linux-kernel - [PATCH 22/75] mm/gup: Convert gup_huge

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Date:   Fri,  4 Feb 2022 19:57:59 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        William Kucharski <william.kucharski@...cle.com>
Subject: [PATCH 22/75] mm/gup: Convert gup_huge_pmd() to use a folio

Use the new folio-based APIs.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: John Hubbard <jhubbard@...dia.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Reviewed-by: William Kucharski <william.kucharski@...cle.com>
---
 mm/gup.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 6faf8beb4cd9..ca8262392ce3 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2509,7 +2509,8 @@ 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))
@@ -2525,17 +2526,17 @@ 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;
 }
 
-- 
2.34.1