Re: [PATCH v2 23/28] gup: Convert gup_huge_pud() to use a folio

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On 1/9/22 20:24, Matthew Wilcox (Oracle) wrote:
Use the new folio-based APIs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
  mm/gup.c | 11 ++++++-----
  1 file changed, 6 insertions(+), 5 deletions(-)

Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>


thanks,
--
John Hubbard
NVIDIA


diff --git a/mm/gup.c b/mm/gup.c
index a006bce2d47b..7b7bf8361558 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2527,7 +2527,8 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
  			unsigned long end, unsigned int flags,
  			struct page **pages, int *nr)
  {
-	struct page *head, *page;
+	struct page *page;
+	struct folio *folio;
  	int refs;
if (!pud_access_permitted(orig, flags & FOLL_WRITE))
@@ -2543,17 +2544,17 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
  	page = nth_page(pud_page(orig), (addr & ~PUD_MASK) >> PAGE_SHIFT);
  	refs = record_subpages(page, addr, end, pages + *nr);
- head = try_grab_compound_head(pud_page(orig), refs, flags);
-	if (!head)
+	folio = try_grab_folio(page, refs, flags);
+	if (!folio)
  		return 0;
if (unlikely(pud_val(orig) != pud_val(*pudp))) {
-		put_compound_head(head, refs, flags);
+		gup_put_folio(folio, refs, flags);
  		return 0;
  	}
*nr += refs;
-	SetPageReferenced(head);
+	folio_set_referenced(folio);
  	return 1;
  }




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