The patch titled
Subject: mm/hugetlb: introduce huge pte version of uffd-wp helpers
has been added to the -mm tree. Its filename is
mm-hugetlb-introduce-huge-pte-version-of-uffd-wp-helpers.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-introduce-huge-pte-version-of-uffd-wp-helpers.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-introduce-huge-pte-version-of-uffd-wp-helpers.patch
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------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/hugetlb: introduce huge pte version of uffd-wp helpers
They will be used in the follow up patches to either check/set/clear
uffd-wp bit of a huge pte.
So far it reuses all the small pte helpers. Archs can overwrite these
versions when necessary (with __HAVE_ARCH_HUGE_PTE_UFFD_WP* macros) in the
future.
Link: https://lkml.kernel.org/r/20220405014858.14531-1-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Nadav Amit <nadav.amit@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/include/asm/hugetlb.h | 15 +++++++++++++++
include/asm-generic/hugetlb.h | 15 +++++++++++++++
2 files changed, 30 insertions(+)
--- a/arch/s390/include/asm/hugetlb.h~mm-hugetlb-introduce-huge-pte-version-of-uffd-wp-helpers
+++ a/arch/s390/include/asm/hugetlb.h
@@ -115,6 +115,21 @@ static inline pte_t huge_pte_modify(pte_
return pte_modify(pte, newprot);
}
+static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
+{
+ return pte;
+}
+
+static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
+{
+ return pte;
+}
+
+static inline int huge_pte_uffd_wp(pte_t pte)
+{
+ return 0;
+}
+
static inline bool gigantic_page_runtime_supported(void)
{
return true;
--- a/include/asm-generic/hugetlb.h~mm-hugetlb-introduce-huge-pte-version-of-uffd-wp-helpers
+++ a/include/asm-generic/hugetlb.h
@@ -35,6 +35,21 @@ static inline pte_t huge_pte_modify(pte_
return pte_modify(pte, newprot);
}
+static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
+{
+ return pte_mkuffd_wp(pte);
+}
+
+static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
+{
+ return pte_clear_uffd_wp(pte);
+}
+
+static inline int huge_pte_uffd_wp(pte_t pte)
+{
+ return pte_uffd_wp(pte);
+}
+
#ifndef __HAVE_ARCH_HUGE_PTE_CLEAR
static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, unsigned long sz)
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-introduce-pte_marker-swap-entry.patch
mm-teach-core-mm-about-pte-markers.patch
mm-check-against-orig_pte-for-finish_fault.patch
mm-uffd-pte_marker_uffd_wp.patch
mm-shmem-take-care-of-uffdio_copy_mode_wp.patch
mm-shmem-handle-uffd-wp-special-pte-in-page-fault-handler.patch
mm-shmem-persist-uffd-wp-bit-across-zapping-for-file-backed.patch
mm-shmem-allow-uffd-wr-protect-none-pte-for-file-backed-mem.patch
mm-shmem-allows-file-back-mem-to-be-uffd-wr-protected-on-thps.patch
mm-shmem-handle-uffd-wp-during-fork.patch
mm-hugetlb-introduce-huge-pte-version-of-uffd-wp-helpers.patch
mm-hugetlb-hook-page-faults-for-uffd-write-protection.patch
mm-hugetlb-take-care-of-uffdio_copy_mode_wp.patch
mm-hugetlb-handle-uffdio_writeprotect.patch
mm-hugetlb-handle-pte-markers-in-page-faults.patch
mm-hugetlb-allow-uffd-wr-protect-none-ptes.patch
mm-hugetlb-only-drop-uffd-wp-special-pte-if-required.patch
mm-hugetlb-handle-uffd-wp-during-fork.patch
mm-khugepaged-dont-recycle-vma-pgtable-if-uffd-wp-registered.patch
mm-pagemap-recognize-uffd-wp-bit-for-shmem-hugetlbfs.patch
mm-uffd-enable-write-protection-for-shmem-hugetlbfs.patch
mm-enable-pte-markers-by-default.patch
selftests-uffd-enable-uffd-wp-for-shmem-hugetlbfs.patch
