linux-kernel - Re: [tip:sched/core 14/47] kernel/sched/fair.c:893:22: error: variable 'p' set but not used

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Message-ID: <CALOAHbDkBn3LDsNvSXujMiQXrLHdRsfvJUqJv_eTh4s63osuTw@mail.gmail.com>
Date:   Wed, 13 Oct 2021 14:18:13 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, LKML <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>
Subject: Re: [tip:sched/core 14/47] kernel/sched/fair.c:893:22: error:
 variable 'p' set but not used

On Tue, Oct 12, 2021 at 9:35 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Tue, Oct 12, 2021 at 01:26:54PM +0200, Peter Zijlstra wrote:
>
> > Again, I have absolutely no intention of fixing this. IMO this is the
> > compiler being a total pain in the arse.
> >
> > Please stop reporting this.
>
> How's this then?
>
> diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
> index 978fcfca5871..b0d9121c5dce 100644
> --- a/kernel/sched/Makefile
> +++ b/kernel/sched/Makefile
> @@ -3,6 +3,10 @@ ifdef CONFIG_FUNCTION_TRACER
>  CFLAGS_REMOVE_clock.o = $(CC_FLAGS_FTRACE)
>  endif
>
> +# The compilers are complaining about unused variables inside an if(0) scope
> +# block. This is daft, shut them up.
> +ccflags-y += -Wno-unused-but-set-variable
> +
>  # These files are disabled because they produce non-interesting flaky coverage
>  # that is not a function of syscall inputs. E.g. involuntary context switches.
>  KCOV_INSTRUMENT := n

After this diff, the warnings disappear.

Tested-by: Yafang Shao <laoar.shao@...il.com>

-- 
Thanks
Yafang