+ proc-fix-documentation-and-description-of-pagemap.patch added to -mm tree

+ proc-fix-documentation-and-description-of-pagemap.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: proc: fix documentation and description of pagemap
has been added to the -mm tree.  Its filename is
     proc-fix-documentation-and-description-of-pagemap.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/proc-fix-documentation-and-description-of-pagemap.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/proc-fix-documentation-and-description-of-pagemap.patch

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   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 ***

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------------------------------------------------------
From: Yun Zhou <yun.zhou@windriver.com>
Subject: proc: fix documentation and description of pagemap

Since bit 57 was exported for uffd-wp write-protected(commit
fb8e37f35a2f), fixing it can reduce some unnecessary confusion.

Link: https://lkml.kernel.org/r/20220301044538.3042713-1-yun.zhou@windriver.com
Fixes: fb8e37f35a2fe1 ("mm/pagemap: export uffd-wp protection information")
Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Tiberiu A Georgescu <tiberiu.georgescu@nutanix.com>
Cc: Florian Schmidt <florian.schmidt@nutanix.com>
Cc: Ivan Teterevkov <ivan.teterevkov@nutanix.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Colin Cross <ccross@google.com>
Cc: Alistair Popple <apopple@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/mm/pagemap.rst |    2 +-
 fs/proc/task_mmu.c                       |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/Documentation/admin-guide/mm/pagemap.rst~proc-fix-documentation-and-description-of-pagemap
+++ a/Documentation/admin-guide/mm/pagemap.rst
@@ -23,7 +23,7 @@ There are four components to pagemap:
     * Bit  56    page exclusively mapped (since 4.2)
     * Bit  57    pte is uffd-wp write-protected (since 5.13) (see
       :ref:`Documentation/admin-guide/mm/userfaultfd.rst <userfaultfd>`)
-    * Bits 57-60 zero
+    * Bits 58-60 zero
     * Bit  61    page is file-page or shared-anon (since 3.5)
     * Bit  62    page swapped
     * Bit  63    page present
--- a/fs/proc/task_mmu.c~proc-fix-documentation-and-description-of-pagemap
+++ a/fs/proc/task_mmu.c
@@ -1597,7 +1597,8 @@ static const struct mm_walk_ops pagemap_
  * Bits 5-54  swap offset if swapped
  * Bit  55    pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst)
  * Bit  56    page exclusively mapped
- * Bits 57-60 zero
+ * Bit  57    pte is uffd-wp write-protected
+ * Bits 58-60 zero
  * Bit  61    page is file-page or shared-anon
  * Bit  62    page swapped
  * Bit  63    page present
_

Patches currently in -mm which might be from yun.zhou@windriver.com are

proc-fix-documentation-and-description-of-pagemap.patch