| Message ID | 20220301044538.3042713-1-yun.zhou@windriver.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] proc: fix documentation and description of pagemap | expand |
On Tue, Mar 01, 2022 at 12:45:38PM +0800, Yun Zhou wrote: > Since bit 57 was exported for uffd-wp write-protected(commit fb8e37f35a2f), > fixing it can reduce some unnecessary confusion. > > Signed-off-by: Yun Zhou <yun.zhou@windriver.com> Reviewed-by: Peter Xu <peterx@redhat.com> Thanks,
diff --git a/Documentation/admin-guide/mm/pagemap.rst b/Documentation/admin-guide/mm/pagemap.rst index bfc28704856c..6e2e416af783 100644 --- a/Documentation/admin-guide/mm/pagemap.rst +++ b/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 diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 78125ef20255..2f110089d50e 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1596,7 +1596,8 @@ static const struct mm_walk_ops pagemap_ops = { * 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
Since bit 57 was exported for uffd-wp write-protected(commit fb8e37f35a2f), fixing it can reduce some unnecessary confusion. Signed-off-by: Yun Zhou <yun.zhou@windriver.com> --- Documentation/admin-guide/mm/pagemap.rst | 2 +- fs/proc/task_mmu.c | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-)