mm: frontswap: fix a wrong if condition in frontswap_shrink

[Zhenzhong Duan <zhenzhong.duan@oracle.com>]

pages_to_unuse is set to 0 to unuse all frontswap pages
But that doesn't happen since a wrong condition in frontswap_shrink
cancels it.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
---
 mm/frontswap.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/frontswap.c b/mm/frontswap.c
index 6b3e71a..db2a86f 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -275,7 +275,7 @@ static int __frontswap_shrink(unsigned long target_pages,
 	if (total_pages <= target_pages) {
 		/* Nothing to do */
 		*pages_to_unuse = 0;
-		return 0;
+		return 1;
 	}
 	total_pages_to_unuse = total_pages - target_pages;
 	return __frontswap_unuse_pages(total_pages_to_unuse, pages_to_unuse, type);
@@ -302,7 +302,7 @@ void frontswap_shrink(unsigned long target_pages)
 	spin_lock(&swap_lock);
 	ret = __frontswap_shrink(target_pages, &pages_to_unuse, &type);
 	spin_unlock(&swap_lock);
-	if (ret == 0 && pages_to_unuse)
+	if (ret == 0)
 		try_to_unuse(type, true, pages_to_unuse);
 	return;
 }
-- 
1.7.3

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