On Sat, 12 May 2007 17:42:00 +0900 (JST)
yamt@mwd.biglobe.ne.jp (YAMAMOTO Takashi) wrote:

> > Andrew (or someone else), do you know what is it? I mean, why do
> > I have to change all mutexes inside of the callout to IPL_SOFTCLOCK?
> 
> have you read mutex(9)?

That's what happens:

* sme_evtick runs at IPL_SOFTCLOCK.
* sme_gtredata is called from sme_evtick.
* sme_gtredata uses AcpiEvaluateObject in aiboost(4).
* AcpiEvaluateObject uses AcpiOsAcquireMutex.
* AcpiOsAcquireMutex uses IPL_NONE.

Boom.

-- 
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