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io_uring: use private workqueue for exit work
BugLink: https://bugs.launchpad.net/bugs/2065400 commit 73eaa2b583493b680c6f426531d6736c39643bfb upstream. Rather than use the system unbound event workqueue, use an io_uring specific one. This avoids dependencies with the tty, which also uses the system_unbound_wq, and issues flushes of said workqueue from inside its poll handling. Cc: stable@vger.kernel.org Reported-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com> Tested-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com> Tested-by: Iskren Chernev <me@iskren.info> Link: axboe/liburing#1113 Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com> Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
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