Messages in this thread | | | Date | Thu, 3 Feb 2022 14:55:27 +0800 | From | kernel test robot <> | Subject | [mhiramat:kprobes/fprobe 7/10] arch/x86/kernel/rethook.c:14:23: warning: no previous prototype for function 'arch_rethook_trampoline_callback' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git kprobes/fprobe head: 1f4f90c86628a76e7eac24ab732db49fc3a961d6 commit: 806149decce8b0870024d2676b46bb3d295c38b3 [7/10] fprobe: Add exit_handler support config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220203/202202031451.vmQ3ciMx-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a73e4ce6a59b01f0e37037761c1e6889d539d233) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git/commit/?id=806149decce8b0870024d2676b46bb3d295c38b3 git remote add mhiramat https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git git fetch --no-tags mhiramat kprobes/fprobe git checkout 806149decce8b0870024d2676b46bb3d295c38b3 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/
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 >>):
>> arch/x86/kernel/rethook.c:14:23: warning: no previous prototype for function 'arch_rethook_trampoline_callback' [-Wmissing-prototypes] __used __visible void arch_rethook_trampoline_callback(struct pt_regs *regs) ^ arch/x86/kernel/rethook.c:14:18: note: declare 'static' if the function is not intended to be used outside of this translation unit __used __visible void arch_rethook_trampoline_callback(struct pt_regs *regs) ^ static 1 warning generated.
vim +/arch_rethook_trampoline_callback +14 arch/x86/kernel/rethook.c
9de3b995c35eb6 Masami Hiramatsu 2022-01-26 10 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 11 /* 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 12 * Called from arch_rethook_trampoline 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 13 */ 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 @14 __used __visible void arch_rethook_trampoline_callback(struct pt_regs *regs) 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 15 { 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 16 unsigned long *frame_pointer; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 17 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 18 /* fixup registers */ 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 19 regs->cs = __KERNEL_CS; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 20 #ifdef CONFIG_X86_32 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 21 regs->gs = 0; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 22 #endif 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 23 regs->ip = (unsigned long)&arch_rethook_trampoline; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 24 regs->orig_ax = ~0UL; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 25 regs->sp += sizeof(long); 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 26 frame_pointer = ®s->sp + 1; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 27 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 28 /* 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 29 * The return address at 'frame_pointer' is recovered by the 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 30 * arch_rethook_fixup_return() which called from this 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 31 * rethook_trampoline_handler(). 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 32 */ 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 33 rethook_trampoline_handler(regs, (unsigned long)frame_pointer); 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 34 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 35 /* 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 36 * Copy FLAGS to 'pt_regs::sp' so that arch_rethook_trapmoline() 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 37 * can do RET right after POPF. 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 38 */ 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 39 regs->sp = regs->flags; 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 40 } 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 41 NOKPROBE_SYMBOL(arch_rethook_trampoline_callback); 9de3b995c35eb6 Masami Hiramatsu 2022-01-26 42
:::::: The code at line 14 was first introduced by commit :::::: 9de3b995c35eb68273cf462f30663340ee47f8d6 rethook: x86: Add rethook x86 implementation
:::::: TO: Masami Hiramatsu <mhiramat@kernel.org> :::::: CC: Masami Hiramatsu <mhiramat@kernel.org>
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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