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| author | Andrea Arcangeli | 2017-09-09 01:12:42 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2017-09-09 03:26:47 +0200 |
| commit | 656710a60e3693911bee3a355d2f2bbae3faba33 (patch) | |
| tree | dd55fb4c43f3cf65c50d0795a001370429b4d6e0 /mm/memory.c | |
| parent | mm: remove useless vma parameter to offset_il_node (diff) | |
| download | kernel-qcow2-linux-656710a60e3693911bee3a355d2f2bbae3faba33.tar.gz kernel-qcow2-linux-656710a60e3693911bee3a355d2f2bbae3faba33.tar.xz kernel-qcow2-linux-656710a60e3693911bee3a355d2f2bbae3faba33.zip | |
userfaultfd: non-cooperative: closing the uffd without triggering SIGBUS
This is an enhancement to avoid a non cooperative userfaultfd manager
having to unregister all regions before it can close the uffd after all
userfaultfd activity completed.
The UFFDIO_UNREGISTER would serialize against the handle_userfault by
taking the mmap_sem for writing, but we can simply repeat the page fault
if we detect the uffd was closed and so the regular page fault paths
should takeover.
Link: http://lkml.kernel.org/r/20170823181227.19926-1-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
0 files changed, 0 insertions, 0 deletions