linux-kernel - Re: [PATCH] perf: Add util/include/linux/config.h for including generated autoconf.h of kernel

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Message-ID: <20100128222713.GC2585@brick.ozlabs.ibm.com>
Date:	Fri, 29 Jan 2010 09:27:13 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf: Add util/include/linux/config.h for including
 generated autoconf.h of kernel

On Thu, Jan 28, 2010 at 11:28:48PM +0900, Hitoshi Mitake wrote:

> I'd like to add util/include/linux/config.h,
> this header file includes autoconf.h which is generated
> by build phase of kernel.
> 
> This makes building of perf depend on building of kernel.
> It's a little dirty. But perf has tight relation
> of its kernel, so I don't think that it is a serious problem.
> 
> My original purpose of making this patch is
> knowing size of void *.
> If config.h is available,
> CONFIG_ARCH_PHYS_ADDR_T_64BIT will be provided for source of perf,
> we can know size of void * by this config.
> 
> How do you think?

How will this work if I built the kernel in a separate object
directory (e.g., using "make O=../builddir vmlinux")?  I think that
trying to include generated files will fail in that case.

In general I think that tying perf to the kernel config is a bad idea.

Paul.
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