Hi Junhui, kernel test robot noticed the following build warnings: [auto build test WARNING on abf2050f51fdca0fd146388f83cddd95a57a008d] url: https://github.com/intel-lab-lkp/linux/commits/Junhui-Liu/dt-bindings-reset-Add-support-for-canaan-k230-rst/20240924-140732 base: abf2050f51fdca0fd146388f83cddd95a57a008d patch link: https://lore.kernel.org/r/20240924-k230-reset-v1-2-d0cdc11989eb%40outlook.com patch subject: [PATCH 2/2] reset: canaan: Add reset driver for Kendryte K230 config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20240925/202409250201.ZlZsYfH8-lkp@xxxxxxxxx/config) compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240925/202409250201.ZlZsYfH8-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202409250201.ZlZsYfH8-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from drivers/reset/reset-k230.c:8: In file included from include/linux/io.h:14: In file included from arch/hexagon/include/asm/io.h:328: include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 548 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 561 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ In file included from drivers/reset/reset-k230.c:8: In file included from include/linux/io.h:14: In file included from arch/hexagon/include/asm/io.h:328: include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 574 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) | ^ In file included from drivers/reset/reset-k230.c:8: In file included from include/linux/io.h:14: In file included from arch/hexagon/include/asm/io.h:328: include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 585 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 595 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 605 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ >> drivers/reset/reset-k230.c:223:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 223 | case RST_TYPE_SW_DONE: | ^~~~~~~~~~~~~~~~ drivers/reset/reset-k230.c:231:9: note: uninitialized use occurs here 231 | return ret; | ^~~ drivers/reset/reset-k230.c:214:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 214 | case RST_TYPE_CPU1: | ^~~~~~~~~~~~~ drivers/reset/reset-k230.c:231:9: note: uninitialized use occurs here 231 | return ret; | ^~~ drivers/reset/reset-k230.c:215:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 215 | case RST_TYPE_FLUSH: | ^~~~~~~~~~~~~~ drivers/reset/reset-k230.c:231:9: note: uninitialized use occurs here 231 | return ret; | ^~~ drivers/reset/reset-k230.c:206:9: note: initialize the variable 'ret' to silence this warning 206 | int ret; | ^ | = 0 drivers/reset/reset-k230.c:250:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 250 | case RST_TYPE_SW_DONE: | ^~~~~~~~~~~~~~~~ drivers/reset/reset-k230.c:258:9: note: uninitialized use occurs here 258 | return ret; | ^~~ drivers/reset/reset-k230.c:247:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 247 | case RST_TYPE_FLUSH: | ^~~~~~~~~~~~~~ drivers/reset/reset-k230.c:258:9: note: uninitialized use occurs here 258 | return ret; | ^~~ drivers/reset/reset-k230.c:248:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 248 | case RST_TYPE_HW_DONE: | ^~~~~~~~~~~~~~~~ drivers/reset/reset-k230.c:258:9: note: uninitialized use occurs here 258 | return ret; | ^~~ drivers/reset/reset-k230.c:241:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] 241 | case RST_TYPE_CPU0: | ^~~~~~~~~~~~~ drivers/reset/reset-k230.c:258:9: note: uninitialized use occurs here 258 | return ret; | ^~~ drivers/reset/reset-k230.c:238:9: note: initialize the variable 'ret' to silence this warning 238 | int ret; | ^ | = 0 13 warnings generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for GET_FREE_REGION Depends on [n]: SPARSEMEM [=n] Selected by [m]: - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m] vim +/ret +223 drivers/reset/reset-k230.c 201 202 static int k230_rst_assert(struct reset_controller_dev *rcdev, unsigned long id) 203 { 204 struct k230_rst *rstc = to_k230_rst(rcdev); 205 const struct k230_rst_map *rmap = &k230_resets[id]; 206 int ret; 207 208 switch (rmap->type) { 209 case RST_TYPE_CPU0: 210 k230_rst_clear_done(rstc, id, true); 211 k230_rst_update(rstc, id, true, true, false); 212 ret = k230_rst_wait_and_clear_done(rstc, id, true); 213 break; 214 case RST_TYPE_CPU1: 215 case RST_TYPE_FLUSH: 216 k230_rst_update(rstc, id, true, true, false); 217 break; 218 case RST_TYPE_HW_DONE: 219 k230_rst_clear_done(rstc, id, false); 220 k230_rst_update(rstc, id, true, false, false); 221 ret = k230_rst_wait_and_clear_done(rstc, id, false); 222 break; > 223 case RST_TYPE_SW_DONE: 224 k230_rst_update(rstc, id, true, false, 225 id == RST_SPI2AXI ? false : true); 226 break; 227 default: 228 return -EINVAL; 229 } 230 231 return ret; 232 } 233 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
