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authorZhang, Yanmin <yanmin.zhang@intel.com>2005-05-16 21:53:43 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-17 07:59:18 -0700
commit4f167fb491725ca0be9df0d76b4b2dd862cdfe0b (patch)
treea4b15758261a9680d7f57530502ade350d99b46f /kernel
parent7baeb6a5ccab2d472679a053e64a63ac423c3a42 (diff)
downloadblackbird-op-linux-4f167fb491725ca0be9df0d76b4b2dd862cdfe0b.tar.gz
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[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: Zhang Yanmin <yanmin.zhang@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/handle.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 2fb0e46e11f3..06b5a6323998 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -30,6 +30,7 @@
*/
irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = {
+ .status = IRQ_DISABLED,
.handler = &no_irq_type,
.lock = SPIN_LOCK_UNLOCKED
}
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