From: Matthew Wilcox <matthew@wil.cx>
Date: Fri, 14 Mar 2008 17:43:13 +0000 (-0400)
Subject: Add down_timeout and change ACPI to use it
X-Git-Tag: v2.6.26-rc1~1155^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f1241c87a16c4fe9f4f51d6ed3589f031c505e8d;p=pandora-kernel.git

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>
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