]> www.infradead.org Git - users/jedix/linux-maple.git/commit
mm/hugetlb: take care of UFFDIO_COPY_MODE_WP
authorPeter Xu <peterx@redhat.com>
Thu, 14 Apr 2022 19:16:50 +0000 (12:16 -0700)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Thu, 14 Apr 2022 21:49:51 +0000 (17:49 -0400)
commite0535d791d9bbae2b3c61ef442afc159c4c5f622
treeb9d3460ec3a1608bd3b5f43535d0625fc0d1b4d7
parent0d945e05fc45ce7dd8d2189e2a31a528503d0bc9
mm/hugetlb: take care of UFFDIO_COPY_MODE_WP

Pass the wp_copy variable into hugetlb_mcopy_atomic_pte() thoughout the
stack.  Apply the UFFD_WP bit if UFFDIO_COPY_MODE_WP is with UFFDIO_COPY.

Hugetlb pages are only managed by hugetlbfs, so we're safe even without
setting dirty bit in the huge pte if the page is installed as read-only.
However we'd better still keep the dirty bit set for a read-only
UFFDIO_COPY pte (when UFFDIO_COPY_MODE_WP bit is set), not only to match
what we do with shmem, but also because the page does contain dirty data
that the kernel just copied from the userspace.

Link: https://lkml.kernel.org/r/20220405014904.14643-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: "Kirill A . Shutemov" <kirill@shutemov.name>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
include/linux/hugetlb.h
mm/hugetlb.c
mm/userfaultfd.c