linux-kernel - [PATCH v4 23/36] mm: Allow large pages to be removed from the page cache

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Message-Id: <20200515131656.12890-24-willy@infradead.org>
Date:   Fri, 15 May 2020 06:16:43 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 23/36] mm: Allow large pages to be removed from the page cache

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

page_cache_free_page() assumes compound pages are PMD_SIZE; fix
that assumption.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 mm/filemap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 437484d42b78..9c760dd7208e 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -248,7 +248,7 @@ static void page_cache_free_page(struct address_space *mapping,
 		freepage(page);
 
 	if (PageTransHuge(page) && !PageHuge(page)) {
-		page_ref_sub(page, HPAGE_PMD_NR);
+		page_ref_sub(page, hpage_nr_pages(page));
 		VM_BUG_ON_PAGE(page_count(page) <= 0, page);
 	} else {
 		put_page(page);
-- 
2.26.2