Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 2 Dec 2020 20:33:50 +0800 | From | kernel test robot <> | Subject | [tip:core/entry 5/14] kernel/entry/syscall_user_dispatch.c:32:6: warning: no previous prototype for function 'syscall_user_dispatch' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/entry head: 1568b5540b3e6ff3fe43a2cf889cb777cf8149fc commit: 7a2cc679e8bb5bfdeef28ec80dc3c34edbc099fd [5/14] kernel: Implement selective syscall userspace redirection config: x86_64-randconfig-a004-20201201 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 2671fccf0381769276ca8246ec0499adcb9b0355) 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://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=7a2cc679e8bb5bfdeef28ec80dc3c34edbc099fd git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch --no-tags tip core/entry git checkout 7a2cc679e8bb5bfdeef28ec80dc3c34edbc099fd # 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@intel.com>
All warnings (new ones prefixed by >>):
>> kernel/entry/syscall_user_dispatch.c:32:6: warning: no previous prototype for function 'syscall_user_dispatch' [-Wmissing-prototypes] bool syscall_user_dispatch(struct pt_regs *regs) ^ kernel/entry/syscall_user_dispatch.c:32:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool syscall_user_dispatch(struct pt_regs *regs) ^ static 1 warning generated.
vim +/syscall_user_dispatch +32 kernel/entry/syscall_user_dispatch.c
31 > 32 bool syscall_user_dispatch(struct pt_regs *regs) 33 { 34 struct syscall_user_dispatch *sd = ¤t->syscall_dispatch; 35 char state; 36 37 if (likely(instruction_pointer(regs) - sd->offset < sd->len)) 38 return false; 39 40 if (unlikely(arch_syscall_is_vdso_sigreturn(regs))) 41 return false; 42 43 if (likely(sd->selector)) { 44 /* 45 * access_ok() is performed once, at prctl time, when 46 * the selector is loaded by userspace. 47 */ 48 if (unlikely(__get_user(state, sd->selector))) 49 do_exit(SIGSEGV); 50 51 if (likely(state == PR_SYS_DISPATCH_OFF)) 52 return false; 53 54 if (state != PR_SYS_DISPATCH_ON) 55 do_exit(SIGSYS); 56 } 57 58 sd->on_dispatch = true; 59 syscall_rollback(current, regs); 60 trigger_sigsys(regs); 61 62 return true; 63 } 64
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