[PATCH 2/2] mm: use a folio in fault_dirty_shared_page()

Peng Zhang
2023-06-30T12:13:31Z

From: ZhangPeng <zhangpeng362@huawei.com>

We can replace four implicit calls to compound_head() with one by using
folio.

Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
---
mm/memory.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 6921df44a99f..73b03706451c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2967,20 +2967,20 @@ static vm_fault_t fault_dirty_shared_page(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct address_space *mapping;
- struct page *page = vmf->page;
+ struct folio *folio = page_folio(vmf->page);
bool dirtied;
bool page_mkwrite = vma->vm_ops && vma->vm_ops->page_mkwrite;

- dirtied = set_page_dirty(page);
- VM_BUG_ON_PAGE(PageAnon(page), page);
+ dirtied = folio_mark_dirty(folio);
+ VM_BUG_ON_FOLIO(folio_test_anon(folio), folio);
/*
* Take a local copy of the address_space - page.mapping may be zeroed
* by truncate after unlock_page(). The address_space itself remains
* pinned by vma->vm_file's reference. We rely on unlock_page()'s
* release semantics to prevent the compiler from undoing this copying.
*/
- mapping = folio_raw_mapping(page_folio(page));
- unlock_page(page);
+ mapping = folio_raw_mapping(folio);
+ folio_unlock(folio);

if (!page_mkwrite)
file_update_time(vma->vm_file);
--
2.25.1