From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Fri, 26 Feb 2010 21:37:40 +0000 (+0100)
Subject: [S390] spinlock: check virtual cpu running status
X-Git-Tag: v2.6.34-rc1~268^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=59b697874529f5c3cbcaf5816b3d6c584af521e8;p=pandora-kernel.git

[S390] spinlock: check virtual cpu running status

This patch introduces a new function that checks the running status
of a cpu in a hypervisor. This status is not virtualized, so the check
is only correct if running in an LPAR. On acquiring a spinlock, if the
cpu holding the lock is scheduled by the hypervisor, we do a busy wait
on the lock. If it is not scheduled, we yield over to that cpu.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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