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Subject[PATCH 14/29] arm64: arch_timer: Save cntkctl_el1 as a per-cpu variable
Date
From: Marc Zyngier <marc.zyngier@arm.com>

As we're about to allow per CPU cntkctl_el1 configuration, we cannot
rely on the register value to be common when performing power
management.

Let's turn saved_cntkctl into a per-cpu variable.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
drivers/clocksource/arm_arch_timer.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 395f5d9..5c114da 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -839,14 +839,14 @@ static int arch_timer_dying_cpu(unsigned int cpu)
}

#ifdef CONFIG_CPU_PM
-static unsigned int saved_cntkctl;
+static DEFINE_PER_CPU(unsigned long, saved_cntkctl);
static int arch_timer_cpu_pm_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
if (action == CPU_PM_ENTER)
- saved_cntkctl = arch_timer_get_cntkctl();
+ __this_cpu_write(saved_cntkctl, arch_timer_get_cntkctl());
else if (action == CPU_PM_ENTER_FAILED || action == CPU_PM_EXIT)
- arch_timer_set_cntkctl(saved_cntkctl);
+ arch_timer_set_cntkctl(__this_cpu_read(saved_cntkctl));
return NOTIFY_OK;
}

--
2.7.4
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