linux-kernel - Re: [PATCH 2/4] arm64: cpufeature: add AmpereOne to BBML2 allow list

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Message-ID: <bb17a56c-00ea-4dcf-906f-e77de212c95f@arm.com>
Date: Fri, 1 Aug 2025 15:36:13 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Yang Shi <yang@...amperecomputing.com>, will@...nel.org,
 catalin.marinas@....com, akpm@...ux-foundation.org, Miko.Lenczewski@....com,
 dev.jain@....com, scott@...amperecomputing.com, cl@...two.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] arm64: cpufeature: add AmpereOne to BBML2 allow list

On 24/07/2025 23:11, Yang Shi wrote:
> AmpereOne supports BBML2 without conflict abort, add to the allow list.
> 
> Signed-off-by: Yang Shi <yang@...amperecomputing.com>

Reviewed-by: Ryan Roberts <ryan.roberts@....com>

> ---
>  arch/arm64/kernel/cpufeature.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 7a3c404288d5..d2a8a509a58e 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -2230,6 +2230,8 @@ static bool has_bbml2_noabort(const struct arm64_cpu_capabilities *caps, int sco
>  	static const struct midr_range supports_bbml2_noabort_list[] = {
>  		MIDR_REV_RANGE(MIDR_CORTEX_X4, 0, 3, 0xf),
>  		MIDR_REV_RANGE(MIDR_NEOVERSE_V3, 0, 2, 0xf),
> +		MIDR_ALL_VERSIONS(MIDR_AMPERE1),
> +		MIDR_ALL_VERSIONS(MIDR_AMPERE1A),
>  		{}
>  	};
>