On Fri, Mar 26, 2004 at 12:22:58PM +0900, Atsushi Nemoto wrote: > > phorton> Looks like it. > > phorton> The fix we're using on Cobalt's at the moment is below > phorton> (required for 2.4.x and 2.6.x). > > phorton> Fixing it this way fixes the problem with both page cache > phorton> pages and swap pages. > > phorton> For more details see the threads "Kernel 2.4.23 on Cobalt > phorton> Qube2 - area of problem" and "Instability / caching problems > phorton> on Qube 2 - solved ?" from December last year. > > Thanks, I agree (maybe I should read ML messages more carefully ...) > > This patch fixes my problem also, thanks, but ... I do not think > r4k_flush_icache_page is a best place to fix since my test program is > not related I-cache at all. > Agreed. The fix went here because this is arch specific code and it's called in exactly the two places where there is a problem. > I'm quite sure that it's a kernel bug and may cause problems if any > PIO block device (PIO ide, ide-cs, mtdblock, etc.) are used on CPUs > which have d-cache aliases (not only MIPS). We need a correct fix ... > True. A proper fix would flush the relevant page after PIO transfers into the page cache / swap pages. Unfortunately this would require a hook in the generic kernel. P.
