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s390/mm: Map empty zero pages read-only

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On arm64 the empty zero page is going to be mapped read-only [1].
Do the same for s390 with an explicit set_memory_ro() call.

[1] https://lore.kernel.org/all/20260427153416.2103979-19-ardb+git@google.com/

Suggested-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2026-05-11 12:52:39 +02:00 committed by Alexander Gordeev
parent a2cec68637
commit 29f23176e7
1 changed files with 2 additions and 0 deletions
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arch/s390/mm/init.c
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@ -84,6 +84,8 @@ void __init arch_setup_zero_pages(void)
empty_zero_page = (unsigned long)memblock_alloc_or_panic(PAGE_SIZE << order, PAGE_SIZE);
zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
set_memory_ro(empty_zero_page, 1UL << order);
}
void __init arch_zone_limits_init(unsigned long *max_zone_pfns)