| Message ID | 20121204085504.25919.38913.stgit@srivatsabhat.in.ibm.com (mailing list archive) |
|---|---|
| State | RFC, archived |
| Headers | show |
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index ef6ada4..c1a5d93 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1091,11 +1091,11 @@ void kick_process(struct task_struct *p) { int cpu; - preempt_disable(); + get_online_cpus_stable_atomic(); cpu = task_cpu(p); if ((cpu != smp_processor_id()) && task_curr(p)) smp_send_reschedule(cpu); - preempt_enable(); + put_online_cpus_stable_atomic(); } EXPORT_SYMBOL_GPL(kick_process); #endif /* CONFIG_SMP */
With stop_machine() gone from the CPU offline path, we can't depend on preempt_disable() to prevent CPUs from going offline from under us. Use the get/put_online_cpus_stable_atomic() APIs to prevent CPUs from going offline, while invoking from atomic context. Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> --- kernel/sched/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html