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mm/hugetlb: convert hugetlb_change_protection() to folios

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The for loop inside hugetlb_change_protection() increments by the huge
page size:

psize = huge_page_size(h);
for (; address < end; address += psize)

so we are operating on the head page of the huge pages between address and
end.  We can safely convert the struct page usage to struct folio.

Link: https://lkml.kernel.org/r/20250528192013.91130-1-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sidhartha Kumar
2025-05-28 15:20:13 -04:00
committed by Andrew Morton
parent 4a1ff347e4
commit cdf48aa832
1 changed files with 2 additions and 2 deletions
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4
mm/hugetlb.c
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@@ -7166,11 +7166,11 @@ long hugetlb_change_protection(struct vm_area_struct *vma,
/* Nothing to do. */
} else if (unlikely(is_hugetlb_entry_migration(pte))) {
swp_entry_t entry = pte_to_swp_entry(pte);
struct page *page = pfn_swap_entry_to_page(entry);
struct folio *folio = pfn_swap_entry_folio(entry);
pte_t newpte = pte;
if (is_writable_migration_entry(entry)) {
if (PageAnon(page))
if (folio_test_anon(folio))
entry = make_readable_exclusive_migration_entry(
swp_offset(entry));
else