linux-kernel - [ammarfaizi2-block:arm64/linux/for-next/alternatives 7/9] 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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Message-ID: <202209221916.DuPaZviq-lkp@intel.com>
Date:   Thu, 22 Sep 2022 19:26:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [ammarfaizi2-block:arm64/linux/for-next/alternatives 7/9]
 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://github.com/ammarfaizi2/linux-block arm64/linux/for-next/alternatives
head:   0072dc1b53c39fb7c4cfc5c9e5d5a30622198613
commit: 21fb26bfb01ffe0d9a9a967ffe061092128bbffe [7/9] arm64: alternatives: add alternative_has_feature_*()
config: arm64-buildonly-randconfig-r006-20220921 (https://download.01.org/0day-ci/archive/20220922/202209221916.DuPaZviq-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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://github.com/ammarfaizi2/linux-block/commit/21fb26bfb01ffe0d9a9a967ffe061092128bbffe
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block arm64/linux/for-next/alternatives
        git checkout 21fb26bfb01ffe0d9a9a967ffe061092128bbffe
        # 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>

Note: the ammarfaizi2-block/arm64/linux/for-next/alternatives HEAD 0072dc1b53c39fb7c4cfc5c9e5d5a30622198613 builds fine.
      It only hurts bisectability.

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	

-- 
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https://01.org/lkp