On Fri, Oct 16, 2009 at 6:24 PM, Ralf Baechle <ralf@xxxxxxxxxxxxxx> wrote: > 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? Chungki. Could you anwer this question ? >> 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. Thansk for good explanation. Chungki. Please let us know your machine(processor and cache configuration) > > Ralf > -- Kind regards, Minchan Kim
