tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/uaccess/rework head: 692de878f919de31942d0d28571b5e6f32c7135e commit: d8e501ad8a85b31fbff728b8bb17e89e58076c3d [17/19] HACK: test config: arm64-randconfig-r035-20211008 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 30caca39f401ae17927439c0a0bd6d1b1916dd6a) 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://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=d8e501ad8a85b31fbff728b8bb17e89e58076c3d git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git git fetch --no-tags mark arm64/uaccess/rework git checkout d8e501ad8a85b31fbff728b8bb17e89e58076c3d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> arch/arm64/kernel/traps.c:443:5: warning: no previous prototype for function 'hark_foo' [-Wmissing-prototypes] int hark_foo(int __user *thing) ^ arch/arm64/kernel/traps.c:443:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int hark_foo(int __user *thing) ^ static arch/arm64/kernel/traps.c:558:43: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] __user_cache_maint("dc civac", address, ret); ^ arch/arm64/kernel/traps.c:558:3: note: use constraint modifier "w" __user_cache_maint("dc civac", address, ret); ^ arch/arm64/kernel/traps.c:540:4: note: expanded from macro '__user_cache_maint' _ASM_EXTABLE_EFAULT(1b, 2b, %0) \ ^ arch/arm64/include/asm/asm-extable.h:67:2: note: expanded from macro '_ASM_EXTABLE_EFAULT' _ASM_EXTABLE_EFAULT_ZERO(insn, fixup, err, xzr) ^ arch/arm64/include/asm/asm-extable.h:64:10: note: expanded from macro '_ASM_EXTABLE_EFAULT_ZERO' "(" EX_DATA_REG(ERR, err) " | " EX_DATA_REG(ZERO, zero) ")") ^ arch/arm64/include/asm/asm-extable.h:59:19: note: expanded from macro 'EX_DATA_REG' "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" ^ :12:2: note: expanded from here "%0" ^ arch/arm64/kernel/traps.c:561:43: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] __user_cache_maint("dc civac", address, ret); ^ arch/arm64/kernel/traps.c:561:3: note: use constraint modifier "w" __user_cache_maint("dc civac", address, ret); ^ arch/arm64/kernel/traps.c:540:4: note: expanded from macro '__user_cache_maint' _ASM_EXTABLE_EFAULT(1b, 2b, %0) \ ^ arch/arm64/include/asm/asm-extable.h:67:2: note: expanded from macro '_ASM_EXTABLE_EFAULT' _ASM_EXTABLE_EFAULT_ZERO(insn, fixup, err, xzr) ^ arch/arm64/include/asm/asm-extable.h:64:10: note: expanded from macro '_ASM_EXTABLE_EFAULT_ZERO' "(" EX_DATA_REG(ERR, err) " | " EX_DATA_REG(ZERO, zero) ")") ^ arch/arm64/include/asm/asm-extable.h:59:19: note: expanded from macro 'EX_DATA_REG' "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" ^ :23:2: note: expanded from here "%0" ^ arch/arm64/kernel/traps.c:564:52: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] __user_cache_maint("sys 3, c7, c13, 1", address, ret); ^ arch/arm64/kernel/traps.c:564:3: note: use constraint modifier "w" __user_cache_maint("sys 3, c7, c13, 1", address, ret); ^ arch/arm64/kernel/traps.c:540:4: note: expanded from macro '__user_cache_maint' _ASM_EXTABLE_EFAULT(1b, 2b, %0) \ ^ arch/arm64/include/asm/asm-extable.h:67:2: note: expanded from macro '_ASM_EXTABLE_EFAULT' _ASM_EXTABLE_EFAULT_ZERO(insn, fixup, err, xzr) ^ arch/arm64/include/asm/asm-extable.h:64:10: note: expanded from macro '_ASM_EXTABLE_EFAULT_ZERO' "(" EX_DATA_REG(ERR, err) " | " EX_DATA_REG(ZERO, zero) ")") ^ arch/arm64/include/asm/asm-extable.h:59:19: note: expanded from macro 'EX_DATA_REG' "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" ^ :34:2: note: expanded from here "%0" ^ arch/arm64/kernel/traps.c:567:52: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] __user_cache_maint("sys 3, c7, c12, 1", address, ret); ^ arch/arm64/kernel/traps.c:567:3: note: use constraint modifier "w" __user_cache_maint("sys 3, c7, c12, 1", address, ret); ^ arch/arm64/kernel/traps.c:540:4: note: expanded from macro '__user_cache_maint' _ASM_EXTABLE_EFAULT(1b, 2b, %0) \ ^ arch/arm64/include/asm/asm-extable.h:67:2: note: expanded from macro '_ASM_EXTABLE_EFAULT' _ASM_EXTABLE_EFAULT_ZERO(insn, fixup, err, xzr) ^ arch/arm64/include/asm/asm-extable.h:64:10: note: expanded from macro '_ASM_EXTABLE_EFAULT_ZERO' "(" EX_DATA_REG(ERR, err) " | " EX_DATA_REG(ZERO, zero) ")") ^ arch/arm64/include/asm/asm-extable.h:59:19: note: expanded from macro 'EX_DATA_REG' "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" ^ :45:2: note: expanded from here "%0" ^ arch/arm64/kernel/traps.c:570:43: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths] __user_cache_maint("dc civac", address, ret); ^ arch/arm64/kernel/traps.c:570:3: note: use constraint modifier "w" __user_cache_maint("dc civac", address, ret); ^ arch/arm64/kernel/traps.c:540:4: note: expanded from macro '__user_cache_maint' _ASM_EXTABLE_EFAULT(1b, 2b, %0) \ ^ arch/arm64/include/asm/asm-extable.h:67:2: note: expanded from macro '_ASM_EXTABLE_EFAULT' vim +/hark_foo +443 arch/arm64/kernel/traps.c 442 > 443 int hark_foo(int __user *thing) 444 { 445 int val; 446 447 if (!get_user(val, thing)) 448 return val; 449 450 return 0xf00fd00d; 451 } 452 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org