From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Date: Thu, 24 May 2012 12:38:26 +0000 (+0200)
Subject: s390/kernel: Fix smp_call_ipl_cpu() for offline CPUs
X-Git-Tag: v3.5-rc1~30^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=061da3dfb291570e780169918933ba51c2b7d554;p=pandora-kernel.git

s390/kernel: Fix smp_call_ipl_cpu() for offline CPUs

If the IPL CPU is offline, currently the pcpu_delegate() function
used by smp_call_ipl_cpu() does not work because pcpu_delegate()
modifies the lowcore of the target CPU. In case of an offline
IPL CPU currently the prefix register is zero but pcpu->lowcore
still points to the old prefix page. Therefore the lowcore changes
done by pcpu_delegate() have no effect.

With this fix pcpu_delegate() now uses memcpy_absolute() and therefore
also prepares the absolute zero lowcore if the target CPU has prefix
register zero.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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