Hi Xidong, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mmotm/master] [also build test WARNING on v4.16 next-20180405] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Xidong-Wang/z3fold-fix-memory-leak/20180404-114952 base: git://git.cmpxchg.org/linux-mmotm.git master smatch warnings: mm/z3fold.c:493 z3fold_create_pool() error: potential null dereference 'pool'. (kzalloc returns null) mm/z3fold.c:493 z3fold_create_pool() error: we previously assumed 'pool' could be null (see line 465) vim +/pool +493 mm/z3fold.c 443 444 445 /* 446 * API Functions 447 */ 448 449 /** 450 * z3fold_create_pool() - create a new z3fold pool 451 * @name: pool name 452 * @gfp: gfp flags when allocating the z3fold pool structure 453 * @ops: user-defined operations for the z3fold pool 454 * 455 * Return: pointer to the new z3fold pool or NULL if the metadata allocation 456 * failed. 457 */ 458 static struct z3fold_pool *z3fold_create_pool(const char *name, gfp_t gfp, 459 const struct z3fold_ops *ops) 460 { 461 struct z3fold_pool *pool = NULL; 462 int i, cpu; 463 464 pool = kzalloc(sizeof(struct z3fold_pool), gfp); > 465 if (!pool) 466 goto out; 467 spin_lock_init(&pool->lock); 468 spin_lock_init(&pool->stale_lock); 469 pool->unbuddied = __alloc_percpu(sizeof(struct list_head)*NCHUNKS, 2); 470 for_each_possible_cpu(cpu) { 471 struct list_head *unbuddied = 472 per_cpu_ptr(pool->unbuddied, cpu); 473 for_each_unbuddied_list(i, 0) 474 INIT_LIST_HEAD(&unbuddied[i]); 475 } 476 INIT_LIST_HEAD(&pool->lru); 477 INIT_LIST_HEAD(&pool->stale); 478 atomic64_set(&pool->pages_nr, 0); 479 pool->name = name; 480 pool->compact_wq = create_singlethread_workqueue(pool->name); 481 if (!pool->compact_wq) 482 goto out; 483 pool->release_wq = create_singlethread_workqueue(pool->name); 484 if (!pool->release_wq) 485 goto out_wq; 486 INIT_WORK(&pool->work, free_pages_work); 487 pool->ops = ops; 488 return pool; 489 490 out_wq: 491 destroy_workqueue(pool->compact_wq); 492 out: > 493 free_percpu(pool->unbuddied); 494 kfree(pool); 495 return NULL; 496 } 497 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
