forked from Minki/linux
89d0cf01c0
If you get to that point in the code it means that desc->move_irq is set, pending_irq_cpumask[irq] and cpu_online_map should have a value. Still pretty good chance anding those two you'll still have a value. So these two branch predictors should be inverted. Signed-off-by: Daniel Walker <dwalker@mvista.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
|
|
#include <linux/irq.h>
|
|
|
|
void set_pending_irq(unsigned int irq, cpumask_t mask)
|
|
{
|
|
irq_desc_t *desc = irq_desc + irq;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
desc->move_irq = 1;
|
|
pending_irq_cpumask[irq] = mask;
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
void move_native_irq(int irq)
|
|
{
|
|
cpumask_t tmp;
|
|
irq_desc_t *desc = irq_descp(irq);
|
|
|
|
if (likely(!desc->move_irq))
|
|
return;
|
|
|
|
/*
|
|
* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
|
|
*/
|
|
if (CHECK_IRQ_PER_CPU(desc->status)) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
desc->move_irq = 0;
|
|
|
|
if (unlikely(cpus_empty(pending_irq_cpumask[irq])))
|
|
return;
|
|
|
|
if (!desc->handler->set_affinity)
|
|
return;
|
|
|
|
assert_spin_locked(&desc->lock);
|
|
|
|
cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
|
|
|
|
/*
|
|
* If there was a valid mask to work with, please
|
|
* do the disable, re-program, enable sequence.
|
|
* This is *not* particularly important for level triggered
|
|
* but in a edge trigger case, we might be setting rte
|
|
* when an active trigger is comming in. This could
|
|
* cause some ioapics to mal-function.
|
|
* Being paranoid i guess!
|
|
*/
|
|
if (likely(!cpus_empty(tmp))) {
|
|
if (likely(!(desc->status & IRQ_DISABLED)))
|
|
desc->handler->disable(irq);
|
|
|
|
desc->handler->set_affinity(irq,tmp);
|
|
|
|
if (likely(!(desc->status & IRQ_DISABLED)))
|
|
desc->handler->enable(irq);
|
|
}
|
|
cpus_clear(pending_irq_cpumask[irq]);
|
|
}
|