linux-kernel - Re: [RFC V2 04/10] arm64/mm: Add FEAT_LPA2 specific ID

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Date:   Thu, 5 Aug 2021 18:06:36 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        suzuki.poulose@....com, mark.rutland@....com, will@...nel.org,
        maz@...nel.org, james.morse@....com, steven.price@....com
Subject: Re: [RFC V2 04/10] arm64/mm: Add FEAT_LPA2 specific
 ID_AA64MMFR0.TGRAN[2]

On Mon, Jul 26, 2021 at 12:07:19PM +0530, Anshuman Khandual wrote:
> PAGE_SIZE support is tested against possible minimum and maximum values for
> its respective ID_AA64MMFR0.TGRAN field, depending on whether it is signed
> or unsigned. But then FEAT_LPA2 implementation needs to be validated for 4K
> and 16K page sizes via feature specific ID_AA64MMFR0.TGRAN values. Hence it
> adds FEAT_LPA2 specific ID_AA64MMFR0.TGRAN[2] values per ARM ARM (0487G.A).
> 
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Acked-by: Catalin Marinas <catalin.marinas@....com>