linux-kernel - Re: kbuild: possible regression?

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Message-ID: <20071108215449.GA28242@uranus.ravnborg.org>
Date:	Thu, 8 Nov 2007 22:54:49 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jan Altenberg <jan.altenberg@...utronix.de>
Cc:	miltonm@....com, linux-kernel@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>, tglx@...utronix.de
Subject: Re: kbuild: possible regression?

On Thu, Nov 08, 2007 at 08:45:01PM +0100, Jan Altenberg wrote:
> Hi Sam,
> 
> > > commit 0b35786d77ba4037f181982cc8ca20a7a3bf0fd2
> > > Author: Milton Miller <miltonm@....com>
> > > Date:   Fri Sep 21 18:09:02 2007 -0500
> > > 
> > >     kbuild: call make once for all targets when O=.. is used
> > >     
> > >     Change the invocations of make in the output directory Makefile and the
> > >     main Makefile for separate object trees to pass all goals to one $(MAKE)
> > >     via a new phony target "sub-make" and the existing target _all.
> > >     
> > >     When compiling with separate object directories, a separate make is called
> > >     in the context of another directory (from the output directory the main
> > >     Makefile is called, the Makefile is then restarted with current directory
> > >     set to the object tree).  Before this patch, when multiple make command
> > >     goals are specified, each target results in a separate make invocation.
> > >     With make -j, these invocations may run in parallel, resulting in multiple
> > >     commands running in the same directory clobbering each others results.
> > >     
> > >     I did not try to address make -j for mixed dot-config and no-dot-config
> > >     targets.  Because the order does matter, a solution was not obvious.
> > >     Perhaps a simple check for MAKEFLAGS having -j and refusing to run would
> > >     be appropriate.
> > >     
> > >     Signed-off-by: Milton Miller <miltonm@....com>
> > >     Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> > > 
> > > So, am I facing a kbuild regression?
> > 
> > Yes - I will try to fix it during the weekend (if Milton does not beat me).
> > Thanks for reporting and bisecting!
> 
> Have you made any progress on this? Let me know, if I can assist with
> testing.

Hi Jan.

Not at all. My limited linux time goes into some x86 unification
that I have given higher priority.
But your report is saved and I will return to it.

	Sam
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