From: Andrew Morton <akpm@linux-foundation.org>
To: tiberiu.georgescu@nutanix.com, sj@kernel.org,
shy828301@gmail.com, peterx@redhat.com, linmiaohe@huawei.com,
ivan.teterevkov@nutanix.com, florian.schmidt@nutanix.com,
david@redhat.com, corbet@lwn.net, ccross@google.com,
axelrasmussen@google.com, apopple@nvidia.com,
aarcange@redhat.com, yun.zhou@windriver.com,
akpm@linux-foundation.org, patches@lists.linux.dev,
linux-mm@kvack.org, mm-commits@vger.kernel.org,
torvalds@linux-foundation.org, akpm@linux-foundation.org
Subject: [patch 7/8] proc: fix documentation and description of pagemap
Date: Fri, 04 Mar 2022 20:29:07 -0800 [thread overview]
Message-ID: <20220305042908.4BD80C36AE3@smtp.kernel.org> (raw)
In-Reply-To: <20220304202822.d47f8084928321c83070d7d7@linux-foundation.org>
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
_
next prev parent reply other threads:[~2022-03-05 4:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-05 4:28 incoming Andrew Morton
2022-03-05 4:28 ` [patch 1/8] selftests/vm: cleanup hugetlb file after mremap test Andrew Morton
2022-03-05 4:28 ` [patch 2/8] mm: refactor vm_area_struct::anon_vma_name usage code Andrew Morton
2022-03-05 4:28 ` [patch 3/8] mm: prevent vm_area_struct::anon_name refcount saturation Andrew Morton
2022-03-05 19:03 ` Linus Torvalds
2022-03-05 4:28 ` [patch 4/8] mm: fix use-after-free when anon vma name is used after vma is freed Andrew Morton
2022-03-05 4:29 ` [patch 5/8] memfd: fix F_SEAL_WRITE after shmem huge page allocated Andrew Morton
2022-03-05 4:29 ` [patch 6/8] kselftest/vm: fix tests build with old libc Andrew Morton
2022-03-05 4:29 ` Andrew Morton [this message]
2022-03-05 4:29 ` [patch 8/8] configs/debug: set CONFIG_DEBUG_INFO=y properly Andrew Morton
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