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irq: replace loop with nr_irqs with for_each_irq_desc

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There are a handful of loops that go from 0 to nr_irqs and use
get_irq_desc() on them. These would allocate all the irq_desc
entries, regardless of the need for them.

Use the smarter for_each_irq_desc() iterator that will only iterate
over the present ones.

v2: make sure arch without GENERIC_HARDIRQS work too

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 20:50:11 -07:00
committed by Ingo Molnar
parent 9059d8fa4a
commit 2c6927a38f
7 changed files with 25 additions and 26 deletions
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10
kernel/irq/proc.c
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@@ -182,11 +182,10 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
#define MAX_NAMELEN 10
void register_irq_proc(unsigned int irq)
void register_irq_proc(unsigned int irq, struct irq_desc *desc)
{
char name [MAX_NAMELEN];
struct proc_dir_entry *entry;
struct irq_desc *desc = irq_to_desc(irq);
if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir)
return;
@@ -230,7 +229,8 @@ void register_default_affinity_proc(void)
void init_irq_proc(void)
{
int i;
unsigned int irq;
struct irq_desc *desc;
/* create /proc/irq */
root_irq_dir = proc_mkdir("irq", NULL);
@@ -242,7 +242,7 @@ void init_irq_proc(void)
/*
* Create entries for all existing IRQs.
*/
for (i = 0; i < nr_irqs; i++)
register_irq_proc(i);
for_each_irq_desc(irq, desc)
register_irq_proc(irq, desc);
}