Currently, we check cpu_ops->cpu_suspend every time when entering a
low-power idle state. But this check could be avoided in this hot path
by moving it into arm_cpuidle_init() to reduce arm_cpuidle_suspend()
overhead a bit.
Signed-off-by: Jisheng Zhang <jszh...@marvell.com>
---
arch/arm64/kernel/cpuidle.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index bd57c59..e11857f 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -19,7 +19,8 @@ int __init arm_cpuidle_init(unsigned int cpu)
{
int ret = -EOPNOTSUPP;
- if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_init_idle)
+ if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_suspend &&
+ cpu_ops[cpu]->cpu_init_idle)
ret = cpu_ops[cpu]->cpu_init_idle(cpu);
return ret;
@@ -36,10 +37,5 @@ int arm_cpuidle_suspend(int index)
{
int cpu = smp_processor_id();
- /*
- * If suspend has not been initialized, cpu_suspend call fails early.
- */
- if (!cpu_ops[cpu]->cpu_suspend)
- return -EOPNOTSUPP;
return cpu_ops[cpu]->cpu_suspend(index);
}
--
2.8.0.rc3
