linux-kernel - Re: [PATCH V6 1/3] tools: header: arm64: Replace TCR_NFD[0|1] with TCR_EL1

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Message-ID: <aQjm7wmvHa79hkyi@arm.com>
Date: Mon, 3 Nov 2025 17:31:27 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Mark Brown <broonie@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>, kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>, Leo Yan <leo.yan@....com>
Subject: Re: [PATCH V6 1/3] tools: header: arm64: Replace TCR_NFD[0|1] with
 TCR_EL1_NFD[0|1]

On Mon, Oct 13, 2025 at 10:59:43AM +0530, Anshuman Khandual wrote:
> Replace TCR_NFD[0|1] (used in TCR_CLEAR_FUJITSU_ERRATUM_010001) with field
> definitions which are available in tool sysreg format. Helps in completely
> dropping off the adhoc TCR_NFD[0|1] macros later.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Leo Yan <leo.yan@....com>
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>  tools/arch/arm64/include/asm/cputype.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/arch/arm64/include/asm/cputype.h b/tools/arch/arm64/include/asm/cputype.h
> index 139d5e87dc95..dfa12df5e290 100644
> --- a/tools/arch/arm64/include/asm/cputype.h
> +++ b/tools/arch/arm64/include/asm/cputype.h
> @@ -243,7 +243,7 @@
>  /* Fujitsu Erratum 010001 affects A64FX 1.0 and 1.1, (v0r0 and v1r0) */
>  #define MIDR_FUJITSU_ERRATUM_010001		MIDR_FUJITSU_A64FX
>  #define MIDR_FUJITSU_ERRATUM_010001_MASK	(~MIDR_CPU_VAR_REV(1, 0))
> -#define TCR_CLEAR_FUJITSU_ERRATUM_010001	(TCR_NFD1 | TCR_NFD0)
> +#define TCR_CLEAR_FUJITSU_ERRATUM_010001	(TCR_EL1_NFD1 | TCR_EL1_NFD0)

Isn't this file usually updated automatically (well, someone running a
script to sync) from the corresponding arch/arm64/ one?

-- 
Catalin