linux-kernel - Re: [PATCH v9 5/8] arm64: Move hugetlb related definitions out of pgtable.h to page-defs.h

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Date:   Mon, 9 Sep 2019 10:52:06 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        virtio-dev@...ts.oasis-open.org, kvm@...r.kernel.org,
        mst@...hat.com, catalin.marinas@....com, dave.hansen@...el.com,
        linux-kernel@...r.kernel.org, willy@...radead.org,
        mhocko@...nel.org, linux-mm@...ck.org, akpm@...ux-foundation.org,
        will@...nel.org, linux-arm-kernel@...ts.infradead.org,
        osalvador@...e.de
Cc:     yang.zhang.wz@...il.com, pagupta@...hat.com,
        konrad.wilk@...cle.com, nitesh@...hat.com, riel@...riel.com,
        lcapitulino@...hat.com, wei.w.wang@...el.com, aarcange@...hat.com,
        ying.huang@...el.com, pbonzini@...hat.com,
        dan.j.williams@...el.com, fengguang.wu@...el.com,
        alexander.h.duyck@...ux.intel.com, kirill.shutemov@...ux.intel.com
Subject: Re: [PATCH v9 5/8] arm64: Move hugetlb related definitions out of
 pgtable.h to page-defs.h

On 07.09.19 19:25, Alexander Duyck wrote:
> From: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
> 
> Move the static definition for things such as HUGETLB_PAGE_ORDER out of
> asm/pgtable.h and place it in page-defs.h. By doing this the includes
> become much easier to deal with as currently arm64 is the only architecture
> that didn't include this definition in the asm/page.h file or a file
> included by it.
> 
> It also makes logical sense as PAGE_SHIFT was already defined in
> page-defs.h so now we also have HPAGE_SHIFT defined there as well.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
> ---
>  arch/arm64/include/asm/page-def.h |    9 +++++++++
>  arch/arm64/include/asm/pgtable.h  |    9 ---------
>  2 files changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/page-def.h b/arch/arm64/include/asm/page-def.h
> index f99d48ecbeef..1c5b079e2482 100644
> --- a/arch/arm64/include/asm/page-def.h
> +++ b/arch/arm64/include/asm/page-def.h
> @@ -20,4 +20,13 @@
>  #define CONT_SIZE		(_AC(1, UL) << (CONT_SHIFT + PAGE_SHIFT))
>  #define CONT_MASK		(~(CONT_SIZE-1))
>  
> +/*
> + * Hugetlb definitions.
> + */
> +#define HUGE_MAX_HSTATE		4
> +#define HPAGE_SHIFT		PMD_SHIFT
> +#define HPAGE_SIZE		(_AC(1, UL) << HPAGE_SHIFT)
> +#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
> +#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
> +

I wonder if you should initially limit "config PAGE_REPORTING" to x86
only and unlock it for the other targets once we actually test it there.
Or did you test PAGE_REPORTING on other architectures as well?

-- 

Thanks,

David / dhildenb