CC: [email protected] CC: [email protected] CC: [email protected] TO: Jakub Jelinek <[email protected]> CC: "Peter Zijlstra (Intel)" <[email protected]> CC: Andrew Morton <[email protected]> CC: Linux Memory Management List <[email protected]>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d58071a8a76d779eedab38033ae4c821c30295a5 commit: 2f78788b55baa3410b1ec91a576286abe1ad4d6a ilog2: improve ilog2 for constant arguments date: 12 months ago :::::: branch date: 28 hours ago :::::: commit date: 12 months ago config: arm-randconfig-c002-20211124 (https://download.01.org/0day-ci/archive/20211130/[email protected]/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 67a1c45def8a75061203461ab0060c75c864df1c) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f78788b55baa3410b1ec91a576286abe1ad4d6a git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 2f78788b55baa3410b1ec91a576286abe1ad4d6a # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> clang-analyzer warnings: (new ones prefixed by >>) struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:277:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:298:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:298:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:391:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:391:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:406:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:406:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:415:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:415:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:426:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:426:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:440:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:440:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:470:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ drivers/media/tuners/fc2580.c:470:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = dev->client; ^~~~~~ ~~~~~~~~~~~ Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. 7 warnings generated. drivers/media/pci/saa7134/saa7134-cards.c:7742:3: warning: Value stored to 'tuner_t' is never read [clang-analyzer-deadcode.DeadStores] tuner_t = 0; ^ ~ drivers/media/pci/saa7134/saa7134-cards.c:7742:3: note: Value stored to 'tuner_t' is never read tuner_t = 0; ^ ~ Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. Suppressed 6 warnings (6 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. 10 warnings generated. drivers/media/pci/saa7134/saa7134-tvaudio.c:52:15: warning: Excessive padding in 'struct mainscan' (8 padding bytes, where 0 is optimal). Optimal fields order: std, name, carr, consider reordering the fields or adding explicit padding members [clang-analyzer-optin.performance.Padding] static struct mainscan { ~~~~~~~^~~~~~~~~~ drivers/media/pci/saa7134/saa7134-tvaudio.c:52:15: note: Excessive padding in 'struct mainscan' (8 padding bytes, where 0 is optimal). Optimal fields order: std, name, carr, consider reordering the fields or adding explicit padding members static struct mainscan { ~~~~~~~^~~~~~~~~~ >> drivers/media/pci/saa7134/saa7134-tvaudio.c:153:4: warning: Assigned value >> is garbage or undefined [clang-analyzer-core.uninitialized.Assign] a <<= 24; ^ drivers/media/pci/saa7134/saa7134-tvaudio.c:321:6: note: Assuming the condition is false if (!(dev->tvnorm->id & scan->std)) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/pci/saa7134/saa7134-tvaudio.c:321:2: note: Taking false branch if (!(dev->tvnorm->id & scan->std)) { ^ drivers/media/pci/saa7134/saa7134-tvaudio.c:327:6: note: Assuming 'audio_debug' is <= 1 if (audio_debug > 1) { ^~~~~~~~~~~~~~~ drivers/media/pci/saa7134/saa7134-tvaudio.c:327:2: note: Taking false branch if (audio_debug > 1) { ^ drivers/media/pci/saa7134/saa7134-tvaudio.c:344:2: note: Calling 'tvaudio_setcarrier' tvaudio_setcarrier(dev,scan->carr-90,scan->carr-90); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/pci/saa7134/saa7134-tvaudio.c:161:6: note: Assuming the condition is true if (-1 == secondary) ^~~~~~~~~~~~~~~ drivers/media/pci/saa7134/saa7134-tvaudio.c:161:2: note: Taking true branch if (-1 == secondary) ^ drivers/media/pci/saa7134/saa7134-tvaudio.c:163:2: note: Loop condition is false. Exiting loop saa_writel(SAA7134_CARRIER1_FREQ0 >> 2, tvaudio_carr2reg(primary)); ^ drivers/media/pci/saa7134/saa7134.h:691:36: note: expanded from macro 'saa_writel' #define saa_writel(reg,value) writel((value), dev->lmmio + (reg)); ^ arch/arm/include/asm/io.h:307:25: note: expanded from macro 'writel' #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) ^ arch/arm/include/asm/io.h:169:20: note: expanded from macro '__iowmb' #define __iowmb() do { } while (0) ^ drivers/media/pci/saa7134/saa7134-tvaudio.c:163:42: note: Calling 'tvaudio_carr2reg' saa_writel(SAA7134_CARRIER1_FREQ0 >> 2, tvaudio_carr2reg(primary)); ^ drivers/media/pci/saa7134/saa7134.h:691:44: note: expanded from macro 'saa_writel' #define saa_writel(reg,value) writel((value), dev->lmmio + (reg)); ^~~~~ arch/arm/include/asm/io.h:307:51: note: expanded from macro 'writel' #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) ^ arch/arm/include/asm/io.h:299:68: note: expanded from macro 'writel_relaxed' #define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c) ^ include/uapi/linux/byteorder/little_endian.h:33:51: note: expanded from macro '__cpu_to_le32' #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) ^ drivers/media/pci/saa7134/saa7134-tvaudio.c:153:4: note: Assigned value is garbage or undefined a <<= 24; ^ ~~ drivers/media/pci/saa7134/saa7134-tvaudio.c:494:3: warning: Value stored to 'max1' is never read [clang-analyzer-deadcode.DeadStores] max1 = 0; ^ ~ drivers/media/pci/saa7134/saa7134-tvaudio.c:494:3: note: Value stored to 'max1' is never read max1 = 0; ^ ~ Suppressed 7 warnings (7 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. 13 warnings generated. drivers/media/i2c/ov2659.c:894:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = ov2659->client; ^~~~~~ ~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:894:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = ov2659->client; ^~~~~~ ~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:985:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = v4l2_get_subdevdata(sd); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:985:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = v4l2_get_subdevdata(sd); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1001:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = v4l2_get_subdevdata(sd); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1001:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = v4l2_get_subdevdata(sd); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1027:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = v4l2_get_subdevdata(sd); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1027:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = v4l2_get_subdevdata(sd); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1150:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = ov2659->client; ^~~~~~ ~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1150:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = ov2659->client; ^~~~~~ ~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1159:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = ov2659->client; ^~~~~~ ~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1159:21: note: Value stored to 'client' during its initialization is never read struct i2c_client *client = ov2659->client; ^~~~~~ ~~~~~~~~~~~~~~ drivers/media/i2c/ov2659.c:1303:21: warning: Value stored to 'client' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i2c_client *client = v4l2_get_subdevdata(sd); vim +153 drivers/media/pci/saa7134/saa7134-tvaudio.c ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 148 ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 149 static u32 tvaudio_carr2reg(u32 carrier) ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 150 { ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 151 u64 a = carrier; ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 152 ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 @153 a <<= 24; ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 154 do_div(a,12288); ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 155 return a; ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 156 } ^1da177e4c3f41 drivers/media/video/saa7134/saa7134-tvaudio.c Linus Torvalds 2005-04-16 157 :::::: The code at line 153 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <[email protected]> :::::: CC: Linus Torvalds <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected] _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
