linux-kernel - Re: [PATCH 2/2] powerpc: make 'boot_text

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Date:   Thu, 8 Apr 2021 07:04:35 +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 2/2] powerpc: make 'boot_text_mapped' static



Le 08/04/2021 à 03:18, Yu Kuai a écrit :
> The sparse tool complains as follow:
> 
> arch/powerpc/kernel/btext.c:48:5: warning:
>   symbol 'boot_text_mapped' was not declared. Should it be static?
> 
> This symbol is not used outside of btext.c, so this commit make
> it static.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>   arch/powerpc/kernel/btext.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
> index 359d0f4ca532..8df9230be6fa 100644
> --- a/arch/powerpc/kernel/btext.c
> +++ b/arch/powerpc/kernel/btext.c
> @@ -45,7 +45,7 @@ unsigned long disp_BAT[2] __initdata = {0, 0};
>   
>   static unsigned char vga_font[cmapsz];
>   
> -int boot_text_mapped __force_data = 0;
> +static int boot_text_mapped __force_data;

Are you sure the initialisation to 0 can be removed ? Usually initialisation to 0 is not needed 
because not initialised variables go in the BSS section which is zeroed at startup. But here the 
variable is flagged with __force_data so it is not going in the BSS section.


>   
>   extern void rmci_on(void);
>   extern void rmci_off(void);
>