linux-kernel - Re: [tree] ftrace, v16

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Message-ID: <20080612091818.GD15312@elte.hu>
Date:	Thu, 12 Jun 2008 11:18:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [tree] ftrace, v16


* Sam Ravnborg <sam@...nborg.org> wrote:

> Hi Ingo
> 
> >       kbuild: create new CFLAGS_REMOVE_(basename).o option
> 
> But no changes to Documentation/kbuild/makefiles.txt
> 
> Documentation must be included for new kbuild features.
> 
> 
> > +ifdef CONFIG_DYNAMIC_FTRACE
> > +CFLAGS_REMOVE_ftrace.o = -pg
> > +endif
> 
> I can see where this comes from as we have:
> 
>     CFLAGS_ftrace.o := -foobar
> 
> But in all cases below I see the pattern:
> 
> ifdef CONFIG_FOO_BAR
> CFLAGS_REMOVE_foobar.o = -pg
> endif
> 
> And it would be nice to get this on one line instead.
> And use a syntax we can somehow remember.
> 
> Today we have:
>     ccflags-y := -foobar
> 
> to add options valid for the whole file.
> So we should then add:
> - possibility to remove an option valid for the whole file
> - add/remove an option for a single file
> 
> The suggested syntax:
> ccflags-remove-y := -foobar
> ccflags-<file.o>-y := -foobar
> ccflags-remove-<file.o>-y := -foobar
> 
> So in the case above for ftrace we would use:
> 
> ccflags-remove-ftrace.o-$(CONFIG_DYNAMIC_FTRACE) := -pg
> 
> Comments?

sounds like a good cleanup to me. Would you be interested in sending 
patches for this?

	Ingo
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