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Message-ID: <202412070931.gIXUE178-lkp@intel.com> Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Wei Yang CC: Andrew Morton CC: Linux Memory Management List tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f3ddc438a29f78f0642bfcf84407c236a0b2bdc7 commit: 2932fb0a927d30690b8cb70c71d511fd9054bb61 list: leverage list_is_head() for list_entry_is_head() date: 10 months ago :::::: branch date: 4 hours ago :::::: commit date: 10 months ago config: openrisc-randconfig-r072-20241206 (https://download.01.org/0day-ci/archive/20241207/202412070931.gIXUE178-lkp@intel.com/config) compiler: or1k-linux-gcc (GCC) 14.2.0 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202412070931.gIXUE178-lkp@intel.com/ smatch warnings: drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c:366 mlx5_devcom_get_next_peer_data() error: uninitialized symbol 'data'. drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c:395 mlx5_devcom_get_next_peer_data_rcu() error: uninitialized symbol 'data'. vim +/data +366 drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c 691c041bf20899f Vlad Buslov 2023-03-31 344 88d162b479815f5 Roi Dayan 2023-05-04 345 void *mlx5_devcom_get_next_peer_data(struct mlx5_devcom_comp_dev *devcom, 88d162b479815f5 Roi Dayan 2023-05-04 346 struct mlx5_devcom_comp_dev **pos) 691c041bf20899f Vlad Buslov 2023-03-31 347 { 88d162b479815f5 Roi Dayan 2023-05-04 348 struct mlx5_devcom_comp *comp = devcom->comp; 88d162b479815f5 Roi Dayan 2023-05-04 349 struct mlx5_devcom_comp_dev *tmp; 88d162b479815f5 Roi Dayan 2023-05-04 350 void *data; 691c041bf20899f Vlad Buslov 2023-03-31 351 88d162b479815f5 Roi Dayan 2023-05-04 352 tmp = list_prepare_entry(*pos, &comp->comp_dev_list_head, list); 691c041bf20899f Vlad Buslov 2023-03-31 353 88d162b479815f5 Roi Dayan 2023-05-04 354 list_for_each_entry_continue(tmp, &comp->comp_dev_list_head, list) { 88d162b479815f5 Roi Dayan 2023-05-04 355 if (tmp != devcom) { 88d162b479815f5 Roi Dayan 2023-05-04 356 data = rcu_dereference_protected(tmp->data, lockdep_is_held(&comp->sem)); 88d162b479815f5 Roi Dayan 2023-05-04 357 if (data) 691c041bf20899f Vlad Buslov 2023-03-31 358 break; 90ca127c62e9963 Saeed Mahameed 2023-06-02 359 } 90ca127c62e9963 Saeed Mahameed 2023-06-02 360 } 90ca127c62e9963 Saeed Mahameed 2023-06-02 361 88d162b479815f5 Roi Dayan 2023-05-04 362 if (list_entry_is_head(tmp, &comp->comp_dev_list_head, list)) 90ca127c62e9963 Saeed Mahameed 2023-06-02 363 return NULL; 90ca127c62e9963 Saeed Mahameed 2023-06-02 364 88d162b479815f5 Roi Dayan 2023-05-04 365 *pos = tmp; 88d162b479815f5 Roi Dayan 2023-05-04 @366 return data; 90ca127c62e9963 Saeed Mahameed 2023-06-02 367 } 90ca127c62e9963 Saeed Mahameed 2023-06-02 368 88d162b479815f5 Roi Dayan 2023-05-04 369 void *mlx5_devcom_get_next_peer_data_rcu(struct mlx5_devcom_comp_dev *devcom, 88d162b479815f5 Roi Dayan 2023-05-04 370 struct mlx5_devcom_comp_dev **pos) 90ca127c62e9963 Saeed Mahameed 2023-06-02 371 { 88d162b479815f5 Roi Dayan 2023-05-04 372 struct mlx5_devcom_comp *comp = devcom->comp; 88d162b479815f5 Roi Dayan 2023-05-04 373 struct mlx5_devcom_comp_dev *tmp; 88d162b479815f5 Roi Dayan 2023-05-04 374 void *data; 691c041bf20899f Vlad Buslov 2023-03-31 375 88d162b479815f5 Roi Dayan 2023-05-04 376 tmp = list_prepare_entry(*pos, &comp->comp_dev_list_head, list); 90ca127c62e9963 Saeed Mahameed 2023-06-02 377 88d162b479815f5 Roi Dayan 2023-05-04 378 list_for_each_entry_continue(tmp, &comp->comp_dev_list_head, list) { 88d162b479815f5 Roi Dayan 2023-05-04 379 if (tmp != devcom) { 691c041bf20899f Vlad Buslov 2023-03-31 380 /* This can change concurrently, however 'data' pointer will remain 691c041bf20899f Vlad Buslov 2023-03-31 381 * valid for the duration of RCU read section. 691c041bf20899f Vlad Buslov 2023-03-31 382 */ e67f928a5204cc5 Shay Drory 2023-02-07 383 if (!READ_ONCE(comp->ready)) 691c041bf20899f Vlad Buslov 2023-03-31 384 return NULL; 88d162b479815f5 Roi Dayan 2023-05-04 385 data = rcu_dereference(tmp->data); 88d162b479815f5 Roi Dayan 2023-05-04 386 if (data) 90ca127c62e9963 Saeed Mahameed 2023-06-02 387 break; 90ca127c62e9963 Saeed Mahameed 2023-06-02 388 } fadd59fc50d0101 Aviv Heller 2018-12-04 389 } fadd59fc50d0101 Aviv Heller 2018-12-04 390 88d162b479815f5 Roi Dayan 2023-05-04 391 if (list_entry_is_head(tmp, &comp->comp_dev_list_head, list)) 90ca127c62e9963 Saeed Mahameed 2023-06-02 392 return NULL; fadd59fc50d0101 Aviv Heller 2018-12-04 393 88d162b479815f5 Roi Dayan 2023-05-04 394 *pos = tmp; 88d162b479815f5 Roi Dayan 2023-05-04 @395 return data; fadd59fc50d0101 Aviv Heller 2018-12-04 396 } e534552c92a4469 Shay Drory 2023-10-12 397 :::::: The code at line 366 was first introduced by commit :::::: 88d162b479815f5d6b6a4ff5fdb07aec9dc6280c net/mlx5: Devcom, Infrastructure changes :::::: TO: Roi Dayan :::::: CC: Saeed Mahameed -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki