tree: https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git drivers/scmi head: 72a5eb9d9c319c99c11cfd9cfb486380dd136840 commit: dccec73de91de04f2a62c877411ecbe368a775f7 [15/20] firmware: arm_scmi: Keep the discrete clock rates sorted config: arm64-randconfig-s031-20200716 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout dccec73de91de04f2a62c877411ecbe368a775f7 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +142 drivers/firmware/arm_scmi/clock.c 137 138 static int 139 scmi_clock_describe_rates_get(const struct scmi_handle *handle, u32 clk_id, 140 struct scmi_clock_info *clk) 141 { 143 int ret, cnt; 144 bool rate_discrete = false; 145 u32 tot_rate_cnt = 0, rates_flag; 146 u16 num_returned, num_remaining; 147 struct scmi_xfer *t; 148 struct scmi_msg_clock_describe_rates *clk_desc; 149 struct scmi_msg_resp_clock_describe_rates *rlist; 150 151 ret = scmi_xfer_get_init(handle, CLOCK_DESCRIBE_RATES, 152 SCMI_PROTOCOL_CLOCK, sizeof(*clk_desc), 0, &t); 153 if (ret) 154 return ret; 155 156 clk_desc = t->tx.buf; 157 rlist = t->rx.buf; 158 159 do { 160 clk_desc->id = cpu_to_le32(clk_id); 161 /* Set the number of rates to be skipped/already read */ 162 clk_desc->rate_index = cpu_to_le32(tot_rate_cnt); 163 164 ret = scmi_do_xfer(handle, t); 165 if (ret) 166 goto err; 167 168 rates_flag = le32_to_cpu(rlist->num_rates_flags); 169 num_remaining = NUM_REMAINING(rates_flag); 170 rate_discrete = RATE_DISCRETE(rates_flag); 171 num_returned = NUM_RETURNED(rates_flag); 172 173 if (tot_rate_cnt + num_returned > SCMI_MAX_NUM_RATES) { 174 dev_err(handle->dev, "No. of rates > MAX_NUM_RATES"); 175 break; 176 } 177 178 if (!rate_discrete) { 179 clk->range.min_rate = RATE_TO_U64(rlist->rate[0]); 180 clk->range.max_rate = RATE_TO_U64(rlist->rate[1]); 181 clk->range.step_size = RATE_TO_U64(rlist->rate[2]); 182 dev_dbg(handle->dev, "Min %llu Max %llu Step %llu Hz\n", 183 clk->range.min_rate, clk->range.max_rate, 184 clk->range.step_size); 185 break; 186 } 187 188 rate = &clk->list.rates[tot_rate_cnt]; 189 for (cnt = 0; cnt < num_returned; cnt++, rate++) { 190 *rate = RATE_TO_U64(rlist->rate[cnt]); 191 dev_dbg(handle->dev, "Rate %llu Hz\n", *rate); 192 } 193 194 tot_rate_cnt += num_returned; 195 /* 196 * check for both returned and remaining to avoid infinite 197 * loop due to buggy firmware 198 */ 199 } while (num_returned && num_remaining); 200 201 if (rate_discrete && rate) { 202 clk->list.num_rates = tot_rate_cnt; 203 sort(rate, tot_rate_cnt, sizeof(*rate), rate_cmp_func, NULL); 204 } 205 206 clk->rate_discrete = rate_discrete; 207 208 err: 209 scmi_xfer_put(handle, t); 210 return ret; 211 } 212 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org