We still have to keep the page around because we need to know which
page in the folio we're copying, but we can replace five implict calls
to compound_head() with one.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
mm/memory.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 7aa741a3cd9f..ec833a2e0601 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -906,25 +906,28 @@ copy_present_pte(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
unsigned long vm_flags = src_vma->vm_flags;
pte_t pte = *src_pte;
struct page *page;
+ struct folio *folio;
page = vm_normal_page(src_vma, addr, pte);
- if (page && PageAnon(page)) {
+ if (page)
+ folio = page_folio(page);
+ if (page && folio_test_anon(folio)) {
/*
* If this page may have been pinned by the parent process,
* copy the page immediately for the child so that we'll always
* guarantee the pinned page won't be randomly replaced in the
* future.
*/
- get_page(page);
+ folio_get(folio);
if (unlikely(page_try_dup_anon_rmap(page, false, src_vma))) {
- /* Page maybe pinned, we have to copy. */
- put_page(page);
+ /* Page may be pinned, we have to copy. */
+ folio_put(folio);
return copy_present_page(dst_vma, src_vma, dst_pte, src_pte,
addr, rss, prealloc, page);
}
rss[MM_ANONPAGES]++;
} else if (page) {
- get_page(page);
+ folio_get(folio);
page_dup_file_rmap(page, false);
rss[mm_counter_file(page)]++;
}
@@ -937,7 +940,7 @@ copy_present_pte(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
ptep_set_wrprotect(src_mm, addr, src_pte);
pte = pte_wrprotect(pte);
}
- VM_BUG_ON(page && PageAnon(page) && PageAnonExclusive(page));
+ VM_BUG_ON(page && folio_test_anon(folio) && PageAnonExclusive(page));
/*
* If it's a shared mapping, mark it clean in
--
2.35.1
