linux-kernel - Re: [tip:sched/core] sched/core: Optimize sched_feat() for !SCHED

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Message-ID: <20171108130501.ichjfrmq4r5yrqmq@gmail.com>
Date:   Wed, 8 Nov 2017 14:05:01 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     hpa@...or.com, vincent.guittot@...aro.org, juri.lelli@...hat.com,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        morten.rasmussen@....com, dietmar.eggemann@....com,
        peterz@...radead.org, brendan.jackman@....com,
        torvalds@...ux-foundation.org, chris.redpath@....com,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/core: Optimize sched_feat() for
 !SCHED_DEBUG builds


* Patrick Bellasi <patrick.bellasi@....com> wrote:

> On 08-Nov 11:02, Patrick Bellasi wrote:
> > On 08-Nov 11:03, Ingo Molnar wrote:
> > > 
> > > * tip-bot for Patrick Bellasi <tipbot@...or.com> wrote:
> > > 
> > > > Commit-ID:  692ee9a79c14c9f707eeb03754a26b9427c0e005
> > > > Gitweb:     https://git.kernel.org/tip/692ee9a79c14c9f707eeb03754a26b9427c0e005
> > > > Author:     Patrick Bellasi <patrick.bellasi@....com>
> > > > AuthorDate: Tue, 7 Nov 2017 16:06:58 +0000
> > > > Committer:  Ingo Molnar <mingo@...nel.org>
> > > > CommitDate: Wed, 8 Nov 2017 10:17:29 +0100
> > > > 
> > > > sched/core: Optimize sched_feat() for !SCHED_DEBUG builds
> > > 
> > > Hm, I noticed this too late, but lots of architecture defconfig builds now produce 
> > > a ton of warnings:
> > > 
> > >  In file included from /home/mingo/tip/kernel/sched/idle.c:19:0:
> > >  /home/mingo/tip/kernel/sched/sched.h:1275:33: warning: 'sysctl_sched_features' defined but not used [-Wunused-variable]
> > >   static const_debug unsigned int sysctl_sched_features =
> > >                                   ^
> 
> Perhaps just using a "__maybe_unused" attribute should fix the problem.

Yeah, that would be OK in this case.

> Going to compile test with some more archs, can you tell me a
> defconfig failing for you?

Alpha was one of them - don't have the logs of the other warnings anymore.

Thanks,

	Ingo