linux-kernel - Re: [PATCH] MIPS: Malta: Enable BLK_DEV

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Date:   Tue, 8 Feb 2022 18:53:58 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] MIPS: Malta: Enable BLK_DEV_INITRD

On Tue, Feb 08, 2022 at 12:17:26PM -0700, Nathan Chancellor wrote:
> This configuration is useful for boot testing malta_defconfig in QEMU
> with just a simple cpio initrd, instead of a full ext4 rootfs.
> 
> This results in an increase of ~164KB of vmlinux (with GCC 11.2.0):
> 
> $ diskus vmlinux.before
> 11.19 MB (11,194,368 bytes)
> 
> $ diskus vmlinux.after
> 11.36 MB (11,358,208 bytes)
> 
> This size increase comes from the fact that usr/Kconfig is sourced when
> CONFIG_BLK_DEV_INITRD is enabled, which defaults to supporting several
> decompression algorithms for compressed initrds. This seems like a
> reasonable tradeoff but these configurations could be disabled in the
> future if there are complaints about the size increase.
> 
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

I'm all for having a regular way to test all defconfigs. So, FWIW:

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  arch/mips/configs/malta_defconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/mips/configs/malta_defconfig b/arch/mips/configs/malta_defconfig
> index 3321bb576944..3456ac8ded6c 100644
> --- a/arch/mips/configs/malta_defconfig
> +++ b/arch/mips/configs/malta_defconfig
> @@ -4,6 +4,7 @@ CONFIG_HIGH_RES_TIMERS=y
>  CONFIG_LOG_BUF_SHIFT=15
>  CONFIG_NAMESPACES=y
>  CONFIG_RELAY=y
> +CONFIG_BLK_DEV_INITRD=y
>  CONFIG_EXPERT=y
>  # CONFIG_COMPAT_BRK is not set
>  CONFIG_SLAB=y
> 
> base-commit: dfd42facf1e4ada021b939b4e19c935dcdd55566
> -- 
> 2.35.1
> 

-- 
Kees Cook