[kees:for-next/kspp 19/19] lib/ubsan.c:27:13: warning: no previous prototype for 'report_ubsan_failure'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/kspp
head:   eeea3ad2aae00767549e2e5c50ad5f2dcfb353cd
commit: eeea3ad2aae00767549e2e5c50ad5f2dcfb353cd [19/19] arm64: Support Clang UBSAN trap codes for better reporting
config: s390-randconfig-r044-20230204 (https://download.01.org/0day-ci/archive/20230204/202302041600.oGDByVG5-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
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/kees/linux.git/commit/?id=eeea3ad2aae00767549e2e5c50ad5f2dcfb353cd
        git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
        git fetch --no-tags kees for-next/kspp
        git checkout eeea3ad2aae00767549e2e5c50ad5f2dcfb353cd
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> lib/ubsan.c:27:13: warning: no previous prototype for 'report_ubsan_failure' [-Wmissing-prototypes]
      27 | const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
         |             ^~~~~~~~~~~~~~~~~~~~


vim +/report_ubsan_failure +27 lib/ubsan.c

    20	
    21	#ifdef CONFIG_UBSAN_TRAP
    22	/*
    23	 * Only include matches for UBSAN checks that are actually compiled in.
    24	 * The mappings of struct SanitizerKind (the -fsanitize=xxx args) to
    25	 * SanitizerHandler (the traps) in Clang is in clang/lib/CodeGen/.
    26	 */
  > 27	const char *report_ubsan_failure(struct pt_regs *regs, u32 check_type)
    28	{
    29		switch (check_type) {
    30	#ifdef CONFIG_UBSAN_BOUNDS
    31		/*
    32		 * SanitizerKind::ArrayBounds and SanitizerKind::LocalBounds
    33		 * emit SanitizerHandler::OutOfBounds.
    34		 */
    35		case ubsan_out_of_bounds:
    36			return "UBSAN: array index out of bounds";
    37	#endif
    38	#ifdef CONFIG_UBSAN_SHIFT
    39		/*
    40		 * SanitizerKind::ShiftBase and SanitizerKind::ShiftExponent
    41		 * emit SanitizerHandler::ShiftOutOfBounds.
    42		 */
    43		case ubsan_shift_out_of_bounds:
    44			return "UBSAN: shift out of bounds";
    45	#endif
    46	#ifdef CONFIG_UBSAN_DIV_ZERO
    47		/*
    48		 * SanitizerKind::IntegerDivideByZero emits
    49		 * SanitizerHandler::DivremOverflow.
    50		 */
    51		case ubsan_divrem_overflow:
    52			return "UBSAN: divide/remainder overflow";
    53	#endif
    54	#ifdef CONFIG_UBSAN_UNREACHABLE
    55		/*
    56		 * SanitizerKind::Unreachable emits
    57		 * SanitizerHandler::BuiltinUnreachable.
    58		 */
    59		case ubsan_builtin_unreachable:
    60			return "UBSAN: unreachable code";
    61	#endif
    62	#if defined(CONFIG_UBSAN_BOOL) || defined(CONFIG_UBSAN_ENUM)
    63		/*
    64		 * SanitizerKind::Bool and SanitizerKind::Enum emit
    65		 * SanitizerHandler::LoadInvalidValue.
    66		 */
    67		case ubsan_load_invalid_value:
    68			return "UBSAN: loading invalid value";
    69	#endif
    70	#ifdef CONFIG_UBSAN_ALIGNMENT
    71		/*
    72		 * SanitizerKind::Alignment emits SanitizerHandler::TypeMismatch
    73		 * or SanitizerHandler::AlignmentAssumption.
    74		 */
    75		case ubsan_alignment_assumption:
    76			return "UBSAN: alignment assumption";
    77		case ubsan_type_mismatch:
    78			return "UBSAN: type mismatch";
    79	#endif
    80		default:
    81			return "UBSAN: unrecognized failure code";
    82		}
    83	}
    84	

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