[RFC/PATCH 2/2] powerpc: irqtrace support to 64-bit powerpc

[Benjamin Herrenschmidt]

On Mon, 2007-10-22 at 15:35 +0200, Johannes Berg wrote:
> On Mon, 2007-10-15 at 17:28 +1000, Benjamin Herrenschmidt wrote:
> > This adds the low level irq tracing hooks to the powerpc architecture
> > needed to enable full lockdep functionality
> > 
> > Some rework from Johannes initial version, removing the asm trampoline that
> > isn't needed (thus improving perfs) and fixing a couple of bugs such as
> > incorrect initial preempt_count on the softirq alternate stack.
> 
> Hmm. It breaks booting on my quad, I finally got around to testing
> without this patch and it turns out that it caused the boot failure I
> reported in another mail. This is with v2.6.23-6623-g55b70a0, a clean
> tree boots fine but with these two patches applied and configured in it
> fails during boot, hanging at some point, apparently when userspace is
> entered.
> 
> On the other hand, it is fine with my original version. I'll have to
> find some time to check the differences hunk by hunk I guess.

Or I can try on my quad :-) I'll have a look. It did boot on some other
machines though. Funny.

Ben.