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x86/ioapic.c: move lost comment to what seems like appropriate place

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The comment got separated from its subject, so move it to what
appears to be the right place, and update to describe the current
structure.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-06-08 03:14:59 -07:00
parent 83c21bedf6
commit 8e13d697fe
1 changed files with 5 additions and 7 deletions
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12
arch/x86/kernel/apic/io_apic.c
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@ -116,13 +116,6 @@ static int __init parse_noapic(char *str)
} }
early_param("noapic", parse_noapic); early_param("noapic", parse_noapic);
/*
* This is performance-critical, we want to do it O(1)
*
* the indexing order of this array favors 1:1 mappings
* between pins and IRQs.
*/
struct irq_pin_list { struct irq_pin_list {
int apic, pin; int apic, pin;
struct irq_pin_list *next; struct irq_pin_list *next;
@ -137,6 +130,11 @@ static struct irq_pin_list *get_one_free_irq_2_pin(int node)
return pin; return pin;
} }
/*
* This is performance-critical, we want to do it O(1)
*
* Most irqs are mapped 1:1 with pins.
*/
struct irq_cfg { struct irq_cfg {
struct irq_pin_list *irq_2_pin; struct irq_pin_list *irq_2_pin;
cpumask_var_t domain; cpumask_var_t domain;