linux-kernel - Re: [PATCH v2 04/17] arm64: Introduce pmd_thp_or

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Message-ID: <20160415151703.GP22906@arm.com>
Date:	Fri, 15 Apr 2016 16:17:04 +0100
From:	Will Deacon <will.deacon@....com>
To:	Suzuki K Poulose <suzuki.poulose@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
	marc.zyngier@....com, christoffer.dall@...aro.org,
	mark.rutland@....com, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
	Steve Capper <steve.capper@...aro.org>
Subject: Re: [PATCH v2 04/17] arm64: Introduce pmd_thp_or_huge

On Thu, Apr 14, 2016 at 02:20:52PM +0100, Suzuki K Poulose wrote:
> Add a helper to determine if a given pmd represents a huge page
> either by hugetlb or thp, as we have for arm. This will be used
> by KVM MMU code.
> 
> Suggested-by: Mark Rutland <mark.rutland@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Steve Capper <steve.capper@...aro.org>
> Cc: Will Deacon <will.deacon@....com>
> Acked-by: Christoffer Dall <christoffer.dall@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  arch/arm64/include/asm/pgtable.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index 989fef1..dda4aa9 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -290,6 +290,8 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)
>  #define pmd_mkyoung(pmd)	pte_pmd(pte_mkyoung(pmd_pte(pmd)))
>  #define pmd_mknotpresent(pmd)	(__pmd(pmd_val(pmd) & ~PMD_TYPE_MASK))
>  
> +#define pmd_thp_or_huge(pmd)	(pmd_huge(pmd) || pmd_trans_huge(pmd))

Acked-by: Will Deacon <will.deacon@....com>

Will