[kbuild-all] [hch-block:bio_alloc-cleanup 28/28] fs/btrfs/extent_io.c:3176:15: warning: 'bio' is used uninitialized

tree: git://git.infradead.org/users/hch/block.git bio_alloc-cleanup head: 6e74740a44aecf40f23fc9baa4fe7844e0543046 commit: 6e74740a44aecf40f23fc9baa4fe7844e0543046 [28/28] block: pass a block_device to bio_clone_fast config: arm64-randconfig-r015-20220113 (https://download.01.org/0day-ci/archive/20220114/202201140821.C6r5Z4QY-lk...) compiler: aarch64-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add hch-block git://git.infradead.org/users/hch/block.git git fetch --no-tags hch-block bio_alloc-cleanup git checkout 6e74740a44aecf40f23fc9baa4fe7844e0543046 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash fs/btrfs/ 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/btrfs/extent_io.c: In function 'btrfs_bio_clone_partial': 3176 | bio = bio_alloc_clone(bio->bi_bdev, orig, GFP_NOFS, &btrfs_bioset); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/bio +3176 fs/btrfs/extent_io.c 3167 3168 struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size) 3169 { 3170 struct bio *bio; 3171 struct btrfs_bio *bbio; 3172 3173 ASSERT(offset <= UINT_MAX && size <= UINT_MAX); 3174 3175 /* this will never fail when it's backed by a bioset */ 3177 ASSERT(bio); 3178 3179 bbio = btrfs_bio(bio); 3180 btrfs_bio_init(bbio); 3181 3182 bio_trim(bio, offset >> 9, size >> 9); 3183 bbio->iter = bio->bi_iter; 3184 return bio; 3185 } 3186 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org