Some of the parameters to __wait_on_bit() and __wait_on_bit_lock() are
redundant, as the wait_bit_queue parameter holds the flags word and the bit
number.  This patch updates __wait_on_bit() and __wait_on_bit_lock() to
fetch that information from the wait_bit_queue passed to them and so reduce
the number of parameters so that -mregparm may be more effective.

Incremental atop the complete out-of-lining of the contention cases and the
fastcall and wait_on_bit_lock()/test_and_set_bit() fixes.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>