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SubjectRe: [PATCH] arm64/sysreg: Update ID_AA64MMFR2_EL1 register
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On 4/19/24 19:16, Will Deacon wrote:
> On Fri, Apr 19, 2024 at 07:43:25AM +0530, Anshuman Khandual wrote:
>> This updates ID_AA64MMFR2_EL1.VARange register fields as per the definition
>> based on DDI0601 2024-03.
>>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Will Deacon <will@kernel.org>
>> Cc: Mark Brown <broonie@kernel.org>
>> Cc: linux-arm-kernel@lists.infradead.org
>> Cc: linux-kernel@vger.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
>> ---
>> This applies on v6.9-rc4
>>
>> arch/arm64/tools/sysreg | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
>> index a4c1dd4741a4..6d7213dcbeb5 100644
>> --- a/arch/arm64/tools/sysreg
>> +++ b/arch/arm64/tools/sysreg
>> @@ -1739,6 +1739,7 @@ EndEnum
>> UnsignedEnum 19:16 VARange
>> 0b0000 48
>> 0b0001 52
>> + 0b0010 56
>
> Is anybody using this? I'm not sure there's a lot of value in adding
> these fields one-by-one for the sake of completeness.

This is not being used currently but will be required for upcoming
features. I was under the impression that register fields (atleast
for the ID registers) should be kept updated, with latest released
spec ? Besides lately arch/arm64/tools/sysreg serves as very good
reference for all necessary register fields.

https://developer.arm.com/documentation/ddi0601/2024-03/AArch64-Registers/ID-AA64MMFR2-EL1--AArch64-Memory-Model-Feature-Register-2

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