linux-kernel - Re: [PATCH] arm64: remove redundant 'if HAVE_ARCH

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Message-ID: <ZpUkTZYt5DSHP5aP@J2N7QTR9R3>
Date: Mon, 15 Jul 2024 14:29:49 +0100
From: Mark Rutland <mark.rutland@....com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: linux-kbuild@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: remove redundant 'if HAVE_ARCH_KASAN' in Kconfig

On Sun, Jul 14, 2024 at 07:58:46PM +0900, Masahiro Yamada wrote:
> The condition 'select HAVE_ARCH_KASAN' is always true because
> there is 'select HAVE_ARCH_KASAN' statement above.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Looks like we forgot to simplify this in commit:

  0383808e4d99ac31 ("arm64: kasan: Reduce minimum shadow alignment and enable 5 level paging")

... where we began selecting HAVE_ARCH_KASAN unconditionally.

FWIW:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
> 
>  arch/arm64/Kconfig | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index c87d16b12e9b..d37cbfc3031e 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -167,9 +167,9 @@ config ARM64
>  	select HAVE_ARCH_JUMP_LABEL
>  	select HAVE_ARCH_JUMP_LABEL_RELATIVE
>  	select HAVE_ARCH_KASAN
> -	select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
> -	select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
> -	select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE)
> +	select HAVE_ARCH_KASAN_VMALLOC
> +	select HAVE_ARCH_KASAN_SW_TAGS
> +	select HAVE_ARCH_KASAN_HW_TAGS if ARM64_MTE
>  	# Some instrumentation may be unsound, hence EXPERT
>  	select HAVE_ARCH_KCSAN if EXPERT
>  	select HAVE_ARCH_KFENCE
> -- 
> 2.43.0
> 
>