linux-kernel - Re: linux-next: build failure after merge of the tip tree

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Message-ID: <20161207144935.GH8257@kernel.org>
Date:   Wed, 7 Dec 2016 11:49:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Peter Foley <pefoley2@...oley.com>,
        Wang Nan <wangnan0@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the tip tree

Em Wed, Dec 07, 2016 at 09:12:15AM +0100, Jiri Olsa escreveu:
> On Wed, Dec 07, 2016 at 08:45:14AM +0100, Ingo Molnar wrote:
> 
> SNIP
> 
> > * Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > 
> > > Hi all,
> > > 
> > > After merging the tip tree, today's linux-next build (powerpc64le perf)
> > > failed like this:
> > > 
> > >   LINK     /home/sfr/next/perf/fixdep
> > > /bin/sh: 1: /home/sfr/next/perf//fixdep: Permission denied
> > > tools/build/Makefile.build:91: recipe for target '/home/sfr/next/perf/pmu-events/jevents.o' failed
> > > 
> > > $ ls -l /home/sfr/next/perf/fixdep
> > > -rwxr-xr-x 1 sfr users 71104 Dec  7 12:26 /home/sfr/next/perf/fixdep
> > > 
> > > I am not sure what caused this, but redoing the build succeeded, so I
> > > have just filed this report and left it for today.
> 
> this seems to be the rare race issue caused by missing fixdep dependency,
> caused probably by recompiling of fixdep because of its change in the merge
> 
> Arnaldo already carries a fix for this in his latest perf/core, where
> we moved the fixdep compilation on top of everything to kill any future
> race due to missing fixdep dependency

I'll push it today, will stop processing other stuff now and prepare a
pull request,

- Arnaldo
 
> thanks,
> jirka