kernel 2.6: exec & futex_unlock_pi(): backports from upstream (from wl500g.googlecode.com)
kernel.org commits:
187226f57f1381cfc63216979b4375f30e593795 futex_unlock_pi() hurts my brain and may cause application deadlock
ed5d2cac114202fe2978a9cbcab8f5032796d538 exec: rework the group exit and fix the race with kill
573cf9ad72c13750e86c91de43477e9dfb440523 signals: do_signal_stop(): use signal_group_exit()
bfc4b0890af566940de6e7aeb4b5faf46d3c3513 signals: do_group_exit(): use signal_group_exit() more consistently
92413d771e7123304fb4b9efd2a00cccc946e383 signals: dequeue_signal: don't check SIGNAL_GROUP_EXIT when setting SIGNAL_STOP_DEQUEUED