[PATCH 0/2] apic: Fix error interrupt report at all APs
From: Youquan Song
Date: Wed Jan 05 2011 - 22:30:09 EST
Recently, customer report that once machine boot, there are many error interrupt
reported with exact number of all APs.
The root cause is Local APIC will generate error interrupt when it detect
the illegal vector (one in 0 ~ 15) in an interrupt message received or
interrupt generate from local vector table or self IPI. SDM3A.chapter 10.
The thermal sensor register will be reset to 0x10000, current thermal throttling
driver will first restore AP with the thermal sensor register value of geting
from BSP,but BSP thermal sensor register is also set 0x10000. value 0x10000
means the interrupt vector is zero. After writing 0x10000 to thermal sensor LVT,
the processor will recieve the error interrupt report if the APIC error
interrupt is also set.
Restore thermal sensor value of BSP is useless because it will soon be set to
correct value included legal vector information. This patch remove the restore
process. So the agony noise of error interrupt will dismiss when machine boot.
In patchset also add print out error interrupt detail debug information.
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