+ mm-uffd-pte_marker_uffd_wp-fix.patch added to -mm tree

+ mm-uffd-pte_marker_uffd_wp-fix.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: fixup! mm/uffd: PTE_MARKER_UFFD_WP
has been added to the -mm tree.  Its filename is
     mm-uffd-pte_marker_uffd_wp-fix.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-uffd-pte_marker_uffd_wp-fix.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-uffd-pte_marker_uffd_wp-fix.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: fixup! mm/uffd: PTE_MARKER_UFFD_WP

Link: https://lkml.kernel.org/r/YkzKiM8tI4+qOfXF@xz-m1.local
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/userfaultfd_k.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/linux/userfaultfd_k.h~mm-uffd-pte_marker_uffd_wp-fix
+++ a/include/linux/userfaultfd_k.h
@@ -240,8 +240,12 @@ static inline void userfaultfd_unmap_com
 
 static inline bool pte_marker_entry_uffd_wp(swp_entry_t entry)
 {
+#ifdef CONFIG_PTE_MARKER_UFFD_WP
 	return is_pte_marker_entry(entry) &&
 	    (pte_marker_get(entry) & PTE_MARKER_UFFD_WP);
+#else
+	return false;
+#endif
 }
 
 static inline bool pte_marker_uffd_wp(pte_t pte)
_

Patches currently in -mm which might be from peterx@redhat.com 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-uffd-pte_marker_uffd_wp-fix.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