The patch titled
Subject: arm64: mm: re-enable OPTIMIZE_HUGETLB_VMEMMAP
has been added to the -mm mm-unstable branch. Its filename is
arm64-mm-re-enable-optimize_hugetlb_vmemmap.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-mm-re-enable-optimize_hugetlb_vmemmap.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Nanyong Sun <sunnanyong@xxxxxxxxxx>
Subject: arm64: mm: re-enable OPTIMIZE_HUGETLB_VMEMMAP
Date: Sat, 13 Jan 2024 17:44:36 +0800
Now update of vmemmap page table can follow the rule of break-before-make
safely for arm64 architecture, re-enable HVO on arm64.
Link: https://lkml.kernel.org/r/20240113094436.2506396-4-sunnanyong@xxxxxxxxxx
Signed-off-by: Nanyong Sun <sunnanyong@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- a/arch/arm64/Kconfig~arm64-mm-re-enable-optimize_hugetlb_vmemmap
+++ a/arch/arm64/Kconfig
@@ -104,6 +104,7 @@ config ARM64
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
+ select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
select ARCH_WANT_LD_ORPHAN_WARN
select ARCH_WANTS_NO_INSTR
select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES
_
Patches currently in -mm which might be from sunnanyong@xxxxxxxxxx are
mm-hvo-introduce-helper-function-to-update-and-flush-pgtable.patch
arm64-mm-hvo-support-bbm-of-vmemmap-pgtable-safely.patch
arm64-mm-re-enable-optimize_hugetlb_vmemmap.patch
