The patch titled
Subject: mm-uffd-uffd_feature_wp_unpopulated-fix
has been added to the -mm mm-unstable branch. Its filename is
mm-uffd-uffd_feature_wp_unpopulated-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-uffd-uffd_feature_wp_unpopulated-fix.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: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm-uffd-uffd_feature_wp_unpopulated-fix
Date: Tue, 21 Mar 2023 16:09:26 -0400
Two comment changes suggested by David, and also a oneliner fix to
khugepaged (to bail out anon thp collapsing when seeing pte markers).
Link: https://lkml.kernel.org/r/ZB2/8jPhD3fpx5U8@x1n
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
Cc: Nadav Amit <nadav.amit@xxxxxxxxx>
Cc: Paul Gofman <pgofman@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/mm/userfaultfd.rst | 2 +-
mm/khugepaged.c | 2 +-
mm/mprotect.c | 4 ++--
3 files changed, 4 insertions(+), 4 deletions(-)
--- a/Documentation/admin-guide/mm/userfaultfd.rst~mm-uffd-uffd_feature_wp_unpopulated-fix
+++ a/Documentation/admin-guide/mm/userfaultfd.rst
@@ -226,7 +226,7 @@ For anonymous memory, ``ioctl(UFFDIO_WRI
(e.g. when pages are missing and not populated). For file-backed memories
like shmem and hugetlbfs, none ptes will be write protected just like a
present pte. In other words, there will be a userfaultfd write fault
-message generated when writting to a missing page on file typed memories,
+message generated when writing to a missing page on file typed memories,
as long as the page range was write-protected before. Such a message will
not be generated on anonymous memories by default.
--- a/mm/khugepaged.c~mm-uffd-uffd_feature_wp_unpopulated-fix
+++ a/mm/khugepaged.c
@@ -1282,7 +1282,7 @@ static int hpage_collapse_scan_pmd(struc
* enabled swap entries. Please see
* comment below for pte_uffd_wp().
*/
- if (pte_swp_uffd_wp(pteval)) {
+ if (pte_swp_uffd_wp_any(pteval)) {
result = SCAN_PTE_UFFD_WP;
goto out_unmap;
}
--- a/mm/mprotect.c~mm-uffd-uffd_feature_wp_unpopulated-fix
+++ a/mm/mprotect.c
@@ -329,8 +329,8 @@ static inline int pmd_none_or_clear_bad_
}
/*
- * Return true if we want to split huge thps in change protection
- * procedure, false otherwise.
+ * Return true if we want to split THPs into PTE mappings in change
+ * protection procedure, false otherwise.
*/
static inline bool
pgtable_split_needed(struct vm_area_struct *vma, unsigned long cp_flags)
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-hugetlb-fix-uffd-wr-protection-for-cow-optimization-path.patch
mm-hugetlb-fix-uffd-wr-protection-for-cow-optimization-path-v2.patch
mm-khugepaged-alloc_charge_hpage-take-care-of-mem-charge-errors.patch
mm-khugepaged-cleanup-memcg-uncharge-for-failure-path.patch
mm-uffd-uffd_feature_wp_unpopulated.patch
mm-uffd-uffd_feature_wp_unpopulated-fix.patch
selftests-mm-smoke-test-uffd_feature_wp_unpopulated.patch
mm-thp-rename-transparent_hugepage_never_dax-to-_unsupported.patch
mm-thp-rename-transparent_hugepage_never_dax-to-_unsupported-fix.patch
