linux-kernel - [ammarfaizi2-block:google/android/kernel/common/android13-5.10 9980/9999] kernel/cfi.c:334:6: warning: no previous prototype for function '__cfi

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Date:   Fri, 28 Jan 2022 09:05:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...weeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:google/android/kernel/common/android13-5.10
 9980/9999] kernel/cfi.c:334:6: warning: no previous prototype for function
 '__cfi_slowpath'

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android13-5.10
head:   7edc8bc69d7def26c4528360c9ec96dbeadcd0a1
commit: e48efff5cb5fd63a687465347bdbb52ef98dad44 [9980/9999] ANDROID: arch/Kconfig: fix up LTO LLVM_IAS depdency
config: arm64-buildonly-randconfig-r006-20220127 (https://download.01.org/0day-ci/archive/20220128/202201280858.mQTzGZcJ-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f32dccb9a43b02ce4e540d6ba5dbbdb188f2dc7d)
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/e48efff5cb5fd63a687465347bdbb52ef98dad44
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android13-5.10
        git checkout e48efff5cb5fd63a687465347bdbb52ef98dad44
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> kernel/cfi.c:334:6: warning: no previous prototype for function '__cfi_slowpath' [-Wmissing-prototypes]
   void cfi_slowpath_handler(uint64_t id, void *ptr, void *diag)
        ^
   kernel/cfi.c:25:30: note: expanded from macro 'cfi_slowpath_handler'
   #define cfi_slowpath_handler    __cfi_slowpath
                                   ^
   kernel/cfi.c:334:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void cfi_slowpath_handler(uint64_t id, void *ptr, void *diag)
   ^
   static 
   kernel/cfi.c:343:6: warning: no previous prototype for function '__ubsan_handle_cfi_check_fail_abort' [-Wmissing-prototypes]
   void cfi_failure_handler(void *data, void *ptr, void *vtable)
        ^
   kernel/cfi.c:24:29: note: expanded from macro 'cfi_failure_handler'
   #define cfi_failure_handler     __ubsan_handle_cfi_check_fail_abort
                                   ^
   kernel/cfi.c:343:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void cfi_failure_handler(void *data, void *ptr, void *vtable)
   ^
   static 
>> kernel/cfi.c:349:6: warning: no previous prototype for function '__cfi_check_fail' [-Wmissing-prototypes]
   void __cfi_check_fail(void *data, void *ptr)
        ^
   kernel/cfi.c:349:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __cfi_check_fail(void *data, void *ptr)
   ^
   static 
   3 warnings generated.


vim +/__cfi_slowpath +334 kernel/cfi.c

2c351bb70ac5e5 Sami Tolvanen 2019-04-25  333  
2c351bb70ac5e5 Sami Tolvanen 2019-04-25 @334  void cfi_slowpath_handler(uint64_t id, void *ptr, void *diag)
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  335  {
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  336  	handle_cfi_failure(ptr); /* No modules */
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  337  }
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  338  
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  339  #endif /* CONFIG_MODULES */
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  340  
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  341  EXPORT_SYMBOL(cfi_slowpath_handler);
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  342  
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  343  void cfi_failure_handler(void *data, void *ptr, void *vtable)
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  344  {
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  345  	handle_cfi_failure(ptr);
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  346  }
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  347  EXPORT_SYMBOL(cfi_failure_handler);
2c351bb70ac5e5 Sami Tolvanen 2019-04-25  348  
2c351bb70ac5e5 Sami Tolvanen 2019-04-25 @349  void __cfi_check_fail(void *data, void *ptr)

:::::: The code at line 334 was first introduced by commit
:::::: 2c351bb70ac5e5212f247a495199042a95b43e38 ANDROID: add support for Clang's Control Flow Integrity (CFI)

:::::: TO: Sami Tolvanen <samitolvanen@...gle.com>
:::::: CC: Alistair Delva <adelva@...gle.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org