The patch titled
Subject: arm64/mm: pte_clear(): new layer to manage contig bit
has been added to the -mm mm-unstable branch. Its filename is
arm64-mm-pte_clear-new-layer-to-manage-contig-bit.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-mm-pte_clear-new-layer-to-manage-contig-bit.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: Ryan Roberts <ryan.roberts@xxxxxxx>
Subject: arm64/mm: pte_clear(): new layer to manage contig bit
Date: Mon, 18 Dec 2023 10:50:50 +0000
Create a new layer for the in-table PTE manipulation APIs. For now, The
existing API is prefixed with double underscore to become the arch-private
API and the public API is just a simple wrapper that calls the private
API.
The public API implementation will subsequently be used to transparently
manipulate the contiguous bit where appropriate. But since there are
already some contig-aware users (e.g. hugetlb, kernel mapper), we must
first ensure those users use the private API directly so that the future
contig-bit manipulations in the public API do not interfere with those
existing uses.
Link: https://lkml.kernel.org/r/20231218105100.172635-7-ryan.roberts@xxxxxxx
Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
Tested-by: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Barry Song <21cnbao@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Oliver Upton <oliver.upton@xxxxxxxxx>
Cc: Suzuki Poulouse <suzuki.poulose@xxxxxxx>
Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Zenghui Yu <yuzenghui@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/pgtable.h | 3 ++-
arch/arm64/mm/fixmap.c | 2 +-
arch/arm64/mm/hugetlbpage.c | 2 +-
arch/arm64/mm/mmu.c | 2 +-
4 files changed, 5 insertions(+), 4 deletions(-)
--- a/arch/arm64/include/asm/pgtable.h~arm64-mm-pte_clear-new-layer-to-manage-contig-bit
+++ a/arch/arm64/include/asm/pgtable.h
@@ -93,7 +93,7 @@ static inline pteval_t __phys_to_pte_val
__pte(__phys_to_pte_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pte_none(pte) (!pte_val(pte))
-#define pte_clear(mm, addr, ptep) \
+#define __pte_clear(mm, addr, ptep) \
__set_pte(ptep, __pte(0))
#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
@@ -1121,6 +1121,7 @@ extern void ptep_modify_prot_commit(stru
#define set_pte __set_pte
#define set_ptes __set_ptes
+#define pte_clear __pte_clear
#endif /* !__ASSEMBLY__ */
--- a/arch/arm64/mm/fixmap.c~arm64-mm-pte_clear-new-layer-to-manage-contig-bit
+++ a/arch/arm64/mm/fixmap.c
@@ -123,7 +123,7 @@ void __set_fixmap(enum fixed_addresses i
if (pgprot_val(flags)) {
__set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags));
} else {
- pte_clear(&init_mm, addr, ptep);
+ __pte_clear(&init_mm, addr, ptep);
flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
}
}
--- a/arch/arm64/mm/hugetlbpage.c~arm64-mm-pte_clear-new-layer-to-manage-contig-bit
+++ a/arch/arm64/mm/hugetlbpage.c
@@ -400,7 +400,7 @@ void huge_pte_clear(struct mm_struct *mm
ncontig = num_contig_ptes(sz, &pgsize);
for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
- pte_clear(mm, addr, ptep);
+ __pte_clear(mm, addr, ptep);
}
pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
--- a/arch/arm64/mm/mmu.c~arm64-mm-pte_clear-new-layer-to-manage-contig-bit
+++ a/arch/arm64/mm/mmu.c
@@ -859,7 +859,7 @@ static void unmap_hotplug_pte_range(pmd_
continue;
WARN_ON(!pte_present(pte));
- pte_clear(&init_mm, addr, ptep);
+ __pte_clear(&init_mm, addr, ptep);
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
if (free_mapped)
free_hotplug_page_range(pte_page(pte),
_
Patches currently in -mm which might be from ryan.roberts@xxxxxxx are
mm-allow-deferred-splitting-of-arbitrary-anon-large-folios.patch
mm-non-pmd-mappable-large-folios-for-folio_add_new_anon_rmap.patch
mm-thp-introduce-multi-size-thp-sysfs-interface.patch
mm-thp-introduce-multi-size-thp-sysfs-interface-fix.patch
mm-thp-support-allocation-of-anonymous-multi-size-thp.patch
mm-thp-support-allocation-of-anonymous-multi-size-thp-fix.patch
selftests-mm-kugepaged-restore-thp-settings-at-exit.patch
selftests-mm-factor-out-thp-settings-management.patch
selftests-mm-support-multi-size-thp-interface-in-thp_settings.patch
selftests-mm-khugepaged-enlighten-for-multi-size-thp.patch
selftests-mm-cow-generalize-do_run_with_thp-helper.patch
selftests-mm-cow-add-tests-for-anonymous-multi-size-thp.patch
mm-thp-batch-collapse-pmd-with-set_ptes.patch
mm-batch-copy-pte-ranges-during-fork.patch
mm-batch-clear-pte-ranges-during-zap_pte_range.patch
arm64-mm-set_pte-new-layer-to-manage-contig-bit.patch
arm64-mm-set_ptes-set_pte_at-new-layer-to-manage-contig-bit.patch
arm64-mm-pte_clear-new-layer-to-manage-contig-bit.patch
arm64-mm-ptep_get_and_clear-new-layer-to-manage-contig-bit.patch
arm64-mm-ptep_test_and_clear_young-new-layer-to-manage-contig-bit.patch
arm64-mm-ptep_clear_flush_young-new-layer-to-manage-contig-bit.patch
arm64-mm-ptep_set_wrprotect-new-layer-to-manage-contig-bit.patch
arm64-mm-ptep_set_access_flags-new-layer-to-manage-contig-bit.patch
arm64-mm-ptep_get-new-layer-to-manage-contig-bit.patch
arm64-mm-split-__flush_tlb_range-to-elide-trailing-dsb.patch
arm64-mm-wire-up-pte_cont-for-user-mappings.patch
arm64-mm-implement-new-helpers-to-optimize-fork.patch
arm64-mm-implement-clear_ptes-to-optimize-exit-munmap-dontneed.patch
selftests-mm-log-run_vmtestssh-results-in-tap-format.patch
