tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.4 head: 1075cf3343daaea3174e6916049acc89471bf9bd commit: 1075cf3343daaea3174e6916049acc89471bf9bd [5/5] BACKPORT: drm/i915: Account for scale factor when calculating initial phase config: x86_64-randconfig-a005-20200807 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project aa57cabae2fc5abc08ab3e17b45f2890fc7c9e42) 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 1075cf3343daaea3174e6916049acc89471bf9bd # 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 sound/usb/midi.c:41: 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 sound/usb/midi.c:41: 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 sound/usb/midi.c:45: In file included from include/linux/slab.h:113: In file included from include/linux/kasan.h:4: 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>:260:1: 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 sound/usb/midi.c:45: In file included from include/linux/slab.h:113: In file included from include/linux/kasan.h:4: 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>:420:1: 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)) ? \ ~~~ ^ ~~ sound/usb/midi.c:481:20: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare] for (i = 0; i + 3 < buffer_length; i += 4) { ~~~~~ ^ ~~~~~~~~~~~~~ sound/usb/midi.c:663:42: warning: comparison of integers of different signs: 'unsigned int' and 'int' [-Wsign-compare] while (urb->transfer_buffer_length + 3 < ep->max_transfer) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~ sound/usb/midi.c:751:37: warning: comparison of integers of different signs: 'u32' (aka 'unsigned int') and 'int' [-Wsign-compare] while (urb->transfer_buffer_length < buf_end) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~ sound/usb/midi.c:1080:44: warning: comparison of integers of different signs: 'unsigned long' and 'int' [-Wsign-compare] if (umidi->roland_load_ctl->private_value == is_light_load) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~ sound/usb/midi.c:1713:16: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare] for (i = 0; i < ARRAY_SIZE(snd_usbmidi_port_info); ++i) { ~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 warnings generated. /tmp/midi-259676.s: Assembler messages: --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org