linux-kernel - Re: [PATCH 1/1] sysctl: Fix 'one_thousand' defined but not used warning

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Date:   Sun, 23 Jan 2022 22:24:19 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org
Subject: Re: [PATCH 1/1] sysctl: Fix 'one_thousand' defined but not used
 warning

Hi Jisheng,

On Sun, 23 Jan 2022 17:09:36 +0800 Jisheng Zhang <jszhang@...nel.org> wrote:
>
> On Sun, Jan 16, 2022 at 05:23:17PM -0800, Suren Baghdasaryan wrote:
> > Fix the following warning issued when CONFIG_PERF_EVENTS is not
> > defined:
> > 
> > kernel/sysctl.c:125:12: warning: 'one_thousand' defined but not used [-Wunused-variable]
> > 
> > Fixes: 39c65a94cd96 ("mm/pagealloc: sysctl: change watermark_scale_factor max limit to 30%")
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> > ---
> >  kernel/sysctl.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> > index ef77be575d87..81a6f2d47f77 100644
> > --- a/kernel/sysctl.c
> > +++ b/kernel/sysctl.c
> > @@ -122,7 +122,9 @@ static unsigned long one_ul = 1;
> >  static unsigned long long_max = LONG_MAX;
> >  static int one_hundred = 100;
> >  static int two_hundred = 200;
> > +#ifdef CONFIG_PERF_EVENTS
> >  static int one_thousand = 1000;  
> 
> what about moving one_thousand definition below to group it with
> six_hundred_forty_kb var together, so that we can avoid one
> #ifdef CONFIG_PERF_EVENTS ... #endif
> 
> > +#endif
> >  static int three_thousand = 3000;
> >  #ifdef CONFIG_PRINTK
> >  static int ten_thousand = 10000;
> > -- 
> > 2.34.1.703.g22d0c6ccf7-goog
> >   

This has been fixed in Linus' current tree.

-- 
Cheers,
Stephen Rothwell

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