Hi Mete, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.15-rc6 next-20211021] [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] url: https://github.com/0day-ci/linux/commits/Mete-Polat/rbtree-Test-against-a... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 519d81956ee277b4419c723adfb154603c2565ba config: nds32-randconfig-r032-20211019 (attached as .config) compiler: nds32le-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 # https://github.com/0day-ci/linux/commit/d73723d42ad47ca335de00e899a9e94b0... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mete-Polat/rbtree-Test-against-a-verified-oracle/20211019-171711 git checkout d73723d42ad47ca335de00e899a9e94b03d8b57d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=nds32 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 >>): 91 | ssize_t cmd_exec(struct file *file, const char __user *ubuf, size_t len, loff_t *offp) | ^~~~~~~~ 138 | int __init rbt_if_init(void) | ^~~~~~~~~~~ 149 | void __exit rbt_if_exit(void) | ^~~~~~~~~~~ vim +/cmd_exec +91 lib/test_rbtree_interface.c 90 92 { 93 int cmd; 94 struct data *data, *_n; 95 struct rb_node *node; 96 int ret = kstrtoint_from_user(ubuf, len, 10, &cmd); 97 if (ret) 98 return ret; 99 100 switch (cmd) { 101 case RESET: 102 rbtree_postorder_for_each_entry_safe(data, _n, &rbt, node) 103 kfree(data); 104 rbt = RB_ROOT; 105 break; 106 case INSERT: 107 data = kzalloc(sizeof(*data), GFP_KERNEL); 108 data->key = input_key; 109 rb_find_add(&data->node, &rbt, node_cmp); 110 break; 111 case DELETE: 112 node = rb_find(&input_key, &rbt, key_cmp); 113 if (!node) 114 break; 115 rb_erase(node, &rbt); 116 kfree(data_from_node(node)); 117 break; 118 default: 119 return -EINVAL; 120 } 121 return len; 122 } 123 124 static int cmd_open(struct inode *inode, struct file *file) 125 { 126 return single_open(file, cmd_show, inode->i_private); 127 } 128 129 static const struct file_operations cmd_fops = { 130 .owner = THIS_MODULE, 131 .open = cmd_open, 132 .read = seq_read, 133 .write = cmd_exec, 134 .llseek = seq_lseek, 135 .release = single_release, 136 }; 137 139 { 140 rbt_if_root = debugfs_create_dir("rbt_if", NULL); 141 if (IS_ERR(rbt_if_root)) 142 return PTR_ERR(rbt_if_root); 143 144 debugfs_create_file("cmd", 0644, rbt_if_root, NULL, &cmd_fops); 145 debugfs_create_u64("key", 0644, rbt_if_root, &input_key); 146 return 0; 147 } 148 150 { 151 struct data *_n, *pos; 152 debugfs_remove_recursive(rbt_if_root); 153 rbtree_postorder_for_each_entry_safe(pos, _n, &rbt, node) 154 kfree(pos); 155 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org