On Wed, Jun 28, 2023 at 10:32 AM Peter Xu <peterx@xxxxxxxxxx> wrote: > > On Wed, Jun 28, 2023 at 10:25:29AM -0700, Suren Baghdasaryan wrote: > > Enable handle_userfault to operate under VMA lock by releasing VMA lock > > instead of mmap_lock and retrying. Note that FAULT_FLAG_RETRY_NOWAIT > > should never be used when handling faults under per-VMA lock protection > > because that would break the assumption that lock is dropped on retry. > > > > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> > > Maybe the sanitize_fault_flags() changes suite more in patch 3, but not a > big deal I guess. IIUC FAULT_FLAG_RETRY_NOWAIT comes into play in this patchset only in the context of uffds, therefore that check seems to be needed when we enable per-VMA lock uffd support, which is this patch. Does that make sense? > > Acked-by: Peter Xu <peterx@xxxxxxxxxx> Thanks! > > Thanks! > > -- > Peter Xu >
