This is a note to let you know that I've just added the patch titled libceph: use BUG() instead of BUG_ON(1) to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: libceph-use-bug-instead-of-bug_on-1.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d24cdcd3e40a6825135498e11c20c7976b9bf545 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann <arnd@xxxxxxxx> Date: Mon, 16 Jan 2017 12:06:09 +0100 Subject: libceph: use BUG() instead of BUG_ON(1) From: Arnd Bergmann <arnd@xxxxxxxx> commit d24cdcd3e40a6825135498e11c20c7976b9bf545 upstream. I ran into this compile warning, which is the result of BUG_ON(1) not always leading to the compiler treating the code path as unreachable: include/linux/ceph/osdmap.h: In function 'ceph_can_shift_osds': include/linux/ceph/osdmap.h:62:1: error: control reaches end of non-void function [-Werror=return-type] Using BUG() here avoids the warning. Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx> Cc: Heinrich Schuchardt <xypron.glpk@xxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- include/linux/ceph/osdmap.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/ceph/osdmap.h +++ b/include/linux/ceph/osdmap.h @@ -57,7 +57,7 @@ static inline bool ceph_can_shift_osds(s case CEPH_POOL_TYPE_EC: return false; default: - BUG_ON(1); + BUG(); } } Patches currently in stable-queue which might be from arnd@xxxxxxxx are queue-4.9/libceph-use-bug-instead-of-bug_on-1.patch