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

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Message-ID: <20190624013520.GA2976@dhcp-128-65.nay.redhat.com>
Date:   Mon, 24 Jun 2019 09:35:20 +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 06/23/19 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>

Thanks
Dave