[PATCH v2 22/28] gup: Convert gup_huge_pmd() to use a folio

From: Matthew Wilcox (Oracle)
Date: Sun Jan 09 2022 - 23:27:27 EST


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(-)

diff --git a/mm/gup.c b/mm/gup.c
index 250326458df6..a006bce2d47b 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2492,7 +2492,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, 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 (!pmd_access_permitted(orig, flags & FOLL_WRITE))
@@ -2508,17 +2509,17 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
page = nth_page(pmd_page(orig), (addr & ~PMD_MASK) >> PAGE_SHIFT);
refs = record_subpages(page, addr, end, pages + *nr);

- head = try_grab_compound_head(pmd_page(orig), refs, flags);
- if (!head)
+ folio = try_grab_folio(page, refs, flags);
+ if (!folio)
return 0;

if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) {
- put_compound_head(head, refs, flags);
+ gup_put_folio(folio, refs, flags);
return 0;
}

*nr += refs;
- SetPageReferenced(head);
+ folio_set_referenced(folio);
return 1;
}

--
2.33.0