Skip cache flushes in pmap_zero_page() and pmap_copy_page() on systems without virtual aliasing, or for pages which are not currently mapped cached. 1+% speed increase on sgi IP27 and loongson kernels.
Skip cache flushes in pmap_zero_page() and pmap_copy_page() on systems
without virtual aliasing, or for pages which are not currently mapped
cached. 1+% speed increase on sgi IP27 and loongson kernels.

Tested on LS2F, R4400, R5000, R12000 and R16000.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars