s390/smp: do not preserve boot CPU lowcore on hotplug

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Once the kernel is running the boot CPU lowcore becomes
freeable and does not differ from the secondary CPU ones
in any way. Make use of it and do not preserve the boot
CPU lowcore on unplugging. That allows returning unused
memory when the boot CPU is offline and makes the code
more clear.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Alexander Gordeev 2021-05-06 16:26:53 +02:00 • committed by Vasily Gorbik

parent 5789284710

commit 587704efb3

1 changed files with 18 additions and 29 deletions

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arch/s390/kernel/smp.c

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