linux-kernel - [PATCH v2 05/28] gup: Change the calling convention for compound

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Message-Id: <20220110042406.499429-6-willy@infradead.org>
Date:   Mon, 10 Jan 2022 04:23:43 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        William Kucharski <william.kucharski@...cle.com>,
        linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH v2 05/28] gup: Change the calling convention for compound_next()

Return the head page instead of storing it to a passed parameter.

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

diff --git a/mm/gup.c b/mm/gup.c
index 6eedca605b3d..8a0ea220ced1 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -245,9 +245,8 @@ static inline struct page *compound_range_next(unsigned long i,
 	return page;
 }
 
-static inline void compound_next(unsigned long i, unsigned long npages,
-				 struct page **list, struct page **head,
-				 unsigned int *ntails)
+static inline struct page *compound_next(unsigned long i,
+		unsigned long npages, struct page **list, unsigned int *ntails)
 {
 	struct page *page;
 	unsigned int nr;
@@ -258,8 +257,8 @@ static inline void compound_next(unsigned long i, unsigned long npages,
 			break;
 	}
 
-	*head = page;
 	*ntails = nr - i;
+	return page;
 }
 
 /**
@@ -297,7 +296,7 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
 	}
 
 	for (index = 0; index < npages; index += ntails) {
-		compound_next(index, npages, pages, &head, &ntails);
+		head = compound_next(index, npages, pages, &ntails);
 		/*
 		 * Checking PageDirty at this point may race with
 		 * clear_page_dirty_for_io(), but that's OK. Two key
@@ -386,7 +385,7 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
 		return;
 
 	for (index = 0; index < npages; index += ntails) {
-		compound_next(index, npages, pages, &head, &ntails);
+		head = compound_next(index, npages, pages, &ntails);
 		put_compound_head(head, ntails, FOLL_PIN);
 	}
 }
-- 
2.33.0