arm64: kernel: add CPU idle call

When CPU idle is enabled, the architectural idle call should go through
the idle subsystem to allow CPUs to enter idle states defined
by the platform CPU idle back-end operations.

This patch, mirroring other archs behaviour, adds the CPU idle call to the
architectural arch_cpu_idle implementation for arm64.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index de17c89985dbe6c69aecbb8248155f439fc41c11..50491ec4de34a5f291a04ed5cde3b3b47220bc66 100644 (file)
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -33,6 +33,7 @@
 #include <linux/kallsyms.h>
 #include <linux/init.h>
 #include <linux/cpu.h>
+#include <linux/cpuidle.h>
 #include <linux/elfcore.h>
 #include <linux/pm.h>
 #include <linux/tick.h>
@@ -98,8 +99,10 @@ void arch_cpu_idle(void)
         * This should do all the clock switching and wait for interrupt
         * tricks
         */
-       cpu_do_idle();
-       local_irq_enable();
+       if (cpuidle_idle_call()) {
+               cpu_do_idle();
+               local_irq_enable();
+       }
 }
 
 #ifdef CONFIG_HOTPLUG_CPU