s390/boot: Consider DCSS segments on memory layout setup

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The maximum mappable physical address (as returned by
arch_get_mappable_range() callback) is limited by the
value of (1UL << MAX_PHYSMEM_BITS).

The maximum physical address available to a DCSS segment
is 512GB.

In case the available online or offline memory size is less
than the DCSS limit arch_get_mappable_range() would include
never used [512GB..(1UL << MAX_PHYSMEM_BITS)] range.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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Alexander Gordeev 2024-03-01 07:03:49 +01:00

parent 47bf817672

commit b2b15f079c

2 changed files with 12 additions and 2 deletions

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7

arch/s390/boot/startup.c

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7

arch/s390/include/asm/extmem.h

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