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ARM: local timers: reserve local_timer_register() to SMP

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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 <[email protected]>
This commit is contained in:
Marc Zyngier 2012-02-14 11:25:58 +00:00
commit bfa05f4f33
1 changed files with 3 additions and 0 deletions
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3
arch/arm/kernel/smp.c
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@ -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;