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generic: sparse irqs: use irq_desc() together with dyn_array, instead of irq_desc[]

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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>
This commit is contained in:
Yinghai Lu
2008-08-19 20:50:05 -07:00
committed by Ingo Molnar
parent bfea1238be
commit 08678b0841
28 changed files with 405 additions and 188 deletions
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24
arch/x86/kernel/irq_32.c
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@ -224,7 +224,7 @@ unsigned int do_IRQ(struct pt_regs *regs)
struct pt_regs *old_regs;
/* high bit used in ret_from_ code */
int overflow, irq = ~regs->orig_ax;
struct irq_desc *desc = irq_desc + irq;
struct irq_desc *desc = irq_to_desc(irq);
if (unlikely((unsigned)irq >= nr_irqs)) {
printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
@ -273,15 +273,16 @@ int show_interrupts(struct seq_file *p, void *v)
if (i < nr_irqs) {
unsigned any_count = 0;
struct irq_desc *desc = irq_to_desc(i);
spin_lock_irqsave(&irq_desc[i].lock, flags);
spin_lock_irqsave(&desc->lock, flags);
#ifndef CONFIG_SMP
any_count = kstat_irqs(i);
#else
for_each_online_cpu(j)
any_count |= kstat_cpu(j).irqs[i];
#endif
action = irq_desc[i].action;
action = desc->action;
if (!action && !any_count)
goto skip;
seq_printf(p, "%3d: ",i);
@ -291,8 +292,8 @@ int show_interrupts(struct seq_file *p, void *v)
for_each_online_cpu(j)
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
seq_printf(p, " %8s", irq_desc[i].chip->name);
seq_printf(p, "-%-8s", irq_desc[i].name);
seq_printf(p, " %8s", desc->chip->name);
seq_printf(p, "-%-8s", desc->name);
if (action) {
seq_printf(p, " %s", action->name);
@ -302,7 +303,7 @@ int show_interrupts(struct seq_file *p, void *v)
seq_putc(p, '\n');
skip:
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
spin_unlock_irqrestore(&desc->lock, flags);
} else if (i == nr_irqs) {
seq_printf(p, "NMI: ");
for_each_online_cpu(j)
@ -398,17 +399,20 @@ void fixup_irqs(cpumask_t map)
for (irq = 0; irq < nr_irqs; irq++) {
cpumask_t mask;
struct irq_desc *desc;
if (irq == 2)
continue;
cpus_and(mask, irq_desc[irq].affinity, map);
desc = irq_to_desc(irq);
cpus_and(mask, desc->affinity, map);
if (any_online_cpu(mask) == NR_CPUS) {
printk("Breaking affinity for irq %i\n", irq);
mask = map;
}
if (irq_desc[irq].chip->set_affinity)
irq_desc[irq].chip->set_affinity(irq, mask);
else if (irq_desc[irq].action && !(warned++))
if (desc->chip->set_affinity)
desc->chip->set_affinity(irq, mask);
else if (desc->action && !(warned++))
printk("Cannot set affinity for irq %i\n", irq);
}