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-rw-r--r--kernel/sched.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 39d6354..72a809a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4471,8 +4471,21 @@ long sched_setaffinity(pid_t pid, cpumask_t new_mask)
cpus_allowed = cpuset_cpus_allowed(p);
cpus_and(new_mask, new_mask, cpus_allowed);
+ again:
retval = set_cpus_allowed(p, new_mask);
+ if (!retval) {
+ cpus_allowed = cpuset_cpus_allowed(p);
+ if (!cpus_subset(new_mask, cpus_allowed)) {
+ /*
+ * We must have raced with a concurrent cpuset
+ * update. Just reset the cpus_allowed to the
+ * cpuset's cpus_allowed
+ */
+ new_mask = cpus_allowed;
+ goto again;
+ }
+ }
out_unlock:
put_task_struct(p);
mutex_unlock(&sched_hotcpu_mutex);
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