[kbuild-all] Re: [usb:usb-testing 54/97] drivers/usb/isp1760/isp1760-hcd.c:735:2: warning: Value stored to 'scratch' is never read [clang-analyzer-deadcode.DeadStores]

Hi, On Wed Aug 18, 2021 at 11:09 PM WEST, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing > head: e4788edc730a0d2b26e1ae1f08fbb3f635b92dbb > commit: 7de14c88272c05d86fce83a5cead36832ce3a424 [54/97] usb: isp1760: remove debug message as error > config: riscv-randconfig-c006-20210818 (attached as .config) > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d2b574a4dea5b718e4386bf2e26af0126e5978ce) > 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 > # install riscv cross compiling tool for clang build > # apt-get install binutils-riscv64-linux-gnu > # https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/commit/?id... > git remote add usb https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git > git fetch --no-tags usb usb-testing > git checkout 7de14c88272c05d86fce83a5cead36832ce3a424 > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > > clang-analyzer warnings: (new ones prefixed by >>) > ^ ~ > drivers/target/target_core_configfs.c:2627:23: warning: Value stored to 'alua_lu_gp_cg' during its initialization is never read [clang-analyzer-deadcode.DeadStores] > struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group; > ^~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:2627:23: note: Value stored to 'alua_lu_gp_cg' during its initialization is never read > struct config_group *alua_lu_gp_cg = &lu_gp->lu_gp_group; > ^~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:2731:2: warning: Value stored to 'alua_lu_gp_ci' is never read [clang-analyzer-deadcode.DeadStores] > alua_lu_gp_ci = &alua_lu_gp_cg->cg_item; > ^ ~~~~~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:2731:2: note: Value stored to 'alua_lu_gp_ci' is never read > alua_lu_gp_ci = &alua_lu_gp_cg->cg_item; > ^ ~~~~~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:2748:25: warning: Value stored to 'lu_gp' during its initialization is never read [clang-analyzer-deadcode.DeadStores] > struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item), > ^~~~~ > drivers/target/target_core_configfs.c:2748:25: note: Value stored to 'lu_gp' during its initialization is never read > struct t10_alua_lu_gp *lu_gp = container_of(to_config_group(item), > ^~~~~ > drivers/target/target_core_configfs.c:3026:23: warning: Value stored to 'alua_tg_pt_gp_cg' during its initialization is never read [clang-analyzer-deadcode.DeadStores] > struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group; > ^~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:3026:23: note: Value stored to 'alua_tg_pt_gp_cg' during its initialization is never read > struct config_group *alua_tg_pt_gp_cg = &tg_pt_gp->tg_pt_gp_group; > ^~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:3163:2: warning: Value stored to 'alua_tg_pt_gp_ci' is never read [clang-analyzer-deadcode.DeadStores] > alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item; > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:3163:2: note: Value stored to 'alua_tg_pt_gp_ci' is never read > alua_tg_pt_gp_ci = &alua_tg_pt_gp_cg->cg_item; > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/target/target_core_configfs.c:3179:28: warning: Value stored to 'tg_pt_gp' during its initialization is never read [clang-analyzer-deadcode.DeadStores] > struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item), > ^~~~~~~~ > drivers/target/target_core_configfs.c:3179:28: note: Value stored to 'tg_pt_gp' during its initialization is never read > struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(to_config_group(item), > ^~~~~~~~ > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 6 warnings generated. > drivers/misc/eeprom/at24.c:334:2: warning: Value stored to 'client' is never read [clang-analyzer-deadcode.DeadStores] > client = at24_client->client; > ^ ~~~~~~~~~~~~~~~~~~~ > drivers/misc/eeprom/at24.c:334:2: note: Value stored to 'client' is never read > client = at24_client->client; > ^ ~~~~~~~~~~~~~~~~~~~ > drivers/misc/eeprom/at24.c:397:2: warning: Value stored to 'client' is never read [clang-analyzer-deadcode.DeadStores] > client = at24_client->client; > ^ ~~~~~~~~~~~~~~~~~~~ > drivers/misc/eeprom/at24.c:397:2: note: Value stored to 'client' is never read > client = at24_client->client; > ^ ~~~~~~~~~~~~~~~~~~~ > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 5 warnings generated. > drivers/usb/isp1760/isp1760-core.c:490:2: warning: Value stored to 'udc_enabled' is never read [clang-analyzer-deadcode.DeadStores] > udc_enabled = ((devflags & ISP1760_FLAG_ISP1763) || > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > drivers/usb/isp1760/isp1760-core.c:490:2: note: Value stored to 'udc_enabled' is never read > udc_enabled = ((devflags & ISP1760_FLAG_ISP1763) || > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 4 warnings generated. > Suppressed 4 warnings (4 in non-user code). > Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. > 9 warnings generated. > >> drivers/usb/isp1760/isp1760-hcd.c:735:2: warning: Value stored to 'scratch' is never read [clang-analyzer-deadcode.DeadStores] > scratch = isp1760_hcd_read(hcd, HC_CHIP_ID_HIGH); > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ yeah, this is desired behaviour, this read is only to make sure that we make something different than the pattern to test go over the bus. However I will take a look to this warning and other clang warnings that I am seeing in this report.