s390/boot: always align vmalloc area on segment boundary

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The size of vmalloc area depends from various factors
on boot and could be set to:

1. Default size as determined by VMALLOC_DEFAULT_SIZE macro;
2. One half of the virtual address space not occupied by
   modules and fixed mappings;
3. The size provided by user with vmalloc= kernel command
   line parameter;

In cases [1] and [2] the vmalloc area base address is aligned
on Region3 table type boundary, while in case [3] in might get
aligned on page boundary.

Limit the waste of page tables and always align vmalloc area
size and base address on segment boundary.

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

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This commit is contained in:

Alexander Gordeev 2023-07-16 10:56:00 +02:00

parent d12292fdea

commit 65f8780e2d

2 changed files with 3 additions and 2 deletions

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2

arch/s390/boot/ipl_parm.c

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3

arch/s390/boot/startup.c

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