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sched: fix: don't take a mutex from interrupt context

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print_cfs_stats is callable from interrupt context (sysrq), hence it should
not take mutexes. Change it to use RCU since the task group data is RCU
freed anyway.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2008-01-25 21:08:34 +01:00 committed by Ingo Molnar
parent 5fb5e6de55
commit 5973e5b954
1 changed files with 2 additions and 2 deletions
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4
kernel/sched_fair.c
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@ -1434,9 +1434,9 @@ static void print_cfs_stats(struct seq_file *m, int cpu)
#ifdef CONFIG_FAIR_GROUP_SCHED #ifdef CONFIG_FAIR_GROUP_SCHED
print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs); print_cfs_rq(m, cpu, &cpu_rq(cpu)->cfs);
#endif #endif
lock_task_group_list(); rcu_read_lock();
for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq) for_each_leaf_cfs_rq(cpu_rq(cpu), cfs_rq)
print_cfs_rq(m, cpu, cfs_rq); print_cfs_rq(m, cpu, cfs_rq);
unlock_task_group_list(); rcu_read_unlock();
} }
#endif #endif