linux-kernel - [mark:arm64/alternatives/rework 8/12] arch/arm64/include/asm/alternative-macros.h:224:2: error: call to undeclared function 'BUILD_BUG_ON'; ISO C99 and later do not support implicit function declarations

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Date:   Tue, 23 Aug 2022 14:09:35 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mark:arm64/alternatives/rework 8/12]
 arch/arm64/include/asm/alternative-macros.h:224:2: error: call to undeclared
 function 'BUILD_BUG_ON'; ISO C99 and later do not support implicit function
 declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/alternatives/rework
head:   c6f1e900bb0e1c5932f9995feaf4acb70cf6f62e
commit: 1696b807a602e836898825b7fff3691438b90f39 [8/12] arm64: alternative: add alternative_has_feature_*()
config: arm64-randconfig-r026-20220821 (https://download.01.org/0day-ci/archive/20220823/202208231413.qMjHMepE-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project b04d01c009d7f66bcca9138d2ce40999eedf104d)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=1696b807a602e836898825b7fff3691438b90f39
        git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
        git fetch --no-tags mark arm64/alternatives/rework
        git checkout 1696b807a602e836898825b7fff3691438b90f39
        # 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=arm64 prepare

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

All errors (new ones prefixed by >>):

   In file included from kernel/bounds.c:10:
   In file included from include/linux/page-flags.h:10:
   In file included from include/linux/bug.h:5:
   In file included from arch/arm64/include/asm/bug.h:26:
   In file included from include/asm-generic/bug.h:5:
   In file included from include/linux/compiler.h:248:
   In file included from arch/arm64/include/asm/rwonce.h:11:
>> arch/arm64/include/asm/alternative-macros.h:224:2: error: call to undeclared function 'BUILD_BUG_ON'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           BUILD_BUG_ON(feature >= ARM64_NCAPS);
           ^
   arch/arm64/include/asm/alternative-macros.h:241:2: error: call to undeclared function 'BUILD_BUG_ON'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           BUILD_BUG_ON(feature >= ARM64_NCAPS);
           ^
   2 errors generated.
   make[2]: *** [scripts/Makefile.build:117: kernel/bounds.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1205: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:222: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/BUILD_BUG_ON +224 arch/arm64/include/asm/alternative-macros.h

   220	
   221	static __always_inline bool
   222	alternative_has_feature_likely(unsigned long feature)
   223	{
 > 224		BUILD_BUG_ON(feature >= ARM64_NCAPS);
   225	
   226		asm_volatile_goto(
   227		ALTERNATIVE("b	%l[l_no]", "nop", %[feature])
   228		:
   229		: [feature] "i" (feature)
   230		:
   231		: l_no);
   232	
   233		return true;
   234	l_no:
   235		return false;
   236	}
   237	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp