08678b0841
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>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
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#include <linux/irq.h>
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void set_pending_irq(unsigned int irq, cpumask_t mask)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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spin_lock_irqsave(&desc->lock, flags);
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desc->status |= IRQ_MOVE_PENDING;
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desc->pending_mask = mask;
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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void move_masked_irq(int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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cpumask_t tmp;
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if (likely(!(desc->status & IRQ_MOVE_PENDING)))
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return;
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/*
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* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
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*/
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if (CHECK_IRQ_PER_CPU(desc->status)) {
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WARN_ON(1);
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return;
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}
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desc->status &= ~IRQ_MOVE_PENDING;
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if (unlikely(cpus_empty(desc->pending_mask)))
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return;
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if (!desc->chip->set_affinity)
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return;
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assert_spin_locked(&desc->lock);
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cpus_and(tmp, desc->pending_mask, cpu_online_map);
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/*
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* If there was a valid mask to work with, please
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* do the disable, re-program, enable sequence.
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* This is *not* particularly important for level triggered
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* but in a edge trigger case, we might be setting rte
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* when an active trigger is comming in. This could
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* cause some ioapics to mal-function.
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* Being paranoid i guess!
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*
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* For correct operation this depends on the caller
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* masking the irqs.
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*/
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if (likely(!cpus_empty(tmp))) {
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desc->chip->set_affinity(irq,tmp);
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}
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cpus_clear(desc->pending_mask);
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}
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void move_native_irq(int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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if (likely(!(desc->status & IRQ_MOVE_PENDING)))
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return;
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if (unlikely(desc->status & IRQ_DISABLED))
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return;
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desc->chip->mask(irq);
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move_masked_irq(irq);
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desc->chip->unmask(irq);
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}
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