ARM: 8485/1: cpuidle: remove cpu parameter from the cpuidle_ops suspend hook

The suspend() hook in the cpuidle_ops struct is always called on
the cpu entering idle, which means that the cpu parameter passed
to the suspend hook always corresponds to the local cpu, making
it somewhat redundant.

This patch removes the logical cpu parameter from the ARM
cpuidle_ops.suspend hook and updates all the existing kernel
implementations to reflect this change.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Lina Iyer <lina.iyer@linaro.org>
Tested-by: Lina Iyer <lina.iyer@linaro.org>
Tested-by: Jisheng Zhang <jszhang@marvell.com> [psci]
Cc: Lina Iyer <lina.iyer@linaro.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
(cherry picked from commit f6419f240b15f967713c5cd6857dfba8fb390589)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

Author: Lorenzo Pieralisi

arch/arm/include/asm/cpuidle.h

@@ -30,7 +30,7 @@ static inline int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
 struct device_node;
 
 struct cpuidle_ops {
-	int (*suspend)(int cpu, unsigned long arg);
+	int (*suspend)(unsigned long arg);
 	int (*init)(struct device_node *, int cpu);
 };
 

arch/arm/kernel/cpuidle.c

@@ -56,7 +56,7 @@ int arm_cpuidle_suspend(int index)
 	int cpu = smp_processor_id();
 
 	if (cpuidle_ops[cpu].suspend)
-		ret = cpuidle_ops[cpu].suspend(cpu, index);
+		ret = cpuidle_ops[cpu].suspend(index);
 
 	return ret;
 }

drivers/soc/qcom/spm.c

@@ -116,7 +116,7 @@ static const struct spm_reg_data spm_reg_8064_cpu = {
 
 static DEFINE_PER_CPU(struct spm_driver_data *, cpu_spm_drv);
 
-typedef int (*idle_fn)(int);
+typedef int (*idle_fn)(void);
 static DEFINE_PER_CPU(idle_fn*, qcom_idle_ops);
 
 static inline void spm_register_write(struct spm_driver_data *drv,
@@ -179,10 +179,10 @@ static int qcom_pm_collapse(unsigned long int unused)
 	return -1;
 }
 
-static int qcom_cpu_spc(int cpu)
+static int qcom_cpu_spc(void)
 {
 	int ret;
-	struct spm_driver_data *drv = per_cpu(cpu_spm_drv, cpu);
+	struct spm_driver_data *drv = __this_cpu_read(cpu_spm_drv);
 
 	spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
 	ret = cpu_suspend(0, qcom_pm_collapse);
@@ -197,9 +197,9 @@ static int qcom_cpu_spc(int cpu)
 	return ret;
 }
 
-static int qcom_idle_enter(int cpu, unsigned long index)
+static int qcom_idle_enter(unsigned long index)
 {
-	return per_cpu(qcom_idle_ops, cpu)[index](cpu);
+	return __this_cpu_read(qcom_idle_ops)[index]();
 }
 
 static const struct of_device_id qcom_idle_state_match[] __initconst = {