Hi André, FYI, the error/warning still remains. tree: https://github.com/zen-kernel/zen-kernel 5.12/futex2 head: 81255c11c48cc2302883425c87318f9cad37e7e6 commit: 04a97ad2406166e12a13f09c9981f18e6487f530 [3/16] futex2: Implement vectorized wait config: x86_64-randconfig-a011-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 # https://github.com/zen-kernel/zen-kernel/commit/04a97ad2406166e12a13f09c9... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.12/futex2 git checkout 04a97ad2406166e12a13f09c9981f18e6487f530 # 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 >>): kernel/sys_ni.c:155:1: warning: no previous prototype for function '__ia32_sys_futex_wake' [-Wmissing-prototypes] COND_SYSCALL(futex_wake); ^ arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL' __IA32_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL' __COND_SYSCALL(ia32, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:142:1: note: expanded from here __ia32_sys_futex_wake ^ kernel/sys_ni.c:155:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL' __IA32_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL' __COND_SYSCALL(ia32, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:156:1: warning: no previous prototype for function '__x64_sys_futex_waitv' [-Wmissing-prototypes] COND_SYSCALL(futex_waitv); ^ arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL' __X64_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL' __COND_SYSCALL(x64, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:146:1: note: expanded from here __x64_sys_futex_waitv ^ kernel/sys_ni.c:156:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL' __X64_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL' __COND_SYSCALL(x64, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:156:1: warning: no previous prototype for function '__ia32_sys_futex_waitv' [-Wmissing-prototypes] COND_SYSCALL(futex_waitv); ^ arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL' __IA32_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL' __COND_SYSCALL(ia32, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:150:1: note: expanded from here __ia32_sys_futex_waitv ^ kernel/sys_ni.c:156:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL' __IA32_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL' __COND_SYSCALL(ia32, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:157:1: warning: no previous prototype for function '__ia32_compat_sys_futex_waitv' [-Wmissing-prototypes] COND_SYSCALL_COMPAT(futex_waitv); ^ arch/x86/include/asm/syscall_wrapper.h:218:2: note: expanded from macro 'COND_SYSCALL_COMPAT' __IA32_COMPAT_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:148:2: note: expanded from macro '__IA32_COMPAT_COND_SYSCALL' __COND_SYSCALL(ia32, compat_sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:154:1: note: expanded from here __ia32_compat_sys_futex_waitv ^ kernel/sys_ni.c:157:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:218:2: note: expanded from macro 'COND_SYSCALL_COMPAT' __IA32_COMPAT_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:148:2: note: expanded from macro '__IA32_COMPAT_COND_SYSCALL' __COND_SYSCALL(ia32, compat_sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ COND_SYSCALL_COMPAT(futex_waitv); ^ arch/x86/include/asm/syscall_wrapper.h:219:2: note: expanded from macro 'COND_SYSCALL_COMPAT' __X32_COMPAT_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:175:2: note: expanded from macro '__X32_COMPAT_COND_SYSCALL' __COND_SYSCALL(x32, compat_sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:158:1: note: expanded from here __x32_compat_sys_futex_waitv ^ kernel/sys_ni.c:157:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:219:2: note: expanded from macro 'COND_SYSCALL_COMPAT' __X32_COMPAT_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:175:2: note: expanded from macro '__X32_COMPAT_COND_SYSCALL' __COND_SYSCALL(x32, compat_sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:164:1: warning: no previous prototype for function '__x64_sys_kexec_load' [-Wmissing-prototypes] COND_SYSCALL(kexec_load); ^ arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL' __X64_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL' __COND_SYSCALL(x64, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:162:1: note: expanded from here __x64_sys_kexec_load ^ kernel/sys_ni.c:164:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:256:2: note: expanded from macro 'COND_SYSCALL' __X64_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:100:2: note: expanded from macro '__X64_COND_SYSCALL' __COND_SYSCALL(x64, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:164:1: warning: no previous prototype for function '__ia32_sys_kexec_load' [-Wmissing-prototypes] COND_SYSCALL(kexec_load); ^ arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL' __IA32_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL' __COND_SYSCALL(ia32, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:166:1: note: expanded from here __ia32_sys_kexec_load ^ kernel/sys_ni.c:164:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:257:2: note: expanded from macro 'COND_SYSCALL' __IA32_COND_SYSCALL(name) ^ arch/x86/include/asm/syscall_wrapper.h:120:2: note: expanded from macro '__IA32_COND_SYSCALL' __COND_SYSCALL(ia32, sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:165:1: warning: no previous prototype for function '__ia32_compat_sys_kexec_load' [-Wmissing-prototypes] COND_SYSCALL_COMPAT(kexec_load); ^ arch/x86/include/asm/syscall_wrapper.h:218:2: note: expanded from macro 'COND_SYSCALL_COMPAT' __IA32_COMPAT_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:148:2: note: expanded from macro '__IA32_COMPAT_COND_SYSCALL' __COND_SYSCALL(ia32, compat_sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:14: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ <scratch space>:170:1: note: expanded from here __ia32_compat_sys_kexec_load ^ kernel/sys_ni.c:165:1: note: declare 'static' if the function is not intended to be used outside of this translation unit arch/x86/include/asm/syscall_wrapper.h:218:2: note: expanded from macro 'COND_SYSCALL_COMPAT' __IA32_COMPAT_COND_SYSCALL(name) \ ^ arch/x86/include/asm/syscall_wrapper.h:148:2: note: expanded from macro '__IA32_COMPAT_COND_SYSCALL' __COND_SYSCALL(ia32, compat_sys_##name) ^ arch/x86/include/asm/syscall_wrapper.h:83:9: note: expanded from macro '__COND_SYSCALL' __weak long __##abi##_##name(const struct pt_regs *__unused) \ ^ kernel/sys_ni.c:165:1: warning: no previous prototype for function '__x32_compat_sys_kexec_load' [-Wmissing-prototypes] vim +/__x32_compat_sys_futex_waitv +157 kernel/sys_ni.c 152 153 /* kernel/futex2.c */ 154 COND_SYSCALL(futex_wait); 155 COND_SYSCALL(futex_wake); 156 COND_SYSCALL(futex_waitv); 158 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org