[PATCH] mm/zswap.c: add BUG() for default case in zswap_writeback_entry()

[Chen Gang]

Recommend to add default case to avoid compiler's warning, although at
present, the original implementation is still correct.

The related warning (with allmodconfig for metag):

    CC      mm/zswap.o
  mm/zswap.c: In function 'zswap_writeback_entry':
  mm/zswap.c:537: warning: 'ret' may be used uninitialized in this function


Signed-off-by: Chen Gang <gang.chen.5i5j@xxxxxxxxx>
---
 mm/zswap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 5a63f78..bfd1807 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -585,6 +585,8 @@ static int zswap_writeback_entry(struct zbud_pool *pool, unsigned long handle)
 
 		/* page is up to date */
 		SetPageUptodate(page);
+	default:
+		BUG();
 	}
 
 	/* move it to the tail of the inactive list after end_writeback */
-- 
1.7.7.6
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