The following four patches add support for interruptible trying to grab
R/W-semaphores (patches by Nick Piggin), and use (interruptible) rwsems
to improve the disabling of CPU hotplug operations. The latter was
already discussed earlier on this list[1].
Dominik
[1] http://marc.theaimsgroup.com/?t=109929898200001&r=1&w=2