i was curious about the level of usage of the various locking features in the kernel, so i was poking around using http://lxr.linux.no, and checked out the seqlock-related calls, and noticed that all of the IRQ-related seqlock calls don't seem to be used in the current kernel tree at all: http://lxr.linux.no/linux+v2.6.38/include/linux/seqlock.h#L239 if you select any of those calls starting at "write_seqlock_irqsave", it doesn't look like any of them are currently used. do they simply have no current value? just curious. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================