sched: Fix incorrect sanity check

We moved to migrate on wakeup, which means that sleeping tasks could
still be present on offline cpus. Amend the check to only test running
tasks.

Reported-by: Heiko Carstens <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 1c8ddd6ee9402fdf2f6853c6142f3a8d0cb57da6..08e54e7beaed19f87766053349ae5b3c3f333a18 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -151,7 +151,7 @@ static inline void check_for_tasks(int cpu)
 
        write_lock_irq(&tasklist_lock);
        for_each_process(p) {
-               if (task_cpu(p) == cpu &&
+               if (task_cpu(p) == cpu && p->state == TASK_RUNNING &&
                    (!cputime_eq(p->utime, cputime_zero) ||
                     !cputime_eq(p->stime, cputime_zero)))
                        printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d\