[PATCH v3 03/10] mprotect: Use pfn_swap_entry_folio

Matthew Wilcox (Oracle)
2024-01-11T15:25:09Z

We only want to know whether the folio is anonymous, so use
pfn_swap_entry_folio() and save a call to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
mm/mprotect.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 81991102f785..f8a4544b4601 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -198,13 +198,13 @@ static long change_pte_range(struct mmu_gather *tlb,
pte_t newpte;

if (is_writable_migration_entry(entry)) {
- struct page *page = pfn_swap_entry_to_page(entry);
+ struct folio *folio = pfn_swap_entry_folio(entry);

/*
* A protection check is difficult so
* just be safe and disable write
*/
- if (PageAnon(page))
+ if (folio_test_anon(folio))
entry = make_readable_exclusive_migration_entry(
swp_offset(entry));
else
--
2.43.0