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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2018-12-11 12:12:38 +0100
committerPaul E. McKenney <paulmck@linux.ibm.com>2019-01-25 15:36:42 -0800
commite81baf4cb19a9b428ba477fd0423f81672a58817 (patch)
treefd518df0bf3f31968c4541ff488f0c727cc1b2b2 /include/linux/srcu.h
parentc8ca1aa774b20f182733d1661f3b6aa3105338e7 (diff)
srcu: Remove srcu_queue_delayed_work_on()
srcu_queue_delayed_work_on() disables preemption (and therefore CPU hotplug in RCU's case) and then checks based on its own accounting if a CPU is online. If the CPU is online it uses queue_delayed_work_on() otherwise it fallbacks to queue_delayed_work(). The problem here is that queue_work() on -RT does not work with disabled preemption. queue_work_on() works also on an offlined CPU. queue_delayed_work_on() has the problem that it is possible to program a timer on an offlined CPU. This timer will fire once the CPU is online again. But until then, the timer remains programmed and nothing will happen. Add a local timer which will fire (as requested per delay) on the local CPU and then enqueue the work on the specific CPU. RCUtorture testing with SRCU-P for 24h showed no problems. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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