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Subject[PATCH cpuset] Use rebuild_sched_domains() in cpuset_hotplug_workfn()
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In cpuset_hotplug_workfn(), partition_sched_domains() is called without
hotplug lock held, which is actually needed (stated in the function
header of partition_sched_domains()).

This patch tries to use rebuild_sched_domains() to solve the above
issue, and makes the code looks a little simpler.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
---
kernel/cpuset.c | 13 ++-----------
1 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 4f9dfe4..515a713 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2222,17 +2222,8 @@ static void cpuset_hotplug_workfn(struct work_struct *work)
flush_workqueue(cpuset_propagate_hotplug_wq);

/* rebuild sched domains if cpus_allowed has changed */
- if (cpus_updated) {
- struct sched_domain_attr *attr;
- cpumask_var_t *doms;
- int ndoms;
-
- mutex_lock(&cpuset_mutex);
- ndoms = generate_sched_domains(&doms, &attr);
- mutex_unlock(&cpuset_mutex);
-
- partition_sched_domains(ndoms, doms, attr);
- }
+ if (cpus_updated)
+ rebuild_sched_domains();
}

void cpuset_update_active_cpus(bool cpu_online)



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