futex: clean up fault logic

Impact: cleanup

Older versions of the futex code held the mmap_sem which had to
be dropped in order to call get_user(), so a two-pronged fault
handling mechanism was employed to handle faults of the atomic
operations.  The mmap_sem is no longer held, so get_user()
should be adequate.  This patch greatly simplifies the logic and
improves legibility.

Build and boot tested on a 4 way Intel x86_64 workstation.
Passes basic pthread_mutex and PI tests out of
ltp/testcases/realtime.

Signed-off-by: Darren Hart <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Rusty Russell <[email protected]>
LKML-Reference: <20090312075612.9856.48612.stgit@Aeon>
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions