x86: make HAVE_SPARSE_IRQ support selectable

Ingo said sparse_irq is some intrusive. need to make it selectable

to make it simple, remove irq_desc as parameter in some functions.
(ack, eoi, set_affinity).
may need to make member if irq_chip to take irq_desc, or struct irq later.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 348a11168c2b..c2fca89a3f7e 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -74,7 +74,7 @@ int show_interrupts(struct seq_file *p, void *v)
         struct irqaction * action;
         unsigned long flags;
         unsigned int entries;
-        struct irq_desc *desc;
+        struct irq_desc *desc = NULL;
         int tail = 0;
 
 #ifdef CONFIG_HAVE_SPARSE_IRQ