Messages in this thread Patch in this message | | | From | Yun Zhou <> | Subject | [v2][PATCH] proc: fix documentation and description of pagemap | Date | Tue, 1 Mar 2022 12:45:38 +0800 |
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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(-)
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 -- 2.27.0
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