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-rw-r--r--arch/powerpc/kernel/smp.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 8b2d2dc8ef10..8ec017cb4446 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -700,7 +700,6 @@ void start_secondary(void *unused)
smp_store_cpu_info(cpu);
set_dec(tb_ticks_per_jiffy);
preempt_disable();
- cpu_callin_map[cpu] = 1;
if (smp_ops->setup_cpu)
smp_ops->setup_cpu(cpu);
@@ -739,6 +738,14 @@ void start_secondary(void *unused)
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);
+ /*
+ * CPU must be marked active and online before we signal back to the
+ * master, because the scheduler needs to see the cpu_online and
+ * cpu_active bits set.
+ */
+ smp_wmb();
+ cpu_callin_map[cpu] = 1;
+
local_irq_enable();
cpu_startup_entry(CPUHP_ONLINE);