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-rw-r--r--kernel/cpu.c4
-rw-r--r--kernel/sched/idle.c7
2 files changed, 9 insertions, 2 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 1972b161c61e..d46b4dae0ca0 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -408,8 +408,10 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
*
* Wait for the stop thread to go away.
*/
- while (!idle_cpu(cpu))
+ while (!per_cpu(cpu_dead_idle, cpu))
cpu_relax();
+ smp_mb(); /* Read from cpu_dead_idle before __cpu_die(). */
+ per_cpu(cpu_dead_idle, cpu) = false;
/* This actually kills the CPU. */
__cpu_die(cpu);
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 94b2d7b88a27..e99e361ade20 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -198,6 +198,8 @@ exit_idle:
start_critical_timings();
}
+DEFINE_PER_CPU(bool, cpu_dead_idle);
+
/*
* Generic idle loop implementation
*
@@ -222,8 +224,11 @@ static void cpu_idle_loop(void)
check_pgt_cache();
rmb();
- if (cpu_is_offline(smp_processor_id()))
+ if (cpu_is_offline(smp_processor_id())) {
+ smp_mb(); /* all activity before dead. */
+ this_cpu_write(cpu_dead_idle, true);
arch_cpu_idle_dead();
+ }
local_irq_disable();
arch_cpu_idle_enter();