On Tue, 27 Apr 2021, Axel Rasmussen wrote:
This patch allows shmem-backed VMAs to be registered for minor faults. Minor faults are appropriately relayed to userspace in the fault path, for VMAs with the relevant flag.
This commit doesn't hook up the UFFDIO_CONTINUE ioctl for shmem-backed minor faults, though, so userspace doesn't yet have a way to resolve such faults.
Because of this, we also don't yet advertise this as a supported feature. That will be done in a separate commit when the feature is fully implemented.
Acked-by: Peter Xu peterx@redhat.com Signed-off-by: Axel Rasmussen axelrasmussen@google.com
Acked-by: Hugh Dickins hughd@google.com
fs/userfaultfd.c | 3 +-- mm/memory.c | 8 +++++--- mm/shmem.c | 12 +++++++++++- 3 files changed, 17 insertions(+), 6 deletions(-)