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Oleg Nesterov authored
There is no agreed-upon definition of spin_unlock_wait()'s semantics, and it appears that all callers could do just as well with a lock/unlock pair. This commit therefore replaces the spin_unlock_wait() call in task_work_run() with a spin_lock_irq() and a spin_unlock_irq() aruond the cmpxchg() dequeue loop. This should be safe from a performance perspective because ->pi_lock is local to the task and because calls to the other side of the race, task_work_cancel(), should be rare. Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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