tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y head: 3a10b2060ca30843d9251b80a2e1ca71e68035bd commit: f66a52d991de7ca6c6dc7db768b50e6a28916d1f [4058/6859] kbuild: clang: choose GCC_TOOLCHAIN_DIR not on LD config: powerpc64-randconfig-r001-20201231 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 6b316febb4388764789677f81f03aff373ec35b2) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.19.y git checkout f66a52d991de7ca6c6dc7db768b50e6a28916d1f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): ^ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:51: include/linux/netdevice.h:3474:15: warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare] BUG_ON(index >= dev->num_rx_queues); ~~~~~ ^ ~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/bug.h:77:7: note: expanded from macro 'BUG_ON' if (x) \ ^ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:51: include/linux/netdevice.h:3785:37: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare] if (debug_value < 0 || debug_value >= (sizeof(u32) * 8)) ~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:64: In file included from include/linux/filter.h:24: In file included from include/net/sch_generic.h:16: In file included from include/net/rtnetlink.h:6: include/net/netlink.h:358:18: warning: comparison of integers of different signs: 'const __u32' (aka 'const unsigned int') and 'int' [-Wsign-compare] nlh->nlmsg_len <= remaining); ~~~~~~~~~~~~~~ ^ ~~~~~~~~~ include/net/netlink.h:395:21: warning: comparison of integers of different signs: 'const __u32' (aka 'const unsigned int') and 'int' [-Wsign-compare] if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~ include/net/netlink.h:430:21: warning: comparison of integers of different signs: 'const __u32' (aka 'const unsigned int') and 'int' [-Wsign-compare] if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:64: In file included from include/linux/filter.h:24: In file included from include/net/sch_generic.h:16: include/net/rtnetlink.h:25:21: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare] if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg)) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:64: In file included from include/linux/filter.h:24: include/net/sch_generic.h:387:33: warning: comparison of integers of different signs: 'unsigned long' and 'int' [-Wsign-compare] BUILD_BUG_ON(sizeof(qcb->data) < sz); ~~~~~~~~~~~~~~~~~ ^ ~~ include/linux/build_bug.h:69:19: note: expanded from macro 'BUILD_BUG_ON' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^~~~~~~~~ include/linux/build_bug.h:45:58: note: expanded from macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~ include/linux/compiler.h:360:22: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^~~~~~~~~ include/linux/compiler.h:348:23: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^~~~~~~~~ include/linux/compiler.h:337:18: note: expanded from macro '__compiletime_assert' int __cond = !(condition); \ ^~~~~~~~~ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:64: In file included from include/linux/filter.h:24: include/net/sch_generic.h:488:13: warning: comparison of integers of different signs: 'int' and 'const unsigned int' [-Wsign-compare] return ntx < dev->real_num_tx_queues ? ~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~ include/net/sch_generic.h:532:15: warning: comparison of integers of different signs: 'u32' (aka 'unsigned int') and 'int' [-Wsign-compare] return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; ~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: In file included from include/net/sock.h:64: include/linux/filter.h:1009:16: warning: comparison of integers of different signs: 'const __u32' (aka 'const unsigned int') and 'int' [-Wsign-compare] if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X) ~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/bluetooth/hci_bcm.c:42: In file included from include/net/bluetooth/bluetooth.h:29: include/net/sock.h:2241:43: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare] return refcount_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~ drivers/bluetooth/hci_bcm.c:776:42: warning: missing field 'quirks' initializer [-Wmissing-field-initializers] { "device-wakeup-gpios", &first_gpio, 1 }, ^ drivers/bluetooth/hci_bcm.c:777:38: warning: missing field 'quirks' initializer [-Wmissing-field-initializers] { "shutdown-gpios", &second_gpio, 1 }, ^ drivers/bluetooth/hci_bcm.c:778:40: warning: missing field 'quirks' initializer [-Wmissing-field-initializers] { "host-wakeup-gpios", &third_gpio, 1 }, ^ drivers/bluetooth/hci_bcm.c:783:40: warning: missing field 'quirks' initializer [-Wmissing-field-initializers] { "host-wakeup-gpios", &first_gpio, 1 }, ^ drivers/bluetooth/hci_bcm.c:784:43: warning: missing field 'quirks' initializer [-Wmissing-field-initializers] { "device-wakeup-gpios", &second_gpio, 1 }, ^ drivers/bluetooth/hci_bcm.c:785:37: warning: missing field 'quirks' initializer [-Wmissing-field-initializers] { "shutdown-gpios", &third_gpio, 1 }, ^ static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { ^ static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { ^ 33 warnings generated. Assembler messages: Fatal error: invalid listing option `6' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) vim +/acpi_bcm_int_last_gpios +775 drivers/bluetooth/hci_bcm.c 89ab37b489d11e2 Daniel Drake 2017-01-05 774 89ab37b489d11e2 Daniel Drake 2017-01-05 @775 static const struct acpi_gpio_mapping acpi_bcm_int_last_gpios[] = { 9644e6b98cda048 Hans de Goede 2018-03-16 776 { "device-wakeup-gpios", &first_gpio, 1 }, 9644e6b98cda048 Hans de Goede 2018-03-16 777 { "shutdown-gpios", &second_gpio, 1 }, 9644e6b98cda048 Hans de Goede 2018-03-16 778 { "host-wakeup-gpios", &third_gpio, 1 }, 89ab37b489d11e2 Daniel Drake 2017-01-05 779 { }, 89ab37b489d11e2 Daniel Drake 2017-01-05 780 }; 89ab37b489d11e2 Daniel Drake 2017-01-05 781 89ab37b489d11e2 Daniel Drake 2017-01-05 @782 static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = { 9644e6b98cda048 Hans de Goede 2018-03-16 783 { "host-wakeup-gpios", &first_gpio, 1 }, 9644e6b98cda048 Hans de Goede 2018-03-16 784 { "device-wakeup-gpios", &second_gpio, 1 }, 9644e6b98cda048 Hans de Goede 2018-03-16 785 { "shutdown-gpios", &third_gpio, 1 }, 0395ffc1ee0509d Frederic Danis 2015-08-11 786 { }, 0395ffc1ee0509d Frederic Danis 2015-08-11 787 }; 0395ffc1ee0509d Frederic Danis 2015-08-11 788 :::::: The code at line 775 was first introduced by commit :::::: 89ab37b489d11e2ec3a70635139dcda076c16354 Bluetooth: hci_bcm: Add support for BCM2E95 and BCM2E96 :::::: TO: Daniel Drake <drake(a)endlessm.com&gt; :::::: CC: Marcel Holtmann <marcel(a)holtmann.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org