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

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Message-ID: <a2ab7671-093d-4b7d-b0a2-2a6f73bb80e4@arm.com>
Date: Thu, 4 Sep 2025 12:07:04 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Yang Shi <yang@...amperecomputing.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 29/08/2025 23:08, Yang Shi wrote:
> 
> 
> 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.

Sorry I missed that. I see Catalin and Rb'ed again.

> 
> 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),
>>           {}
>>       };
>>   
>