summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--kernel/cpu.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index a1ac7ea245d7..033603c1d7c3 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -301,6 +301,16 @@ int __ref cpu_down(unsigned int cpu)
cpu_clear(cpu, cpu_active_map);
+ /*
+ * Make sure the all cpus did the reschedule and are not
+ * using stale version of the cpu_active_map.
+ * This is not strictly necessary becuase stop_machine()
+ * that we run down the line already provides the required
+ * synchronization. But it's really a side effect and we do not
+ * want to depend on the innards of the stop_machine here.
+ */
+ synchronize_sched();
+
err = _cpu_down(cpu, 0);
if (cpu_online(cpu))