linux-kernel - Re: [tip: sched/core] sched: Fix -Wmissing-prototype

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Message-ID: <20210917182616.GH4323@worktop.programming.kicks-ass.net>
Date:   Fri, 17 Sep 2021 20:26:16 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Peter Oskolkov <posk@...k.io>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org, x86@...nel.org
Subject: Re: [tip: sched/core] sched: Fix -Wmissing-prototype

On Fri, Sep 17, 2021 at 09:57:37AM -0700, Peter Oskolkov wrote:
> On Thu, Sep 16, 2021 at 4:59 AM tip-bot2 for Peter Zijlstra
> <tip-bot2@...utronix.de> wrote:
> >
> > The following commit has been merged into the sched/core branch of tip:
> >
> > Commit-ID:     98a3270911f7abe2871a60799c20c95c9f991ddb
> 
> $ make defconfig
> $ make -j16
> 
> ld: kernel/sched/core.o: in function `sched_free_group':
> core.c:(.text+0x2cfd): undefined reference to `free_rt_sched_group'
> ld: kernel/sched/core.o: in function `sched_create_group':
> core.c:(.text+0xbdcb): undefined reference to `alloc_rt_sched_group'
> ld: kernel/sched/core.o: in function `sched_init':
> core.c:(.init.text+0x335): undefined reference to `init_cfs_bandwidth'
> ld: kernel/sched/fair.o: in function `alloc_fair_sched_group':
> fair.c:(.text+0x8427): undefined reference to `init_cfs_bandwidth'
> make: *** [Makefile:1196: vmlinux] Error 1
> 
> Reverting this patch fixes the issue.

Moo, ok, I'll go figure that out ... too damn many CONFIG_ knobs is
what.