Messages in this thread | | | From | Dominik Dingel <> | Subject | [PATCH v2 0/2] Allow gmap fault to retry | Date | Thu, 26 Nov 2015 18:27:00 +0100 |
| |
Hello,
during Jasons work with postcopy migration support for s390 a problem regarding gmap faults was discovered.
The gmap code will call fixup_userfault which will end up always in handle_mm_fault. Till now we never cared about retries, but as the userfaultfd code kind of relies on it, this needs some fix.
Thanks, Dominik
v1 -> v2: - Instead of passing the VM_FAULT_RETRY from fixup_user_fault we do retries within fixup_user_fault, like get_user_pages_locked do. - gmap code will now take retry if fixup_user_fault drops the lock
Dominik Dingel (2): mm: bring in additional flag for fixup_user_fault to signal unlock s390/mm: enable fixup_user_fault retrying
arch/s390/mm/pgtable.c | 31 ++++++++++++++++++++++++++++--- include/linux/mm.h | 5 +++-- kernel/futex.c | 2 +- mm/gup.c | 25 +++++++++++++++++++++---- 4 files changed, 53 insertions(+), 10 deletions(-)
-- 2.3.9
| |