linux-kernel - Re: [RFC PATCH 3/4] ftrace: Do not test frame pointers if -mfentry is used

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Message-ID: <CA+55aFyVb5FE1t5zj7WJR3c=3PnCjwNd=UgC5eFdn5eV5PsEZw@mail.gmail.com>
Date:	Thu, 9 Aug 2012 06:45:37 +0300
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>, Michal Marek <mmarek@...e.cz>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC PATCH 3/4] ftrace: Do not test frame pointers if -mfentry is used

On Wed, Aug 8, 2012 at 3:49 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> No, CONFIG_HAVE_FENTRY just means fentry is supported, it does not mean
> that it is being used. It only gets used if CC_USING_FENTRY is set,
> which is set by the Makefile at time of compile.

Btw, it might be lovely to consider the concept of "Kconfig variables
set by shell-scripts".

We currently have a metric sh*t-ton of Makefile magic for testing
various things like this, and integrating it into Kconfig might be a
good idea. That way you would be able to use the Kconfig logic on
these things.

Kconfig already has the "option env=XYZ" syntax for importing values
from the environment variables. Extending it to some kind of "option
shell=xyz" would allow for more complex interactions like this
(imagine testing compiler options and version dependencies in the
Kconfig files instead of the Makefiles)?
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