From 3efe62e466958a1e59e68e0faa5c66b5b99b17ce Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: Thu, 15 Oct 2020 20:05:56 -0700
Subject: mm/vmscan: allow arbitrary sized pages to be paged out

Remove the assumption that a compound page has HPAGE_PMD_NR pins from the
page cache.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SeongJae Park <sjpark@amazon.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: "Huang, Ying" <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-12-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/vmscan.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'mm')

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 879fb57c5045..fc4dee9b91f8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -725,8 +725,7 @@ static inline int is_page_cache_freeable(struct page *page)
 	 * that isolated the page, the page cache and optional buffer
 	 * heads at page->private.
 	 */
-	int page_cache_pins = PageTransHuge(page) && PageSwapCache(page) ?
-		HPAGE_PMD_NR : 1;
+	int page_cache_pins = thp_nr_pages(page);
 	return page_count(page) - page_has_private(page) == 1 + page_cache_pins;
 }
 
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