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s390/uv: Update PG_arch_1 comment

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We removed the usage of PG_arch_1 for page tables in commit
a51324c430db ("s390/cmma: rework no-dat handling").

Let's update the comment in UV to reflect that.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240508182955.358628-6-david@redhat.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
David Hildenbrand 2024-05-08 20:29:50 +02:00 committed by Alexander Gordeev
parent 036c0e104b
commit 80cf817949
1 changed files with 4 additions and 5 deletions
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9
arch/s390/kernel/uv.c
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@ -495,13 +495,12 @@ int arch_make_page_accessible(struct page *page)
return 0;
/*
* PG_arch_1 is used in 3 places:
* 1. for kernel page tables during early boot
* 2. for storage keys of huge pages and KVM
* 3. As an indication that this small folio might be secure. This can
* PG_arch_1 is used in 2 places:
* 1. for storage keys of hugetlb folios and KVM
* 2. As an indication that this small folio might be secure. This can
* overindicate, e.g. we set the bit before calling
* convert_to_secure.
* As secure pages are never huge, all 3 variants can co-exists.
* As secure pages are never large folios, both variants can co-exists.
*/
if (!test_bit(PG_arch_1, &folio->flags))
return 0;