On Wed, 7 Jan 2009 21:33:31 -0500 (EST) Steven Rostedt <rost...@goodmis.org> wrote:
> > On Wed, 7 Jan 2009, Linus Torvalds wrote: > > > Should that be: > > > > > > #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_MEMORY_HOTPLUG) > > > > Well, probably CONFIG_MEMORY_HOTREMOVE, no? And I'd actually suggest that > > unplugging should have a stop-machine if it doesn't already, just because > > it's such a special case - like module removal. > > I do not think stop-machine will help, unless that spinning is protected > by preempt-disable. If the task gets preempted after grabbing the owner > thread_info, and then stop-machine runs, the memory disappears, the task > is scheduled back, accesses the owner thread_info and then page-fault. > How about recording "cpu" into mutex at locking explicitly ? too bad ? -Kame -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
