The patch titled
Subject: arm64: hugetlb: enable __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
has been added to the -mm mm-unstable branch. Its filename is
arm64-hugetlb-enable-__have_arch_flush_hugetlb_tlb_range.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-hugetlb-enable-__have_arch_flush_hugetlb_tlb_range.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: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: arm64: hugetlb: enable __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
Date: Wed, 2 Aug 2023 09:27:31 +0800
It is better to use huge page size instead of PAGE_SIZE for stride when
flush hugepage, which reduces the loop in __flush_tlb_range().
Let's support arch's flush_hugetlb_tlb_range(), which is used in
hugetlb_unshare_all_pmds(), move_hugetlb_page_tables() and
hugetlb_change_protection() for now.
Note, for hugepages based on contiguous bit, it has to be invalidated
individually since the contiguous PTE bit is just a hint, the hardware may
or may not take it into account.
Link: https://lkml.kernel.org/r/20230802012731.62512-1-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Barry Song <21cnbao@xxxxxxxxx>
Cc: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mina Almasry <almasrymina@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/hugetlb.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/arch/arm64/include/asm/hugetlb.h~arm64-hugetlb-enable-__have_arch_flush_hugetlb_tlb_range
+++ a/arch/arm64/include/asm/hugetlb.h
@@ -60,4 +60,19 @@ extern void huge_ptep_modify_prot_commit
#include <asm-generic/hugetlb.h>
+#define __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
+static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma,
+ unsigned long start,
+ unsigned long end)
+{
+ unsigned long stride = huge_page_size(hstate_vma(vma));
+
+ if (stride == PMD_SIZE)
+ __flush_tlb_range(vma, start, end, stride, false, 2);
+ else if (stride == PUD_SIZE)
+ __flush_tlb_range(vma, start, end, stride, false, 1);
+ else
+ __flush_tlb_range(vma, start, end, PAGE_SIZE, false, 0);
+}
+
#endif /* __ASM_HUGETLB_H */
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-remove-arguments-of-show_mem.patch
mm-make-show_free_areas-static.patch
mm-factor-out-vma-stack-and-heap-checks.patch
drm-amdkfd-use-vma_is_initial_stack-and-vma_is_initial_heap.patch
selinux-use-vma_is_initial_stack-and-vma_is_initial_heap.patch
perf-core-use-vma_is_initial_stack-and-vma_is_initial_heap.patch
arm64-hugetlb-enable-__have_arch_flush_hugetlb_tlb_range.patch
