linux-kernel - Re: [PATCH v2] kexec: fix warnig of crash_zero

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Date:   Mon, 24 Jun 2019 09:53:59 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Tiezhu Yang <kernelpatch@....com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, linux-kernel@...r.kernel.org, vgoyal@...hat.com
Subject: Re: [PATCH v2] kexec: fix warnig of crash_zero_bytes in crash.c

On 06/24/19 at 09:35am, Dave Young wrote:
> On 06/23/19 at 06:24am, Tiezhu Yang wrote:
> > Fix the following sparse warning:
> > 
> > arch/x86/kernel/crash.c:59:15:
> > warning: symbol 'crash_zero_bytes' was not declared. Should it be static?
> > 
> > First, make crash_zero_bytes static. In addition, crash_zero_bytes
> > is used when CONFIG_KEXEC_FILE is set, so make it only available
> > under CONFIG_KEXEC_FILE. Otherwise, if CONFIG_KEXEC_FILE is not set,
> > the following warning will appear when make crash_zero_bytes static:
> > 
> > arch/x86/kernel/crash.c:59:22:
> > warning: ‘crash_zero_bytes’ defined but not used [-Wunused-variable]
> > 
> > Fixes: dd5f726076cc ("kexec: support for kexec on panic using new system call")
> > Signed-off-by: Tiezhu Yang <kernelpatch@....com>
> > Cc: Vivek Goyal <vgoyal@...hat.com>
> > ---
> >  arch/x86/kernel/crash.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
> > index 576b2e1..f13480e 100644
> > --- a/arch/x86/kernel/crash.c
> > +++ b/arch/x86/kernel/crash.c
> > @@ -56,7 +56,9 @@ struct crash_memmap_data {
> >   */
> >  crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss = NULL;
> >  EXPORT_SYMBOL_GPL(crash_vmclear_loaded_vmcss);
> > -unsigned long crash_zero_bytes;
> > +#ifdef CONFIG_KEXEC_FILE
> > +static unsigned long crash_zero_bytes;
> > +#endif
> >  
> >  static inline void cpu_crash_vmclear_loaded_vmcss(void)
> >  {
> > -- 
> > 1.8.3.1
> 
> Acked-by: Dave Young <dyoung@...hat.com>

BTW, a soft reminder, for kexec patches, it would be better to cc kexec mail
list.

> 
> Thanks
> Dave
>