From: Keith Owens <kaos@sgi.com>
Date: Thu, 5 Jan 2006 23:36:06 +0000 (+1100)
Subject: [IA64] Add hotplug cpu to salinfo.c, replace semaphore with mutex
X-Git-Tag: v2.6.16-rc1~168^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e026cca0f2c09c4c28c902db6384fd8a412671d6;p=pandora-kernel.git

[IA64] Add hotplug cpu to salinfo.c, replace semaphore with mutex

Add hotplug cpu support to salinfo.c.

The cpu_event field is a cpumask so use the cpu_* macros consistently,
replacing the existing mixture of cpu_* and *_bit macros.

Instead of counting the number of outstanding events in a semaphore and
trying to track that count over user space context, interrupt context,
non-maskable interrupt context and cpu hotplug, replace the semaphore
with a test for "any bits set" combined with a mutex.

Modify the locking to make the test for "work to do" an atomic
operation.

Signed-off-by: Keith Owens <kaos@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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