linux-kernel - Re: [PATCH] Don't mkdir -p include/config in the sourcetree when using O=outputdir option

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Date:	Thu, 07 Jan 2010 12:19:58 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	John Kacur <jkacur@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] Don't mkdir -p include/config in the sourcetree when
 	using O=outputdir option

On 6.1.2010 23:30, John Kacur wrote:
> On Wed, Jan 6, 2010 at 9:45 PM, Michal Marek <mmarek@...e.cz> wrote:
> Michal: The length of time that a bug exists in a piece of code is no
> argument for
> it's correctness!

>From your original post I though it fails reliably for you. If it's a
race, then you're right, the time it was introduced is irrelevant :-).


> I tried to debug this using
> make -d V=1 O=/bld/2.6.33-rc3
> and discovered that the bug did not always occur, but did sometimes.
> This leads me to think that it is timing sensitive, and indeed the
> problem shows up
> more easily on a machine with multiple processors.
> 
> Is it possible that the step with mkdir -p can sometimes occur in a
> Makefile parallel process
> before the cd KBUILD_OUTPUT occurs? That would explain why it doesn't
> reliably reproduce.

OK, I still don't see how it fails, but adding $(objtree) there is a
valid change and if it fixes your problem, let's apply it.

Michal
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