[kbuild-all] [alibaba-cloud:linux-next 11672/12249] include/linux/seq_buf.h:35:12: warning: assigning to 'char from 'unsigned char converts between pointers to integer types with different sign

tree: https://github.com/alibaba/cloud-kernel.git linux-next head: c3ac3c331d6cc495be9603404799c061d71af44c commit: 9ba61fa50195f2a1c05702b3d83141bcc589e1b8 [11672/12249] firmware: arm_sdei: Add ACPI GHES registration helper config: arm64-randconfig-r006-20200927 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 6d374cf78c8a80a0bbfc7ce9bc80b3f183f44c80) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/alibaba/cloud-kernel/commit/9ba61fa50195f2a1c05702b3d8... git remote add alibaba-cloud https://github.com/alibaba/cloud-kernel.git git fetch --no-tags alibaba-cloud linux-next git checkout 9ba61fa50195f2a1c05702b3d83141bcc589e1b8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 include/linux/bitops.h:26: In file included from arch/arm64/include/asm/bitops.h:40: In file included from include/asm-generic/bitops/le.h:6: In file included from arch/arm64/include/uapi/asm/byteorder.h:23: In file included from include/linux/byteorder/little_endian.h:11: include/linux/byteorder/generic.h:195:16: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare] for (i = 0; i < len; i++) ~ ^ ~~~ include/linux/byteorder/generic.h:203:16: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare] for (i = 0; i < len; i++) ~ ^ ~~~ 2 warnings generated. In file included from arch/arm64/kernel/asm-offsets.c:21: In file included from include/linux/arm_sdei.h:14: In file included from include/acpi/ghes.h:5: In file included from include/acpi/apei.h:9: In file included from include/linux/acpi.h:26: In file included from include/linux/resource_ext.h:17: In file included from include/linux/list.h:9: In file included from include/linux/kernel.h:11: In file included from include/linux/bitops.h:26: In file included from arch/arm64/include/asm/bitops.h:40: In file included from include/asm-generic/bitops/le.h:6: In file included from arch/arm64/include/uapi/asm/byteorder.h:23: In file included from include/linux/byteorder/little_endian.h:11: include/linux/byteorder/generic.h:195:16: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare] for (i = 0; i < len; i++) ~ ^ ~~~ include/linux/byteorder/generic.h:203:16: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare] for (i = 0; i < len; i++) ~ ^ ~~~ In file included from arch/arm64/kernel/asm-offsets.c:21: In file included from include/linux/arm_sdei.h:14: In file included from include/acpi/ghes.h:5: In file included from include/acpi/apei.h:9: In file included from include/linux/acpi.h:26: In file included from include/linux/resource_ext.h:19: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:6: In file included from include/linux/mmzone.h:8: In file included from include/linux/spinlock.h:51: In file included from include/linux/preempt.h:81: In file included from ./arch/arm64/include/generated/asm/preempt.h:1: In file included from include/asm-generic/preempt.h:5: include/linux/thread_info.h:141:29: warning: comparison of integers of different signs: 'int' and 'size_t' (aka 'unsigned long') [-Wsign-compare] if (unlikely(sz >= 0 && sz < bytes)) { ~~ ^ ~~~~~ include/linux/compiler.h:77:42: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ In file included from arch/arm64/kernel/asm-offsets.c:21: In file included from include/linux/arm_sdei.h:14: In file included from include/acpi/ghes.h:5: In file included from include/acpi/apei.h:9: In file included from include/linux/acpi.h:26: In file included from include/linux/resource_ext.h:19: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:6: In file included from include/linux/mmzone.h:8: In file included from include/linux/spinlock.h:88: In file included from arch/arm64/include/asm/spinlock.h:19: In file included from ./arch/arm64/include/generated/asm/qrwlock.h:1: include/asm-generic/qrwlock.h:75:36: warning: comparison of integers of different signs: 'int' and 'u32' (aka 'unsigned int') [-Wsign-compare] cnts, cnts | _QW_LOCKED) == cnts); ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~ include/linux/compiler.h:76:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ In file included from arch/arm64/kernel/asm-offsets.c:21: In file included from include/linux/arm_sdei.h:14: In file included from include/acpi/ghes.h:5: In file included from include/acpi/apei.h:9: In file included from include/linux/acpi.h:26: In file included from include/linux/resource_ext.h:19: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:6: