On Thu, 18 Oct 2018 17:41:01 +0200 Christoph Hellwig <hch@xxxxxx> wrote: > userfaultfd contains howe-grown locking of the waitqueue lock, > and does not disable interrupts. This relies on the fact that > no one else takes it from interrupt context and violates an > invariat of the normal waitqueue locking scheme. With aio poll > it is easy to trigger other locks that disable interrupts (or > are called from interrupt context). So... this is needed in 4.19.x but not earlier? Or something else?
