2007-07-31 (火) の 22:48 -0700 に Christoph Lameter さんは書きました:
> With todays git I get (sn2_defconfig w/ spinlock debuggin):
(snip.)
> ACPI: Error parsing MADT - no IOSAPIC entries
> register_intr: No IOSAPIC for GSI 52
> BUG: spinlock bad magic on CPU#0, swapper/0
> lock: a000000100bf66d0, .magic: 00000000, .owner: <none>/-1, .owner_cpu:
> 0
> unwind: cannot stack reg state!
>
> Call Trace:
> [<a000000100013900>] show_stack+0x40/0xa0
(snip.)
Hi,
I don't know why no IOSAPIC entries was found on your system.
But I think the cause of this stack trace is a bug in the code
path of interrupt registering failure. Here is a patch to fix
this bug. Could you try that?
Thanks,
Kenji Kaneshige
---
Fix wrong access to irq_desc[] in iosapic_register_intr().
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
---
arch/ia64/kernel/iosapic.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
Index: linux-2.6.23-rc1/arch/ia64/kernel/iosapic.c
===================================================================
--- linux-2.6.23-rc1.orig/arch/ia64/kernel/iosapic.c
+++ linux-2.6.23-rc1/arch/ia64/kernel/iosapic.c
@@ -794,8 +794,9 @@ iosapic_register_intr (unsigned int gsi,
err = register_intr(gsi, irq, IOSAPIC_LOWEST_PRIORITY,
polarity, trigger);
if (err < 0) {
+ spin_unlock(&irq_desc[irq].lock);
irq = err;
- goto unlock_all;
+ goto unlock_iosapic_lock;
}
/*
@@ -811,7 +812,7 @@ iosapic_register_intr (unsigned int gsi,
gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"),
(polarity == IOSAPIC_POL_HIGH ? "high" : "low"),
cpu_logical_id(dest), dest, irq_to_vector(irq));
- unlock_all:
+
spin_unlock(&irq_desc[irq].lock);
unlock_iosapic_lock:
spin_unlock_irqrestore(&iosapic_lock, flags);
-
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