Re: [linux-next:master 11855/12471] arch/riscv/net/bpf_jit_comp64.c:462:5: warning: no previous prototype for function 'rv_bpf_fixup_exception'

[Daniel Borkmann <daniel@iogearbox.net>]

[ +Bjorn ]

On 10/28/21 9:45 PM, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   503f375baa99edff894eb1a534d2ac0b4f799573
> commit: 252c765bd764a246a8bd516fabf6d6123df4a24f [11855/12471] riscv, bpf: Add BPF exception tables
> config: riscv-randconfig-r042-20211028 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5db7568a6a1fcb408eb8988abdaff2a225a8eb72)
> 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 riscv cross compiling tool for clang build
>          # apt-get install binutils-riscv64-linux-gnu
>          # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=252c765bd764a246a8bd516fabf6d6123df4a24f
>          git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>          git fetch --no-tags linux-next master
>          git checkout 252c765bd764a246a8bd516fabf6d6123df4a24f
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv
> 
> 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/riscv/net/bpf_jit_comp64.c:462:5: warning: no previous prototype for function 'rv_bpf_fixup_exception' [-Wmissing-prototypes]
>     int rv_bpf_fixup_exception(const struct exception_table_entry *ex,
>         ^
>     arch/riscv/net/bpf_jit_comp64.c:462:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>     int rv_bpf_fixup_exception(const struct exception_table_entry *ex,
>     ^
>     static
>     1 warning generated.

Tong, Bjorn, ptal

> vim +/rv_bpf_fixup_exception +462 arch/riscv/net/bpf_jit_comp64.c
> 
>     461	
>   > 462	int rv_bpf_fixup_exception(const struct exception_table_entry *ex,
>     463					struct pt_regs *regs)
>     464	{
>     465		off_t offset = FIELD_GET(BPF_FIXUP_OFFSET_MASK, ex->fixup);
>     466		int regs_offset = FIELD_GET(BPF_FIXUP_REG_MASK, ex->fixup);
>     467	
>     468		*(unsigned long *)((void *)regs + pt_regmap[regs_offset]) = 0;
>     469		regs->epc = (unsigned long)&ex->fixup - offset;
>     470	
>     471		return 1;
>     472	}
>     473	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>