linux-kernel - Re: [PATCH 1/2] powerpc: remove set but not used variable 'force_printk_to

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Date:   Thu, 8 Apr 2021 07:01:58 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Yu Kuai <yukuai3@...wei.com>, mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com
Subject: Re: [PATCH 1/2] powerpc: remove set but not used variable
 'force_printk_to_btext'



Le 08/04/2021 à 03:18, Yu Kuai a écrit :
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> arch/powerpc/kernel/btext.c:49:12: error: 'force_printk_to_btext'
> defined but not used.

You don't get this error as it is now.
You will get this error only if you make it 'static', which is what you did in your first patch 
based on the 'sparse' report.

When removing a non static variable, you should explain that you can remove it after you have 
verifier that it is nowhere used, neither in that file nor in any other one.

> 
> It is never used, and so can be removed.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>   arch/powerpc/kernel/btext.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
> index 803c2a45b22a..359d0f4ca532 100644
> --- a/arch/powerpc/kernel/btext.c
> +++ b/arch/powerpc/kernel/btext.c
> @@ -46,7 +46,6 @@ unsigned long disp_BAT[2] __initdata = {0, 0};
>   static unsigned char vga_font[cmapsz];
>   
>   int boot_text_mapped __force_data = 0;
> -int force_printk_to_btext = 0;
>   
>   extern void rmci_on(void);
>   extern void rmci_off(void);
>