[PATCH 01/22] Add powerpc-specific clear_cacheline(), which just compiles to "dcbz".

[Anton Blanchard]

Hi,

> This is horribly non-portable.  How much of a performance difference
> does it make?  How does it do on ppc64 systems where the cacheline
> size is not 32?

Yes, if anything we should catch cacheline aligned, multiple cacheline
sized zeroing in memset. 

Anton