ARM: local timers: reserve local_timer_register() to SMP
When running an SMP_ON_UP enabled kernel on UP, or with nosmp
passed to the kernel, we want to be able to detect that a local
timer is not going to be used (local timers are only used on
SMP platforms), so we could register it as a global timer instead.
Return -ENXIO when the above case is detected.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index addbbe8..11c4148 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -454,6 +454,9 @@
#ifdef CONFIG_LOCAL_TIMERS
int local_timer_register(struct local_timer_ops *ops)
{
+ if (!is_smp() || !setup_max_cpus)
+ return -ENXIO;
+
if (lt_ops)
return -EBUSY;