tree: https://git.kernel.org/pub/scm/linux/kernel/git/rw/misc.git muse_v1 head: d1901f3da6f0b1e1448f26c782f8da52150bc187 commit: d1901f3da6f0b1e1448f26c782f8da52150bc187 [5/5] fuse: Implement MUSE: MTD in userspace config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/rw/misc.git/commit/?id=d1... git remote add rw https://git.kernel.org/pub/scm/linux/kernel/git/rw/misc.git git fetch --no-tags rw muse_v1 git checkout d1901f3da6f0b1e1448f26c782f8da52150bc187 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): fs/fuse/muse.c: In function 'muse_mtd_read': 113 | int ret; | ^~~ fs/fuse/muse.c: In function 'muse_mtd_write': fs/fuse/muse.c:132:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] 132 | int ret; | ^~~ vim +/ret +113 fs/fuse/muse.c 104 105 static int muse_mtd_read(struct mtd_info *mtd, loff_t from, size_t len, 106 size_t *retlen, u_char *buf) 107 { 108 struct kvec iov = { .iov_base = buf, .iov_len = len }; 109 struct muse_conn *mc = mtd->priv; 110 struct kiocb kiocb; 111 struct iov_iter to; 112 loff_t pos = from; 114 115 iov_iter_kvec(&to, READ, &iov, 1, len); 116 init_sync_kiocb(&kiocb, mc->dummy_file); 117 118 ret = do_dio(&kiocb, &to, &pos, FUSE_DIO_NOFS); 119 120 *retlen = len; 121 return len; 122 } 123 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org