Commit 64eaf974 authored Apr 15, 2015 by Paul E. McKenney

cpu: Handle smpboot_unpark_threads() uniformly

Commit 00df35f9 (cpu: Defer smpboot kthread unparking until CPU known
to scheduler) put the online path's call to smpboot_unpark_threads()
into a CPU-hotplug notifier. This commit places the offline-failure
paths call into the same notifier for the sake of uniformity.

Note that it is not currently possible to place the offline path's call to
smpboot_park_threads() into an existing notifier because the CPU_DYING
notifiers run in a restricted environment, and the CPU_UP_PREPARE
notifiers run too soon.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent a738eec6

kernel/cpu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -398,7 +398,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
		err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
		if (err) {
		/* CPU didn't die: tell everyone. Can't complain. */
		smpboot_unpark_threads(cpu);
		cpu_notify_nofail(CPU_DOWN_FAILED \| mod, hcpu);
		goto out_release;
		}
		@@ -463,6 +462,7 @@ static int smpboot_thread_call(struct notifier_block *nfb,

		switch (action & ~CPU_TASKS_FROZEN) {

		case CPU_DOWN_FAILED:
		case CPU_ONLINE:
		smpboot_unpark_threads(cpu);
		break;