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authorYinghai Lu <yhlu.kernel@gmail.com>2008-08-20 05:50:11 +0200
committerIngo Molnar <mingo@elte.hu>2008-10-16 16:52:33 +0200
commit2c6927a38f65b53b62f86158fba29a068c4e8b6a (patch)
tree4f23cf5689c8fbaed771219b4afd3f785d8048bc /arch/x86/kernel/irqinit_64.c
parentirq: add irq_desc_without_new (diff)
downloadlinux-2c6927a38f65b53b62f86158fba29a068c4e8b6a.tar.xz
linux-2c6927a38f65b53b62f86158fba29a068c4e8b6a.zip
irq: replace loop with nr_irqs with for_each_irq_desc
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>
Diffstat (limited to 'arch/x86/kernel/irqinit_64.c')
-rw-r--r--arch/x86/kernel/irqinit_64.c17
1 files changed, 5 insertions, 12 deletions
diff --git a/arch/x86/kernel/irqinit_64.c b/arch/x86/kernel/irqinit_64.c
index 0744b49b4d12..cd9f42d028d9 100644
--- a/arch/x86/kernel/irqinit_64.c
+++ b/arch/x86/kernel/irqinit_64.c
@@ -142,25 +142,18 @@ void __init init_ISA_irqs(void)
init_bsp_APIC();
init_8259A(0);
- for (i = 0; i < nr_irqs; i++) {
+ for (i = 0; i < 16; i++) {
struct irq_desc *desc = irq_to_desc(i);
desc->status = IRQ_DISABLED;
desc->action = NULL;
desc->depth = 1;
- if (i < 16) {
- /*
- * 16 old-style INTA-cycle interrupts:
- */
- set_irq_chip_and_handler_name(i, &i8259A_chip,
+ /*
+ * 16 old-style INTA-cycle interrupts:
+ */
+ set_irq_chip_and_handler_name(i, &i8259A_chip,
handle_level_irq, "XT");
- } else {
- /*
- * 'high' PCI IRQs filled in on demand
- */
- desc->chip = &no_irq_chip;
- }
}
}