On Thu, Jun 05, 2008 at 10:51:52PM +0100, Thiemo Seufer wrote: > > Ted, Ralf seems to be unwilling to accept the ZERO_PAGE() export. If you > > send the MIPS-specific patch, I can do the testing for you as I have a > > MIPS Malta board at my disposal. Ralf sent me a private note saying he would take care of this, but that he had been very busy with real-world life items. > AFAIU the problematic case are systems with R4000/R4400 SC/MC CPUs > since they use 8 zero pages of different color. Have a look at > arch/mips/mm/init.c:setup_zero_pages. Right. So we're not actually going to ever write to the page, but we are going to add the page to a bio and submit for writing. I assume that's not going to cause VECI/VCED exceptions, right? If the act of DMA'ing, or worse yet, for older devices/drivers which have to use PIO to write out a block device is going to cause "thousand and thousands of exceptions", it sounds like MIPS CPU designers need to be slapped silly.... - Ted
