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Subject: Re: [RFC][PATCH 2/4] ftrace: Add -mfentry to Makefile on function
 tracer
From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Andi Kleen <andi@firstfloor.org>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Michal Marek <mmarek@suse.cz>
In-Reply-To: <20110209201029.772571775@goodmis.org>
References: <20110209200249.111932716@goodmis.org>
	 <20110209201029.772571775@goodmis.org>
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Date: Wed, 09 Feb 2011 15:28:52 -0500
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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.

-- Steve

> +endif
> +KBUILD_CFLAGS	+= -pg $(CC_HAS_FENTRY)
> +KBUILD_AFLAGS	+= $(CC_HAS_FENTRY)
>  ifdef CONFIG_DYNAMIC_FTRACE
>  	ifdef CONFIG_HAVE_C_RECORDMCOUNT
>  		BUILD_C_RECORDMCOUNT := y