Hi Hans, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on rdma/for-next] [also build test WARNING on linus/master v5.12-rc7 next-20210414] [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/Hans-Westgaard-Ry/net-mlx4-Treat... base: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next 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/9de686423c117ccefb2c09e57ab16f84f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Hans-Westgaard-Ry/net-mlx4-Treat-VFs-fair-when-handling-comm_channel_events/20210415-194619 git checkout 9de686423c117ccefb2c09e57ab16f84f0434c68 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arc 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 >>): drivers/net/ethernet/mellanox/mlx4/cmd.c: In function 'mlx4_master_comm_channel': 2251 | u32 prev_slave; | ^~~~~~~~~~ vim +/prev_slave +2251 drivers/net/ethernet/mellanox/mlx4/cmd.c 2230 2231 /* master command processing */ 2232 void mlx4_master_comm_channel(struct work_struct *work) 2233 { 2234 struct mlx4_mfunc_master_ctx *master = 2235 container_of(work, 2236 struct mlx4_mfunc_master_ctx, 2237 comm_work); 2238 struct mlx4_mfunc *mfunc = 2239 container_of(master, struct mlx4_mfunc, master); 2240 struct mlx4_priv *priv = 2241 container_of(mfunc, struct mlx4_priv, mfunc); 2242 struct mlx4_dev *dev = &priv->dev; 2243 u32 comm_cmd; 2244 int i, slave; 2245 int toggle; 2246 int served = 0; 2247 int reported = 0; 2248 u32 slt; 2249 u32 lbit_vec[COMM_CHANNEL_BIT_ARRAY_SIZE]; 2250 u32 nmbr_bits; 2252 bool first = true; 2253 2254 for (i = 0; i < COMM_CHANNEL_BIT_ARRAY_SIZE; i++) 2255 lbit_vec[i] = be32_to_cpu(master->comm_arm_bit_vector[i]); 2256 nmbr_bits = dev->persist->num_vfs + 1; 2257 if (++priv->next_slave >= nmbr_bits) 2258 priv->next_slave = 0; 2259 slave = priv->next_slave; 2260 while (true) { 2261 slave = find_next_bit((const unsigned long *)&lbit_vec, nmbr_bits, slave); 2262 if (!first && slave >= priv->next_slave) { 2263 break; 2264 } else if (slave == nmbr_bits) { 2265 if (!first) 2266 break; 2267 first = false; 2268 slave = 0; 2269 continue; 2270 } 2271 ++reported; 2272 comm_cmd = swab32(readl(&mfunc->comm[slave].slave_write)); 2273 slt = swab32(readl(&mfunc->comm[slave].slave_read)) >> 31; 2274 toggle = comm_cmd >> 31; 2275 if (toggle != slt) { 2276 if (master->slave_state[slave].comm_toggle 2277 != slt) { 2278 pr_info("slave %d out of sync. read toggle %d, state toggle %d. Resynching.\n", 2279 slave, slt, 2280 master->slave_state[slave].comm_toggle); 2281 master->slave_state[slave].comm_toggle = 2282 slt; 2283 } 2284 mlx4_master_do_cmd(dev, slave, 2285 comm_cmd >> 16 & 0xff, 2286 comm_cmd & 0xffff, toggle); 2287 ++served; 2288 } 2289 prev_slave = slave++; 2290 } 2291 2292 if (reported && reported != served) 2293 mlx4_warn(dev, "Got command event with bitmask from %d slaves but %d were served %x %d\n", 2294 reported, served, lbit_vec[0], priv->next_slave); 2295 2296 if (mlx4_ARM_COMM_CHANNEL(dev)) 2297 mlx4_warn(dev, "Failed to arm comm channel events\n"); 2298 } 2299 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org