linux-kernel - Re: [PATCH] efi: EFI_EARLYCON should depend on EFI

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Date:   Wed, 25 Nov 2020 08:21:00 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     "ardb@...nel.org" <ardb@...nel.org>,
        "geert@...ux-m68k.org" <geert@...ux-m68k.org>
CC:     "mingo@...nel.org" <mingo@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] efi: EFI_EARLYCON should depend on EFI

On Tue, 2020-11-24 at 20:16 +0100, Geert Uytterhoeven wrote:
> CONFIG_EFI_EARLYCON defaults to yes, and thus is enabled on systems that
> do not support EFI, or do not have EFI support enabled, but do satisfy
> the symbol's other dependencies.
> 
> While drivers/firmware/efi/ won't be entered during the build phase if
> CONFIG_EFI=n, and drivers/firmware/efi/earlycon.c itself thus won't be
> built, enabling EFI_EARLYCON does force-enable CONFIG_FONT_SUPPORT and
> CONFIG_ARCH_USE_MEMREMAP_PROT, and CONFIG_FONT_8x16, which is
> undesirable.
> 
> Fix this by making CONFIG_EFI_EARLYCON depend on CONFIG_EFI.
> 
> This reduces kernel size on headless systems by more than 4 KiB.
> 
> Fixes: 69c1f396f25b805a ("efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  drivers/firmware/efi/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> index b452cfa2100b401c..1dd1f7784f0888ff 100644
> --- a/drivers/firmware/efi/Kconfig
> +++ b/drivers/firmware/efi/Kconfig
> @@ -270,7 +270,7 @@ config EFI_DEV_PATH_PARSER
>  
> 
>  config EFI_EARLYCON
>  	def_bool y
> -	depends on SERIAL_EARLYCON && !ARM && !IA64
> +	depends on EFI && SERIAL_EARLYCON && !ARM && !IA64
>  	select FONT_SUPPORT
>  	select ARCH_USE_MEMREMAP_PROT
>  
> 

Looks good to me.
Reviewed-by: Damien Le Moal <damien.lemoal@....com>

-- 
Damien Le Moal
Western Digital