Hi Quan, I love your patch! Yet something to improve: [auto build test ERROR on char-misc/char-misc-testing] [also build test ERROR on wsa/i2c/for-next ipmi/for-next v5.14-rc1 next-20210713] [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/Quan-Nguyen/Add-SSIF-BMC-driver/... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 77d34a4683b053108ecd466cc7c4193b45805528 config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 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/cf593040967f887f9c4957726fcdccc8f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Quan-Nguyen/Add-SSIF-BMC-driver/20210713-135600 git checkout cf593040967f887f9c4957726fcdccc8fbaa6f9e # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-review/Quan-Nguyen/Add-SSIF-BMC-driver/20210713-135600 HEAD 92b8df8e5b040f3d832db695bc204463986f7fcd builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): drivers/char/ipmi/ssif_bmc.c: In function 'ssif_bmc_write': 111 | if (ssif_bmc->client->adapter->algo->slave_enable) | ^~ drivers/char/ipmi/ssif_bmc.c:112:40: error: 'const struct i2c_algorithm' has no member named 'slave_enable' 112 | ret = ssif_bmc->client->adapter->algo->slave_enable(ssif_bmc->client, true); | ^~ drivers/char/ipmi/ssif_bmc.c: In function 'handle_request': drivers/char/ipmi/ssif_bmc.c:188:37: error: 'const struct i2c_algorithm' has no member named 'slave_enable' 188 | if (ssif_bmc->client->adapter->algo->slave_enable) | ^~ drivers/char/ipmi/ssif_bmc.c:189:34: error: 'const struct i2c_algorithm' has no member named 'slave_enable' 189 | ssif_bmc->client->adapter->algo->slave_enable(ssif_bmc->client, false); | ^~ vim +111 drivers/char/ipmi/ssif_bmc.c 75 76 /* Handle SSIF message that is written by user */ 77 static ssize_t ssif_bmc_write(struct file *file, const char __user *buf, size_t count, 78 loff_t *ppos) 79 { 80 struct ssif_bmc_ctx *ssif_bmc = to_ssif_bmc(file); 81 struct ssif_msg msg; 82 unsigned long flags; 83 ssize_t ret; 84 85 if (count > sizeof(struct ssif_msg)) 86 return -EINVAL; 87 88 ret = copy_from_user(&msg, buf, count); 89 if (ret) 90 return ret; 91 92 if (!msg.len || count < ssif_msg_len(&msg)) 93 return -EINVAL; 94 95 spin_lock_irqsave(&ssif_bmc->lock, flags); 96 while (ssif_bmc->response_in_progress) { 97 spin_unlock_irqrestore(&ssif_bmc->lock, flags); 98 if (file->f_flags & O_NONBLOCK) 99 return -EAGAIN; 100 ret = wait_event_interruptible(ssif_bmc->wait_queue, 101 !ssif_bmc->response_in_progress); 102 if (ret) 103 return ret; 104 spin_lock_irqsave(&ssif_bmc->lock, flags); 105 } 106 107 memcpy(&ssif_bmc->response, &msg, count); 108 ssif_bmc->is_singlepart_read = (ssif_msg_len(&msg) <= MAX_PAYLOAD_PER_TRANSACTION + 1); 109 ssif_bmc->response_in_progress = true; 110 112 ret = ssif_bmc->client->adapter->algo->slave_enable(ssif_bmc->client, true); 113 114 spin_unlock_irqrestore(&ssif_bmc->lock, flags); 115 116 return (ret < 0) ? ret : count; 117 } 118 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org