ARM: 7586/1: sp804: set cpumask to cpu_possible_mask for clock event device

The SP804 driver statically initialises the cpumask of the clock event
device to be cpu_all_mask, which is derived from the compile-time
constant NR_CPUS. This breaks SMP_ON_UP systems where the interrupt
controller handling the sp804 doesn't have the irq_set_affinity callback
on the irq_chip, because the common timer code fails to identify the
device as cpu-local and ends up treating it as a broadcast device
instead.

This patch fixes the problem by using cpu_possible_mask at runtime,
which will correctly represent the possible CPUs when SMP_ON_UP is being
used.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
index df13a3f..9d2d3ba 100644 (file)
--- a/arch/arm/common/timer-sp.c
+++ b/arch/arm/common/timer-sp.c
@@ -162,7 +162,6 @@ static struct clock_event_device sp804_clockevent = {
        .set_mode       = sp804_set_mode,
        .set_next_event = sp804_set_next_event,
        .rating         = 300,
-       .cpumask        = cpu_all_mask,
 };
 
 static struct irqaction sp804_timer_irq = {
@@ -185,6 +184,7 @@ void __init sp804_clockevents_init(void __iomem *base, unsigned int irq,
        clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
        evt->name = name;
        evt->irq = irq;
+       evt->cpumask = cpu_possible_mask;
 
        setup_irq(irq, &sp804_timer_irq);
        clockevents_config_and_register(evt, rate, 0xf, 0xffffffff);