kernel-ark/kernel/irq/migration.c
Yinghai Lu 08678b0841 generic: sparse irqs: use irq_desc() together with dyn_array, instead of irq_desc[]
add CONFIG_HAVE_SPARSE_IRQ to for use condensed array.
Get rid of irq_desc[] array assumptions.

Preallocate 32 irq_desc, and irq_desc() will try to get more.

( No change in functionality is expected anywhere, except the odd build
  failure where we missed a code site or where a crossing commit itroduces
  new irq_desc[] usage. )

v2: according to Eric, change get_irq_desc() to irq_desc()

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-16 16:52:29 +02:00

76 lines
1.6 KiB
C

#include <linux/irq.h>
void set_pending_irq(unsigned int irq, cpumask_t mask)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
desc->status |= IRQ_MOVE_PENDING;
desc->pending_mask = mask;
spin_unlock_irqrestore(&desc->lock, flags);
}
void move_masked_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
cpumask_t tmp;
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
/*
* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
*/
if (CHECK_IRQ_PER_CPU(desc->status)) {
WARN_ON(1);
return;
}
desc->status &= ~IRQ_MOVE_PENDING;
if (unlikely(cpus_empty(desc->pending_mask)))
return;
if (!desc->chip->set_affinity)
return;
assert_spin_locked(&desc->lock);
cpus_and(tmp, desc->pending_mask, 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!
*
* For correct operation this depends on the caller
* masking the irqs.
*/
if (likely(!cpus_empty(tmp))) {
desc->chip->set_affinity(irq,tmp);
}
cpus_clear(desc->pending_mask);
}
void move_native_irq(int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
if (unlikely(desc->status & IRQ_DISABLED))
return;
desc->chip->mask(irq);
move_masked_irq(irq);
desc->chip->unmask(irq);
}