Removes one call to compound_head() and a reference to page->mapping.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
mm/rmap.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/mm/rmap.c b/mm/rmap.c
index edc06c52bc82..aaab1c1078b4 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1098,22 +1098,20 @@ int pfn_mkclean_range(unsigned long pfn, unsigned long nr_pages, pgoff_t pgoff,
*/
void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
{
- struct anon_vma *anon_vma = vma->anon_vma;
- struct page *subpage = page;
-
- page = compound_head(page);
+ void *anon_vma = vma->anon_vma;
+ struct folio *folio = page_folio(page);
- VM_BUG_ON_PAGE(!PageLocked(page), page);
+ VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
VM_BUG_ON_VMA(!anon_vma, vma);
- anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
+ anon_vma += PAGE_MAPPING_ANON;
/*
* Ensure that anon_vma and the PAGE_MAPPING_ANON bit are written
* simultaneously, so a concurrent reader (eg folio_referenced()'s
* folio_test_anon()) will not see one without the other.
*/
- WRITE_ONCE(page->mapping, (struct address_space *) anon_vma);
- SetPageAnonExclusive(subpage);
+ WRITE_ONCE(folio->mapping, anon_vma);
+ SetPageAnonExclusive(page);
}
/**
--
2.35.1
