linux-kernel - Re: [PATCH v7 2/6] arm64: cpufeature: add AmpereOne to BBML2 allow list

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Message-ID: <b3f4e006-6101-496f-a4a5-13474470109d@os.amperecomputing.com>
Date: Fri, 29 Aug 2025 15:08:23 -0700
From: Yang Shi <yang@...amperecomputing.com>
To: Ryan Roberts <ryan.roberts@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Ard Biesheuvel <ardb@...nel.org>, Dev Jain <dev.jain@....com>,
 scott@...amperecomputing.com, cl@...two.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org
Subject: Re: [PATCH v7 2/6] arm64: cpufeature: add AmpereOne to BBML2 allow
 list



On 8/29/25 4:52 AM, Ryan Roberts wrote:
> From: Yang Shi <yang@...amperecomputing.com>
>
> AmpereOne supports BBML2 without conflict abort, add to the allow list.
>
> Signed-off-by: Yang Shi <yang@...amperecomputing.com>
> Reviewed-by: Christoph Lameter (Ampere) <cl@...two.org>
> Reviewed-by: Ryan Roberts <ryan.roberts@....com>

I saw Catalin gave Reviewed-by to v6 of this patch, I think we can keep it.

Yang

> ---
>   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 9ad065f15f1d..b93f4ee57176 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -2234,6 +2234,8 @@ 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),
>   		{}
>   	};
>