tree: https://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git net-next-mlx5 head: e62d498381ea0759db87eae9a0d7ef9069959f5e commit: c29361b902ee230b93b69f205b2964c73088f82c [34/42] net/mlx5: DR, Handle ICM memory via buddy allocation instead of bucket management config: powerpc-randconfig-r022-20200918 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0ff28fa6a75617d61b1aeea77463d6a1684c3c89) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu git checkout c29361b902ee230b93b69f205b2964c73088f82c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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 >>): if (ret) ^~~ drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c:406:9: note: uninitialized use occurs here return chunk; ^~~~~ drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c:393:2: note: remove the 'if' if its condition is always false if (ret) ^~~~~~~~ drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c:383:32: note: initialize the variable 'chunk' to silence this warning struct mlx5dr_icm_chunk *chunk; ^ = NULL 1 warning generated. # https://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git/commit/?i... git remote add saeed https://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git git fetch --no-tags saeed net-next-mlx5 git checkout c29361b902ee230b93b69f205b2964c73088f82c vim +393 drivers/net/ethernet/mellanox/mlx5/core/steering/dr_icm_pool.c 374 375 /* Allocate an ICM chunk, each chunk holds a piece of ICM memory and 376 * also memory used for HW STE management for optimizations. 377 */ 378 struct mlx5dr_icm_chunk * 379 mlx5dr_icm_alloc_chunk(struct mlx5dr_icm_pool *pool, 380 enum mlx5dr_icm_chunk_size chunk_size) 381 { 382 struct mlx5dr_icm_buddy_mem *buddy; 383 struct mlx5dr_icm_chunk *chunk; 384 unsigned int seg; 385 int ret; 386 387 if (chunk_size > pool->max_log_chunk_sz) 388 return NULL; 389 390 mutex_lock(&pool->mutex); 391 /* find mem, get back the relevant buddy pool and seg in that mem */ 392 ret = dr_icm_handle_buddies_get_mem(pool, chunk_size, &buddy, &seg); 394 goto out; 395 396 chunk = dr_icm_chunk_create(pool, chunk_size, buddy, seg); 397 if (!chunk) 398 goto out_err; 399 400 goto out; 401 402 out_err: 403 mlx5dr_buddy_free_mem(buddy, seg, chunk_size); 404 out: 405 mutex_unlock(&pool->mutex); 406 return chunk; 407 } 408 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org