s390/smp: reallocate IPL CPU lowcore

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The lowcore for IPL CPU is special. It is allocated early
in the boot process using memblock and never freed since.
The reason is pcpu_alloc_lowcore() and pcpu_free_lowcore()
routines use page allocator which is not available when
the IPL CPU is getting initialized.

Similar problem is already addressed for stacks - once the
virtual memory is available the early boot stacks get re-
allocated. Doing the same for lowcore will allow freeing
the IPL CPU lowcore and make no difference between the
boot and secondary CPUs.

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 16:26:52 +02:00 • committed by Vasily Gorbik

parent bdb8c9353e

commit 5789284710

2 changed files with 52 additions and 21 deletions

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21

arch/s390/kernel/setup.c

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52

arch/s390/kernel/smp.c

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