4.14.109-rt58-rc1 stable review patch. If anyone has any objections, please let me know.
------------------ From: Sebastian Andrzej Siewior <[email protected]> [ Upstream commit 4a1bf9e54a013d55ab156cb462c68054cb52ee2d ] The rwlock is spinning while acquiring a lock. Therefore it must become a sleeping lock on RT and preserve its task state while sleeping and waiting for the lock to become available. Reported-by: Joe Korty <[email protected]> Cc: [email protected] Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Tom Zanussi <[email protected]> --- kernel/locking/rwlock-rt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/locking/rwlock-rt.c b/kernel/locking/rwlock-rt.c index f2e155b2c4a8..c3b91205161c 100644 --- a/kernel/locking/rwlock-rt.c +++ b/kernel/locking/rwlock-rt.c @@ -128,7 +128,7 @@ void __sched __read_rt_lock(struct rt_rw_lock *lock) * That would put Reader1 behind the writer waiting on * Reader2 to call read_unlock() which might be unbound. */ - rt_mutex_init_waiter(&waiter, false); + rt_mutex_init_waiter(&waiter, true); rt_spin_lock_slowlock_locked(m, &waiter, flags); /* * The slowlock() above is guaranteed to return with the rtmutex is -- 2.14.1
