From 64eaf974218d576812919c8b1a8d87ded4e695d9 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Wed, 15 Apr 2015 12:45:41 -0700 Subject: [PATCH] cpu: Handle smpboot_unpark_threads() uniformly Commit 00df35f99191 (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 --- kernel/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index 94bbe4695232..260eb7db281e 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -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;