[RFC/PATCH] powerpc: Add irqtrace support to 32-bit powerpc

[Johannes Berg]

On Fri, 2008-02-01 at 12:50 -0700, Dale Farnsworth wrote:
> This adds the low level irq tracing hooks for 32-bit powerpc.
> This patch applies on top of Benjamin Herrenschmidt's patch that
> provides similar support for 64-bit powerpc.  See
> <http://ozlabs.org/pipermail/linuxppc-dev/2007-October/044361.html>
> 
> It seems to work on my prpmc2800 board with a ppc7447.

At first it appears to work on my powerbook (with Ben's latest version
of the 64-bit patch), but then it seems to cause random corruption, I've
had a crash in the ext3 code and one in console_callback(), both of
which I cannot otherwise explain.

johannes
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