Commit 4f167fb4 authored by Zhang, Yanmin's avatar Zhang, Yanmin Committed by Linus Torvalds

[PATCH] spurious interrupt fix

On my IA64 machine, after kernel 2.6.12-rc3 boots, an edge-triggered
interrupt (IRQ 46) keeps triggered over and over again.  There is no IRQ 46
interrupt action handler.  It has lots of impact on performance.

Kernel 2.6.10 and its prior versions have no the problem.  Basically,
kernel 2.6.10 will mask the spurious edge interrupt if the interrupt is
triggered for the second time and its status includes
IRQ_DISABLE|IRQ_PENDING.

Originally, IA64 kernel has its own specific _irq_desc definitions in file
arch/ia64/kernel/irq.c.  The definition initiates _irq_desc[irq].status to
IRQ_DISABLE.  Since kernel 2.6.11, it was moved to architecture independent
codes, i.e.  kernel/irq/handle.c, but kernel/irq/handle.c initiates
_irq_desc[irq].status to 0 instead of IRQ_DISABLE.
Signed-off-by: default avatarZhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 7baeb6a5
...@@ -30,6 +30,7 @@ ...@@ -30,6 +30,7 @@
*/ */
irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = { irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = { [0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
.handler = &no_irq_type, .handler = &no_irq_type,
.lock = SPIN_LOCK_UNLOCKED .lock = SPIN_LOCK_UNLOCKED
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment