linux-kernel - [PATCH 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE

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Date:   Thu, 11 Feb 2021 11:52:10 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        catalin.marinas@....com, akpm@...ux-foundation.org, will@...nel.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Robin Murphy <robin.murphy@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Christoph Hellwig <hch@....de>,
        David Hildenbrand <david@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE

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@....com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....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
+	def_bool y
+	depends on HUGETLB_PAGE
+
 menu "Power management options"
 
 source "kernel/power/Kconfig"
-- 
2.20.1