[PATCH -rt] yet another irq storm

From: Steven Rostedt
Date: Fri Apr 27 2007 - 23:13:18 EST

Must be global warming, I'm getting a lot more irq storms than usual.

Now that I switched over to x86_64, I booted up and got another irq
storm. So I added my previous patch and it didn't fix it. Looking
further, I found that the mask and unmask is done directly in the
x86_64/io_apic.c file.

This patch does basically the same thing as my previous patch, but to
the x86_64/io_apic.c file.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

Index: linux-2.6.21-rt1/arch/x86_64/kernel/io_apic.c
--- linux-2.6.21-rt1.orig/arch/x86_64/kernel/io_apic.c
+++ linux-2.6.21-rt1/arch/x86_64/kernel/io_apic.c
@@ -1437,7 +1437,8 @@ static void ack_apic_level(unsigned int
/* If we are moving the irq we need to mask it */
- if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) {
+ if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING) &&
+ !(irq_desc[irq].status & IRQ_INPROGRESS)) {
do_unmask_irq = 1;

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/