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

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