Commit cdf48aa8 authored by Sidhartha Kumar's avatar Sidhartha Kumar Committed by Andrew Morton
Browse files

mm/hugetlb: convert hugetlb_change_protection() to folios 

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: default avatarSidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: default avatarOscar Salvador <osalvador@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 4a1ff347

mm/hugetlb.c

+2 −2
Original line number Diff line number Diff line
@@ -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