/09/2011 12:28 PM, Steven Rostedt wrote:
> On Wed, 2011-02-09 at 15:02 -0500, Steven Rostedt wrote:
> 
>>  ifdef CONFIG_FUNCTION_TRACER
>> -KBUILD_CFLAGS	+= -pg
>> +ifdef CONFIG_HAVE_FENTRY
>> +CC_HAS_FENTRY	:= $(call cc-option, -mfentry -DCC_HAS_FENTRY)
> 
> I should include a thanks to H. Peter Anvin in the change log for
> telling me about the cc-option trick.
> 

Actually we should probably calling this -DCC_USING_FENTRY or something
like that, since as coded above it includes the CONFIG_FUNCTION_TRACER
dependency.  This is a good thing -- it makes the conditionals easier --
we just also want to make sure they don't get misunderstood.

	-hpa
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