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f1241c87a16c4fe9f4f51d6ed3589f031c505e8d
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3 Commits

Author SHA1 Message Date
Matthew Wilcox f1241c87a1 Add down_timeout and change ACPI to use it 
ACPI currently emulates a timeout for semaphores with calls to
down_trylock and sleep.  This produces horrible behaviour in terms of
fairness and excessive wakeups.  Now that we have a unified semaphore
implementation, adding a real down_trylock is almost trivial.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
 2008-04-17 10:42:46 -04:00
Matthew Wilcox f06d968658 Introduce down_killable() 
down_killable() is the functional counterpart of mutex_lock_killable.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
 2008-04-17 10:42:40 -04:00
Matthew Wilcox 64ac24e738 Generic semaphore implementation 
Semaphores are no longer performance-critical, so a generic C
implementation is better for maintainability, debuggability and
extensibility.  Thanks to Peter Zijlstra for fixing the lockdep
warning.  Thanks to Harvey Harrison for pointing out that the
unlikely() was unnecessary.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
 2008-04-17 10:42:34 -04:00