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From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
	catalin.marinas@arm.com, akpm@linux-foundation.org
Cc: Anshuman Khandual <anshuman.khandual@arm.com>,
	Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Christoph Hellwig <hch@lst.de>,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: [RFC 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE
Date: Thu,  4 Feb 2021 12:31:23 +0530	[thread overview]
Message-ID: <1612422084-30429-3-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1612422084-30429-1-git-send-email-anshuman.khandual@arm.com>

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 175914f2f340..c4acf8230f20 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1918,6 +1918,10 @@ config ARCH_ENABLE_THP_MIGRATION
 	def_bool y
 	depends on TRANSPARENT_HUGEPAGE
 
+config HUGETLB_PAGE_SIZE_VARIABLE
+	def_bool y
+	depends on HUGETLB_PAGE
+
 menu "Power management options"
 
 source "kernel/power/Kconfig"
-- 
2.20.1



  parent reply	other threads:[~2021-02-04  7:01 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-04  7:01 [RFC 0/3] mm/page_alloc: Fix pageblock_order with HUGETLB_PAGE_SIZE_VARIABLE Anshuman Khandual
2021-02-04  7:01 ` [RFC 1/3] mm/page_alloc: Fix pageblock_order when HUGETLB_PAGE_ORDER >= MAX_ORDER Anshuman Khandual
2021-02-04  7:01 ` Anshuman Khandual [this message]
2021-02-05  8:20   ` [RFC 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE David Hildenbrand
2021-02-05  8:30     ` Anshuman Khandual
2021-02-04  7:01 ` [RFC 3/3] dma-contiguous: Type cast MAX_ORDER as unsigned int Anshuman Khandual
2021-02-08  4:40 ` [RFC 0/3] mm/page_alloc: Fix pageblock_order with HUGETLB_PAGE_SIZE_VARIABLE Anshuman Khandual

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