On Fri, Oct 16, 2009 at 02:17:19PM +0900, Minchan Kim wrote: > Many code of kernel fs usually allocate high page and flush. > But flush_dcache_page of mips checks PageHighMem to avoid flush > so that data consistency is broken, I think. What processor and cache configuration? > I found it's by you and Atsushi-san on 585fa724. > Why do we need the check? > Could you elaborte please? The if statement exists because __flush_dcache_page would crash if a page is not mapped. This of course isn't correct but that wasn't a problem since highmem still is only supported on machines that don't have aliases. Ralf
