On Tue, 2006-10-24 at 15:17 +0800, Li Yang-r58472 wrote:

quoted

-----Original Message-----
From: Scott Wood [mailto:scottwood@freescale.com]
Sent: Tuesday, October 24, 2006 2:27 AM
To: Segher Boessenkool
Cc: mrz5149@acm.org; Li Yang-r58472; Paul Mackerras;

linuxppc-dev@ozlabs.org

quoted

Subject: Re: [PATCH] qe_ic: Do a sync when masking interrupts.

Segher Boessenkool wrote:

quoted

If a sync after an MMIO write is enough, then (in almost all
cases) so is an eieio.

In this case, the spurious interrupts still happen with eieio, but not
with sync.  

eieio on e300 core is just a no-op.

It's not sent to the bus on non-cahed storage (like the PCI bridge ?)
That's pretty bad ... there is quite a bit of code that assumes that
eieio's will prevent write combining...

Ben.