| 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 |
| _ |
