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| author |   Jann Horn <jannh@google.com> | 2020-10-15 20:12:57 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:21 -0700 |
| commit | 7f3bfab52cab96c510fd60dd757a32db7bc52d3c (patch) | |
| tree | 56a0c274000eac4b997a2fbc1d9bc044270c3c54 /mm/mmap.c | |
| parent | binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot (diff) | |
| download | linux-dev-7f3bfab52cab96c510fd60dd757a32db7bc52d3c.tar.xz linux-dev-7f3bfab52cab96c510fd60dd757a32db7bc52d3c.zip | |
mm/gup: take mmap_lock in get_dump_page()
Properly take the mmap_lock before calling into the GUP code from
get_dump_page(); and play nice, allowing the GUP code to drop the
mmap_lock if it has to sleep.
As Linus pointed out, we don't actually need the VMA because
__get_user_pages() will flush the dcache for us if necessary.
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Link: http://lkml.kernel.org/r/20200827114932.3572699-7-jannh@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
0 files changed, 0 insertions, 0 deletions