s390/uv: Convert PG_arch_1 users to only work on small folios

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Now that make_folio_secure() may only set PG_arch_1 for small folios,
let's convert relevant remaining UV code to only work on (small) folios
and simply reject large folios early. This way, we'll never end up
touching PG_arch_1 on tail pages of a large folio in UV code.

The folio_get()/folio_put() for functions that are documented to already
hold a folio reference look weird; likely they are required to make
concurrent gmap_make_secure() back off because the caller might only hold
an implicit reference due to the page mapping. So leave that alone for now.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240508182955.358628-5-david@redhat.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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David Hildenbrand 2024-05-08 20:29:49 +02:00 • committed by Alexander Gordeev

parent eef88fe45a

commit 036c0e104b

2 changed files with 27 additions and 16 deletions

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arch/s390/include/asm/page.h

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41

arch/s390/kernel/uv.c

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