From 857c4c0a8b2888d806f4308c58f59a6a81a1dee9 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 13 Nov 2020 14:52:28 -0800
Subject: [PATCH] dm writecache: remove BUG() and fail gracefully instead
Git-commit: 857c4c0a8b2888d806f4308c58f59a6a81a1dee9
Patch-mainline: v5.10-rc7
References: git-fixes

Building on arch/s390/ results in this build error:

Cc1: some warnings being treated as errors
../drivers/md/dm-writecache.c: In function 'persistent_memory_claim':
../drivers/md/dm-writecache.c:323:1: error: no return statement in function returning non-void [-Werror=return-type]

Fix this by replacing the BUG() with an -EOPNOTSUPP return.

Fixes: 48debafe4f2f ("dm: add writecache target")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 drivers/md/dm-writecache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 7d277de26b3a..d5223a0e5cc5 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -319,7 +319,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
 #else
 static int persistent_memory_claim(struct dm_writecache *wc)
 {
-	BUG();
+	return -EOPNOTSUPP;
 }
 #endif
 
-- 
2.31.1