[PATCH] powerpc: Avoid panic during boot due to divide by zero in init_cache_info()

[Benjamin Herrenschmidt]

On Sun, 2017-03-05 at 18:10 -0600, Segher Boessenkool wrote:
> You cannot really have something at address 0, the way NULL pointers
> are represented in GCC.  0 in firmware, so *fun*, especially before
> the
> CFAR was invented.  "Something jumped to 0, CTR is 0 so it's probably
> a BCTR, but which one of the 6000?"
> 
> What do you have at 0?  Not anything you need often I hope?

I think it was some kind of boot flag. I've had cases also of
copying the 0..0x100 region over with the kexec gunk etc...

Ben.