linux-kernel - Re: [PATCH 27/27] perf tools: Add kbuild support into Makefile.kbuild

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Date:	Mon, 1 Apr 2013 23:05:51 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Michal Marek <mmarek@...e.cz>,
	linux-kbuild@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 27/27] perf tools: Add kbuild support into Makefile.kbuild

On Mon, Apr 01, 2013 at 10:03:42PM +0200, Sam Ravnborg wrote:
> On Mon, Apr 01, 2013 at 09:18:50PM +0200, Jiri Olsa wrote:
> > Adding kbuild support into Makefile.kbuild. The 'legacy'
> > Makefile still stays untouched as it was.
> 
> When readign the Kbuild file I get confused.
> the obj-y syntax is used for kernel built-in stuff,
> and obj-m for modules.
> I had expected either a perf specific syntax or something like the
> syntax used for host programs.

While building kernel you need to have separate flags
for internal objects and for host programs.

First, I thought I need to separate it as you say, but
perf build is separated from kernel built process, so
AFAICS we can use obj-y with no harm in perf.

It's quite possible I missed something and kbuild folks
prove me wrong ;-)

The Makefile.kbuild defines flags to be used for obj-y.

jirka
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