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From:   Peter Xu <peterx@redhat.com>
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc:     Mike Kravetz <mike.kravetz@oracle.com>, peterx@redhat.com,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Axel Rasmussen <axelrasmussen@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Hugh Dickins <hughd@google.com>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jerome Glisse <jglisse@redhat.com>
Subject: [PATCH 0/6] mm/uffd: Misc fix for uffd-wp and one more test
Date:   Wed, 28 Apr 2021 18:50:24 -0400
Message-Id: <20210428225030.9708-1-peterx@redhat.com>
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This series is based on (mostly) v5.12-rc8-mmots-2021-04-21-23-08.  It trie=
s to=0D
fix some corner case bugs for uffd-wp on either thp or fork().  Then it=0D
introduced a new test with pagemap/pageout.=0D
=0D
Patch layout:=0D
=0D
Patch 1:    cleanup for THP, it'll slightly simplify the follow up patches=
=0D
Patch 2-4:  misc fixes for uffd-wp here and there; please refer to each pat=
ch=0D
Patch 5:    add pagemap support for uffd-wp=0D
Patch 6:    add pagemap/pageout test for uffd-wp=0D
=0D
The last test introduced can also verify some of the fixes in previous patc=
hes,=0D
as the test will fail without the fixes.  However it's not easy to verify a=
ll=0D
the changes in patch 2-4, but hopefully they can still be properly reviewed=
.=0D
=0D
Note that if considering the ongoing uffd-wp shmem & hugetlbfs work, patch =
5=0D
will be incomplete as it's missing e.g. hugetlbfs part or the special swap =
pte=0D
detection.  However that's not needed in this series, and since that series=
 is=0D
still during review, this series does not depend on that one (the last test=
=0D
only runs with anonymous memory, not file-backed).  So this series can be=0D
merged even before that series.=0D
=0D
Please review, thanks.=0D
=0D
Peter Xu (6):=0D
  mm/thp: Simplify copying of huge zero page pmd when fork=0D
  mm/userfaultfd: Fix uffd-wp special cases for fork()=0D
  mm/userfaultfd: Fix a few thp pmd missing uffd-wp bit=0D
  mm/userfaultfd: Fail uffd-wp registeration if not supported=0D
  mm/pagemap: Export uffd-wp protection information=0D
  userfaultfd/selftests: Add pagemap uffd-wp test=0D
=0D
 Documentation/admin-guide/mm/pagemap.rst |   2 +=0D
 fs/proc/task_mmu.c                       |   9 ++=0D
 fs/userfaultfd.c                         |   9 +-=0D
 include/linux/huge_mm.h                  |   2 +-=0D
 include/linux/swapops.h                  |   2 +=0D
 mm/huge_memory.c                         |  36 +++---=0D
 mm/memory.c                              |  25 ++--=0D
 tools/testing/selftests/vm/userfaultfd.c | 154 +++++++++++++++++++++++=0D
 8 files changed, 206 insertions(+), 33 deletions(-)=0D
=0D
-- =0D
2.26.2=0D
=0D