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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