[PATCH] kernel/cpu: Move cpuhp_is_atomic_state() into #ifdef CONFIG_SMP

[Dou Liyang <douly.fnst@cn.fujitsu.com>]

Commit 17a2f1ced028 ("cpu/hotplug: Merge cpuhp_bp_states and cpuhp_ap_states")
removed the last use of cpuhp_is_atomic_state() in common case, that caused
Kernel produced a warning:

  'cpuhp_is_ap_state' defined but not used

So, Move it into #ifdef CONFIG_SMP

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
---
 kernel/cpu.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index a1860d42aacf..db7ec7572348 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -126,15 +126,6 @@ struct cpuhp_step {
 static DEFINE_MUTEX(cpuhp_state_mutex);
 static struct cpuhp_step cpuhp_hp_states[];
 
-static bool cpuhp_is_ap_state(enum cpuhp_state state)
-{
-	/*
-	 * The extra check for CPUHP_TEARDOWN_CPU is only for documentation
-	 * purposes as that state is handled explicitly in cpu_down.
-	 */
-	return state > CPUHP_BRINGUP_CPU && state != CPUHP_TEARDOWN_CPU;
-}
-
 static struct cpuhp_step *cpuhp_get_step(enum cpuhp_state state)
 {
 	return cpuhp_hp_states + state;
@@ -247,6 +238,15 @@ static inline void complete_ap_thread(struct cpuhp_cpu_state *st, bool bringup)
 	complete(done);
 }
 
+static bool cpuhp_is_ap_state(enum cpuhp_state state)
+{
+	/*
+	 * The extra check for CPUHP_TEARDOWN_CPU is only for documentation
+	 * purposes as that state is handled explicitly in cpu_down.
+	 */
+	return state > CPUHP_BRINGUP_CPU && state != CPUHP_TEARDOWN_CPU;
+}
+
 /*
  * The former STARTING/DYING states, ran with IRQs disabled and must not fail.
  */
-- 
2.14.3