Commit bfa05f4f authored Feb 14, 2012 by Marc Zyngier

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>

parent 66f75a5d

arch/arm/kernel/smp.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -454,6 +454,9 @@ static struct local_timer_ops *lt_ops;
		#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;