tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.4 head: 3b6a904f7f8252098cad6232d596d8df5a89f93a commit: 3b6a904f7f8252098cad6232d596d8df5a89f93a [4/4] UPSTREAM: usbnet: fix alignment for frames with no ethernet header config: x86_64-randconfig-a011-20200920 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 6a6b06f5262bb96523eceef4a42fe8e60ae2a630) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 3b6a904f7f8252098cad6232d596d8df5a89f93a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 mm/vmscan.c:19: In file included from include/linux/kernel_stat.h:8: In file included from include/linux/interrupt.h:12: In file included from include/linux/hardirq.h:8: In file included from arch/x86/include/asm/hardirq.h:5: In file included from include/linux/irq.h:418: In file included from arch/x86/include/asm/hw_irq.h:26: In file included from arch/x86/include/asm/sections.h:5: arch/x86/include/asm/uaccess.h:754:26: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare] if (likely(sz < 0 || sz >= n)) { ~~ ^ ~ include/linux/compiler.h:181:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ In file included from mm/vmscan.c:19: In file included from include/linux/kernel_stat.h:8: In file included from include/linux/interrupt.h:12: In file included from include/linux/hardirq.h:8: In file included from arch/x86/include/asm/hardirq.h:5: In file included from include/linux/irq.h:418: In file included from arch/x86/include/asm/hw_irq.h:26: In file included from arch/x86/include/asm/sections.h:5: arch/x86/include/asm/uaccess.h:773:26: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare] if (likely(sz < 0 || sz >= n)) { ~~ ^ ~ include/linux/compiler.h:181:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ In file included from mm/vmscan.c:19: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/sched.h:62: In file included from include/linux/cgroup-defs.h:16: include/linux/percpu-refcount.h:177:3: warning: comparison of integers of different signs: 'unsigned long' and 'int' [-Wsign-compare] this_cpu_add(*percpu_count, nr); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:526:33: note: expanded from macro 'this_cpu_add' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:397:11: note: expanded from macro '__pcpu_size_call' case 8: stem##8(variable, __VA_ARGS__);break; \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <scratch space>:215:1: note: expanded from here this_cpu_add_8 ^ arch/x86/include/asm/percpu.h:478:35: note: expanded from macro 'this_cpu_add_8' #define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val) ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/include/asm/percpu.h:130:31: note: expanded from macro 'percpu_add_op' ((val) == 1 || (val) == -1)) ? \ ~~~ ^ ~~ In file included from mm/vmscan.c:19: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/sched.h:62: In file included from include/linux/cgroup-defs.h:16: include/linux/percpu-refcount.h:276:3: warning: comparison of integers of different signs: 'unsigned long' and 'int' [-Wsign-compare] this_cpu_sub(*percpu_count, nr); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:536:33: note: expanded from macro 'this_cpu_sub' #define this_cpu_sub(pcp, val) this_cpu_add(pcp, -(typeof(pcp))(val)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:526:33: note: expanded from macro 'this_cpu_add' #define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/percpu-defs.h:397:11: note: expanded from macro '__pcpu_size_call' case 8: stem##8(variable, __VA_ARGS__);break; \ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <scratch space>:375:1: note: expanded from here this_cpu_add_8 ^ arch/x86/include/asm/percpu.h:478:35: note: expanded from macro 'this_cpu_add_8' #define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val) ^~~~~~~~~~~~~~~~~~~~~~~~~ arch/x86/include/asm/percpu.h:130:31: note: expanded from macro 'percpu_add_op' ((val) == 1 || (val) == -1)) ? \ ~~~ ^ ~~ In file included from mm/vmscan.c:55: include/linux/swapops.h:225:22: warning: section attribute is specified on redeclared variable [-Wsection] extern atomic_long_t num_poisoned_pages __read_mostly; ^ include/linux/mm.h:2369:22: note: previous declaration is here extern atomic_long_t num_poisoned_pages; ^ mm/vmscan.c:334:12: warning: comparison of integers of different signs: 'unsigned long long' and 'long' [-Wsign-compare] if (delta < freeable / 4) ~~~~~ ^ ~~~~~~~~~~~~ mm/vmscan.c:2681:29: warning: comparison of integers of different signs: 'int' and 'enum zone_type' [-Wsign-compare] zonelist_zone_idx(z) <= requested_highidx && ~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~ mm/vmscan.c:3971:16: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare] for (i = 0; i < pvec->nr; i++) { ~ ^ ~~~~~~~~ 8 warnings generated. /tmp/vmscan-557362.s: Assembler messages: /tmp/vmscan-557362.s:7578: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts' /tmp/vmscan-557362.s:9565: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts' /tmp/vmscan-557362.s:9725: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' /tmp/vmscan-557362.s:10408: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts' /tmp/vmscan-557362.s:19182: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' /tmp/vmscan-557362.s:20083: Warning: no instruction mnemonic suffix given and no register operands; using default for `bts' /tmp/vmscan-557362.s:24740: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' /tmp/vmscan-557362.s:24748: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' /tmp/vmscan-557362.s:25480: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' /tmp/vmscan-557362.s:25488: Warning: no instruction mnemonic suffix given and no register operands; using default for `btr' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org