On Tue, 13 Apr 2010, Helge Deller wrote: > Still crashes. After thinking about this some more, I believe out updating of pte's is broken. We have a lock, pa_dbit_lock, but this is only used in the dbit traps. Even there, the implementation is flawed on SMP machines. The fundamental issue is a pte can't be updated in one instruction. The old pte has to be loaded, modified, and then written back to memory. It this isn't made atomic with a lock, we drop write protect, dirty, and accessed bits occassionally. Dave -- J. David Anglin dave.anglin@xxxxxxxxxxxxxx National Research Council of Canada (613) 990-0752 (FAX: 952-6602) -- 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