In file included from include/linux/mmzone.h:22: include/linux/page-flags.h:166:21: warning: comparison of integers of different signs: 'const unsigned long' and 'long' [-Wsign-compare] return page->flags == PAGE_POISON_PATTERN; ~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~ In file included from arch/arm64/kernel/asm-offsets.c:21: In file included from include/linux/arm_sdei.h:14: In file included from include/acpi/ghes.h:5: In file included from include/acpi/apei.h:9: In file included from include/linux/acpi.h:26: In file included from include/linux/resource_ext.h:19: In file included from include/linux/slab.h:15: In file included from include/linux/gfp.h:6: include/linux/mmzone.h:1021:44: warning: comparison of integers of different signs: 'int' and 'enum zone_type' [-Wsign-compare] if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx)) ~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~ include/linux/compiler.h:76:40: note: expanded from macro 'likely' # define likely(x) __builtin_expect(!!(x), 1) ^ In file included from arch/arm64/kernel/asm-offsets.c:21: In file included from include/linux/arm_sdei.h:14: In file included from include/acpi/ghes.h:5: In file included from include/acpi/apei.h:10: In file included from include/linux/cper.h:25: In file included from include/linux/trace_seq.h:5: s->buffer = buf; ^ ~~~ In file included from arch/arm64/kernel/asm-offsets.c:23: In file included from include/linux/mm.h:1265: include/linux/vmstat.h:221:2: warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare] for_each_online_cpu(cpu) ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cpumask.h:778:36: note: expanded from macro 'for_each_online_cpu' #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/cpumask.h:243:9: note: expanded from macro 'for_each_cpu' (cpu) < nr_cpu_ids;) ~~~ ^ ~~~~~~~~~~ In file included from arch/arm64/kernel/asm-offsets.c:25: In file included from include/linux/kvm_host.h:39: In file included from arch/arm64/include/asm/kvm_host.h:42: In file included from include/kvm/arm_pmu.h:21: In file included from include/linux/perf_event.h:57: In file included from include/linux/cgroup.h:28: include/linux/cgroup-defs.h:484:16: warning: field 'cgrp' with variable sized type 'struct cgroup' not at the end of a struct or class is a GNU extension [-Wgnu-variable-sized-type-not-at-end] struct cgroup cgrp; ^ In file included from arch/arm64/kernel/asm-offsets.c:32: arch/arm64/include/asm/smp_plat.h:53:20: warning: comparison of integers of different signs: 'int' and 'unsigned int' [-Wsign-compare] for (cpu = 0; cpu < nr_cpu_ids; cpu++) ~~~ ^ ~~~~~~~~~~ 10 warnings generated. /usr/bin/as: unrecognized option '-EL' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) make[2]: *** [arch/arm64/kernel/vdso/Makefile:54: arch/arm64/kernel/vdso/gettimeofday.o] Error 1 /usr/bin/as: unrecognized option '-EL' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) make[2]: *** [arch/arm64/kernel/vdso/Makefile:54: arch/arm64/kernel/vdso/note.o] Error 1 /usr/bin/as: unrecognized option '-EL' clang-12: error: assembler command failed with exit code 1 (use -v to see invocation) make[2]: *** [arch/arm64/kernel/vdso/Makefile:54: arch/arm64/kernel/vdso/sigreturn.o] Error 1 make[2]: Target 'include/generated/vdso-offsets.h' not remade because of errors. make[1]: *** [arch/arm64/Makefile:175: vdso_prepare] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:146: sub-make] Error 2 make: Target 'prepare' not remade because of errors. vim +35 include/linux/seq_buf.h 0736c033a81547b Steven Rostedt (Red Hat 2014-10-29 31) 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 32) static inline void 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 33) seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size) 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 34) { 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 @35) s->buffer = buf; 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 36) s->size = size; 0736c033a81547b Steven Rostedt (Red Hat 2014-10-29 37) seq_buf_clear(s); 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 38) } 3a161d99c43ce74 Steven Rostedt (Red Hat 2014-06-25 39) :::::: The code at line 35 was first introduced by commit :::::: 3a161d99c43ce74c76aecff309be4c3ba455e823 tracing: Create seq_buf layer in trace_seq :::::: TO: Steven Rostedt (Red Hat) <rostedt(a)goodmis.org&gt; :::::: CC: Steven Rostedt <rostedt(a)goodmis.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org