Building on arch/s390/ flags this as an error, so add the __noreturn attribute modifier to prevent the 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] Fixes: 48debafe4f2f ("dm: add writecache target") Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Cc: Mikulas Patocka <mpatocka@xxxxxxxxxx> Cc: Alasdair Kergon <agk@xxxxxxxxxx> Cc: Mike Snitzer <snitzer@xxxxxxxxxx> Cc: dm-devel@xxxxxxxxxx Cc: Heiko Carstens <hca@xxxxxxxxxxxxx> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx> Cc: linux-s390@xxxxxxxxxxxxxxx --- drivers/md/dm-writecache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- linux-next-20201113.orig/drivers/md/dm-writecache.c +++ linux-next-20201113/drivers/md/dm-writecache.c @@ -317,7 +317,7 @@ err1: return r; } #else -static int persistent_memory_claim(struct dm_writecache *wc) +static int __noreturn persistent_memory_claim(struct dm_writecache *wc) { BUG(); }