[ammarfaizi2-block:palmer/linux/riscv-compat 18/20] arch/riscv/include/asm/signal32.h:10:5: warning: no previous prototype for function 'compat_setup_rt_frame'

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block palmer/linux/riscv-compat
head:   8d05fa26dd28024fc3f915bf06be41ab7c3204ab
commit: 299073d795e482ae6a762105fbc3953ec445badd [18/20] riscv: compat: signal: Add rt_frame implementation
config: riscv-randconfig-r002-20220425 (https://download.01.org/0day-ci/archive/20220427/202204271718.xbiawVrz-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 1cddcfdc3c683b393df1a5c9063252eb60e52818)
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://github.com/ammarfaizi2/linux-block/commit/299073d795e482ae6a762105fbc3953ec445badd
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block palmer/linux/riscv-compat
        git checkout 299073d795e482ae6a762105fbc3953ec445badd
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/ kernel/bpf/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   In file included from arch/riscv/kernel/signal.c:12:
   In file included from include/linux/syscalls.h:88:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from arch/riscv/kernel/signal.c:12:
   In file included from include/linux/syscalls.h:88:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from arch/riscv/kernel/signal.c:12:
   In file included from include/linux/syscalls.h:88:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
   In file included from arch/riscv/kernel/signal.c:18:
>> arch/riscv/include/asm/signal32.h:10:5: warning: no previous prototype for function 'compat_setup_rt_frame' [-Wmissing-prototypes]
   int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
       ^
   arch/riscv/include/asm/signal32.h:10:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
   ^
   static 
   arch/riscv/kernel/signal.c:316:27: warning: no previous prototype for function 'do_notify_resume' [-Wmissing-prototypes]
   asmlinkage __visible void do_notify_resume(struct pt_regs *regs,
                             ^
   arch/riscv/kernel/signal.c:316:22: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage __visible void do_notify_resume(struct pt_regs *regs,
                        ^
                        static 
   9 warnings generated.


vim +/compat_setup_rt_frame +10 arch/riscv/include/asm/signal32.h

     5	
     6	#if IS_ENABLED(CONFIG_COMPAT)
     7	int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
     8				  struct pt_regs *regs);
     9	#else
  > 10	int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
    11				  struct pt_regs *regs)
    12	{
    13		return -1;
    14	}
    15	#endif
    16	

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