* [Patch] IA64 Kdump don't clear vector in kexec_disable_iosapic
@ 2006-10-25 4:40 Zou Nan hai
0 siblings, 0 replies; only message in thread
From: Zou Nan hai @ 2006-10-25 4:40 UTC (permalink / raw)
To: linux-ia64
Hi Tony,
This patch is from Naoaki-san.
Mask IOSAPIC will make the following EOI write to IOSAPIC fail because
IOSAPIC will not be able to find RTE entry.
However move EOI write before IOSAPIC mask will leave a small
racy windows between them for interrupts. So mask IOSAPIC but leave the
vector field.
The patch is against your test tree.
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
--- linux-2.6/arch/ia64/kernel/iosapic.c 2006-10-25 14:37:30.000000000 +0800
+++ b/arch/ia64/kernel/iosapic.c 2006-10-25 14:41:34.000000000 +0800
@@ -303,7 +303,7 @@ kexec_disable_iosapic(void)
rte_list) {
iosapic_write(rte->addr,
IOSAPIC_RTE_LOW(rte->rte_index),
- IOSAPIC_MASK);
+ IOSAPIC_MASK|vec);
iosapic_eoi(rte->addr, vec);
}
}
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2006-10-25 4:40 [Patch] IA64 Kdump don't clear vector in kexec_disable_iosapic Zou Nan hai
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