From: Christoph Hellwig <hch@lst.de>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
David Hildenbrand <david@redhat.com>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
iommu@lists.linux-foundation.org, catalin.marinas@arm.com,
akpm@linux-foundation.org, will@kernel.org,
Christoph Hellwig <hch@lst.de>,
linux-arm-kernel@lists.infradead.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE
Date: Thu, 11 Feb 2021 09:01:48 +0100 [thread overview]
Message-ID: <20210211080148.GB14448@lst.de> (raw)
In-Reply-To: <1613024531-19040-3-git-send-email-anshuman.khandual@arm.com>
On Thu, Feb 11, 2021 at 11:52:10AM +0530, Anshuman Khandual wrote:
> MAX_ORDER which invariably depends on FORCE_MAX_ZONEORDER can be a variable
> for a given page size, depending on whether TRANSPARENT_HUGEPAGE is enabled
> or not. In certain page size and THP combinations HUGETLB_PAGE_ORDER can be
> greater than MAX_ORDER, making it unusable as pageblock_order.
>
> This enables HUGETLB_PAGE_SIZE_VARIABLE making pageblock_order a variable
> rather than the compile time constant HUGETLB_PAGE_ORDER which could break
> MAX_ORDER rule for certain configurations.
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
> arch/arm64/Kconfig | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index f39568b28ec1..8e3a5578f663 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1909,6 +1909,10 @@ config ARCH_ENABLE_THP_MIGRATION
> def_bool y
> depends on TRANSPARENT_HUGEPAGE
>
> +config HUGETLB_PAGE_SIZE_VARIABLE
Please move the definition of HUGETLB_PAGE_SIZE_VARIABLE to
mm/Kconfig and select it from the arch Kconfigfs instead of duplicating
the definition.
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next prev parent reply other threads:[~2021-02-11 8:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 6:22 [PATCH 0/3] mm/page_alloc: Fix pageblock_order with HUGETLB_PAGE_SIZE_VARIABLE Anshuman Khandual
2021-02-11 6:22 ` [PATCH 1/3] mm/page_alloc: Fix pageblock_order when HUGETLB_PAGE_ORDER >= MAX_ORDER Anshuman Khandual
2021-02-11 8:00 ` Christoph Hellwig
2021-02-12 7:12 ` Anshuman Khandual
2021-02-11 6:22 ` [PATCH 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE Anshuman Khandual
2021-02-11 8:01 ` Christoph Hellwig [this message]
2021-02-12 7:13 ` Anshuman Khandual
2021-02-11 6:22 ` [PATCH 3/3] dma-contiguous: Type cast MAX_ORDER as unsigned int Anshuman Khandual
2021-02-11 8:04 ` Christoph Hellwig
2021-02-12 7:19 ` Anshuman Khandual
2021-02-11 8:37 ` [PATCH 0/3] mm/page_alloc: Fix pageblock_order with HUGETLB_PAGE_SIZE_VARIABLE David Hildenbrand
2021-02-12 7:02 ` Anshuman Khandual
2021-02-12 9:39 ` David Hildenbrand
2021-02-16 9:02 ` Anshuman Khandual
2021-02-16 9:04 ` David Hildenbrand
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