[RFC 01/11] mm: use SWAP_SUCCESS instead of 0

From: Minchan Kim <minchan@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: kernel-team@lge.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@suse.com>, Minchan Kim <minchan@kernel.org>,
	"Kirill A . Shutemov" <kirill@shutemov.name>
Subject: [RFC 01/11] mm: use SWAP_SUCCESS instead of 0
Date: Thu,  2 Mar 2017 15:39:15 +0900	[thread overview]
Message-ID: <1488436765-32350-2-git-send-email-minchan@kernel.org> (raw)
In-Reply-To: <1488436765-32350-1-git-send-email-minchan@kernel.org>

SWAP_SUCCESS defined value 0 can be changed always so don't rely on
it. Instead, use explict macro.

Cc: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 mm/huge_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 092cc5c..fe2ccd4 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2114,7 +2114,7 @@ static void freeze_page(struct page *page)
 		ttu_flags |= TTU_MIGRATION;
 
 	ret = try_to_unmap(page, ttu_flags);
-	VM_BUG_ON_PAGE(ret, page);
+	VM_BUG_ON_PAGE(ret != SWAP_SUCCESS, page);
 }
 
 static void unfreeze_page(struct page *page)
-- 
2.7.4
