Hi Anuj,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on axboe-block/for-next]
[also build test WARNING on next-20220929]
[cannot apply to mkp-scsi/for-next jejb-scsi/for-next linus/master v6.0-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Anuj-Gupta/io_uring-add-io_uring_cmd_import_fixed/20220929-210700
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: x86_64-randconfig-a005
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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
        # https://github.com/intel-lab-lkp/linux/commit/68e5d069227ee13ab1d6cd51a78f83d12db14608
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Anuj-Gupta/io_uring-add-io_uring_cmd_import_fixed/20220929-210700
        git checkout 68e5d069227ee13ab1d6cd51a78f83d12db14608
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> block/blk-map.c:720:13: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           } else if (buf_len) {
                      ^~~~~~~
   block/blk-map.c:724:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   block/blk-map.c:720:9: note: remove the 'if' if its condition is always true
           } else if (buf_len) {
                  ^~~~~~~~~~~~~
   block/blk-map.c:696:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +720 block/blk-map.c

   691	
   692	int blk_rq_map_user_io(struct request *req, struct rq_map_data *map_data,
   693			void __user *ubuf, unsigned long buf_len, gfp_t gfp_mask,
   694			bool vec, int iov_count, bool check_iter_count, int rw)
   695	{
   696		int ret;
   697	
   698		if (vec) {
   699			struct iovec fast_iov[UIO_FASTIOV];
   700			struct iovec *iov = fast_iov;
   701			struct iov_iter iter;
   702	
   703			ret = import_iovec(rw, ubuf, iov_count ? iov_count : buf_len,
   704					UIO_FASTIOV, &iov, &iter);
   705			if (ret < 0)
   706				return ret;
   707	
   708			if (iov_count) {
   709				/* SG_IO howto says that the shorter of the two wins */
   710				iov_iter_truncate(&iter, buf_len);
   711				if (check_iter_count && !iov_iter_count(&iter)) {
   712					kfree(iov);
   713					return -EINVAL;
   714				}
   715			}
   716	
   717			ret = blk_rq_map_user_iov(req->q, req, map_data, &iter,
   718					gfp_mask);
   719			kfree(iov);
 > 720		} else if (buf_len) {
   721			ret = blk_rq_map_user(req->q, req, map_data, ubuf, buf_len,
   722					gfp_mask);
   723		}
   724		return ret;
   725	}
   726	EXPORT_SYMBOL(blk_rq_map_user_io);
   727	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp