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Subject: Re: [PATCH 0/11] Patches for Toshiba Cell reference set
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
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Date: Wed, 07 Feb 2007 10:30:15 +1100
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On Wed, 2007-02-07 at 08:05 +1100, Paul Mackerras wrote:
> Ishizaki Kou writes:
> 
> > We found that following phenomenon:
> >  - An application calls "munmap"
> >  - do_munmap flushes TLB (so HTAB is invalidated)
> >  - when exiting spin_unlock(), DEC exception occurs. (!)
> >  - One of DEC handler causes data storage interrupt
> 
> Interesting.  Did you find out exactly what was causing the DSI in the
> decrementer interrupt handling?  It sounds like that is the real bug.

Not necessarily... DEC -> module -> vmalloc'ed or ioremap'ed access for
example would trigger a DSI.

The Hash routines expect irqs off when called.

Ben.