tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 856deb866d16e29bd65952e0289066f6078af773 commit: 80591e61a0f7e88deaada69844e4a31280c4a38f kbuild: tell sparse about the $ARCH date: 10 months ago config: alpha-randconfig-s031-20200914 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-191-g10164920-dirty git checkout 80591e61a0f7e88deaada69844e4a31280c4a38f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=alpha 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 >>) drivers/net/hamradio/dmascc.c:978:48: sparse: sparse: non size-preserving pointer to integer cast drivers/net/hamradio/dmascc.c:1025:48: sparse: sparse: non size-preserving pointer to integer cast drivers/net/hamradio/dmascc.c:1025:48: sparse: sparse: non size-preserving pointer to integer cast # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 80591e61a0f7e88deaada69844e4a31280c4a38f vim +1238 drivers/net/hamradio/dmascc.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 1180 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1181 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1182 static void special_condition(struct scc_priv *priv, int rc) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1183 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1184 int cb; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1185 unsigned long flags; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1186 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1187 /* See Figure 2-15. Only overrun and EOF need to be checked. */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1188 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1189 if (rc & Rx_OVR) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1190 /* Receiver overrun */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1191 priv->rx_over = 1; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1192 if (priv->param.dma < 0) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1193 write_scc(priv, R0, ERR_RES); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1194 } else if (rc & END_FR) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1195 /* End of frame. Get byte count */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1196 if (priv->param.dma >= 0) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1197 flags = claim_dma_lock(); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1198 cb = BUF_SIZE - get_dma_residue(priv->param.dma) - ^1da177e4c3f41 Linus Torvalds 2005-04-16 1199 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1200 release_dma_lock(flags); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1201 } else { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1202 cb = priv->rx_ptr - 2; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1203 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1204 if (priv->rx_over) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1205 /* We had an overrun */ 13c0582d91ab63 Stephen Hemminger 2009-01-09 1206 priv->dev->stats.rx_errors++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1207 if (priv->rx_over == 2) 13c0582d91ab63 Stephen Hemminger 2009-01-09 1208 priv->dev->stats.rx_length_errors++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1209 else 13c0582d91ab63 Stephen Hemminger 2009-01-09 1210 priv->dev->stats.rx_fifo_errors++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1211 priv->rx_over = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1212 } else if (rc & CRC_ERR) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1213 /* Count invalid CRC only if packet length >= minimum */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1214 if (cb >= 15) { 13c0582d91ab63 Stephen Hemminger 2009-01-09 1215 priv->dev->stats.rx_errors++; 13c0582d91ab63 Stephen Hemminger 2009-01-09 1216 priv->dev->stats.rx_crc_errors++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1217 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1218 } else { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1219 if (cb >= 15) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1220 if (priv->rx_count < NUM_RX_BUF - 1) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1221 /* Put good frame in FIFO */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1222 priv->rx_len[priv->rx_head] = cb; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1223 priv->rx_head = ^1da177e4c3f41 Linus Torvalds 2005-04-16 1224 (priv->rx_head + ^1da177e4c3f41 Linus Torvalds 2005-04-16 1225 1) % NUM_RX_BUF; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1226 priv->rx_count++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1227 schedule_work(&priv->rx_work); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1228 } else { 13c0582d91ab63 Stephen Hemminger 2009-01-09 1229 priv->dev->stats.rx_errors++; 13c0582d91ab63 Stephen Hemminger 2009-01-09 1230 priv->dev->stats.rx_over_errors++; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1231 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1232 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1233 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1234 /* Get ready for new frame */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1235 if (priv->param.dma >= 0) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1236 flags = claim_dma_lock(); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1237 set_dma_addr(priv->param.dma, ^1da177e4c3f41 Linus Torvalds 2005-04-16 @1238 (int) priv->rx_buf[priv->rx_head]); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1239 set_dma_count(priv->param.dma, BUF_SIZE); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1240 release_dma_lock(flags); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1241 } else { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1242 priv->rx_ptr = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1243 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1244 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1245 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1246 :::::: The code at line 1238 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org