On 12/22/2010 05:22 PM, James Bottomley wrote: > The kernel has an 8M tmpailas space (originally designed for copying > and clearing pages but now only used for clearing). The idea is > to place zeros into the cache above a physical page rather than into > the physical page and flush the cache, because often the zeros end up > being replaced quickly anyway. > > We can also use the tmpalias space for flushing a page. The difference > here is that we have to do tmpalias processing in the non access data and > instruction traps. The principle is the same: as long as we know the physical > address and have a virtual address congruent to the real one, the flush will > be effective. > > In order to use the tmpalias space, the icache miss path has to be enhanced to > check for the alias region to make the fic instruction effective. > > Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> Hi James, Cool, I assume this patch intends to fix the "Threads and fork on VIPT-WB machines" bug as described here: http://wiki.parisc-linux.org/TestCases ? I did some initial testing and it seems to really fix it... I'll continue testing during the next few days (with 2.6.37-rc7-32bit). Helge BTW: compilation gives one small warning: arch/parisc/kernel/cache.c: In function 'flush_dcache_page': arch/parisc/kernel/cache.c:310: warning: pointer type mismatch in conditional expression arch/parisc/kernel/cache.c:310: warning: format '%s' expects type 'char *', but argument 4 has type 'void * const' -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
