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tracing: Don't assume possible cpu list have continuous numbers 

"for (++cpu ; cpu < num_possible_cpus(); cpu++)" statement assumes
possible cpus have continuous number - but that's a wrong assumption.

Insted, cpumask_next() should be used.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090310104437.A480.A69D9226@jp.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
KOSAKI Motohiro 2009-03-10 10:49:53 +09:00 committed by Ingo Molnar
parent 8293dd6f86
commit bbcd306359
1 changed files with 7 additions and 7 deletions
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12
kernel/trace/trace_workqueue.c
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@ -91,7 +91,7 @@ static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
struct cpu_workqueue_stats *cws;
unsigned long flags;
WARN_ON(cpu < 0 || cpu >= num_possible_cpus());
WARN_ON(cpu < 0);
/* Workqueues are sometimes created in atomic context */
cws = kzalloc(sizeof(struct cpu_workqueue_stats), GFP_ATOMIC);
@ -175,12 +175,12 @@ static void *workqueue_stat_next(void *prev, int idx)
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
if (list_is_last(&prev_cws->list, &workqueue_cpu_stat(cpu)->list)) {
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
for (++cpu ; cpu < num_possible_cpus(); cpu++) {
ret = workqueue_stat_start_cpu(cpu);
if (ret)
return ret;
}
do {
cpu = cpumask_next(cpu, cpu_possible_mask);
if (cpu >= nr_cpu_ids)
return NULL;
} while (!(ret = workqueue_stat_start_cpu(cpu)));
return ret;
}
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);