[sashal-linux-stable:queue-5.4 44/44] arch/riscv/include/asm/processor.h:68:2: error: implicit declaration of function 'barrier'

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

[-- Attachment #1: Type: text/plain, Size: 2808 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4
head:   b2a15cebf1822ff1ce0e390d45202f2231047ee2
commit: b2a15cebf1822ff1ce0e390d45202f2231047ee2 [44/44] compiler.h: fix barrier_data() on clang
config: riscv-allyesconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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/sashal/linux-stable.git/commit/?id=b2a15cebf1822ff1ce0e390d45202f2231047ee2
        git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git
        git fetch --no-tags sashal-linux-stable queue-5.4
        git checkout b2a15cebf1822ff1ce0e390d45202f2231047ee2
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

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

All errors (new ones prefixed by >>):

   In file included from include/linux/prefetch.h:15,
                    from drivers/net/ethernet/emulex/benet/be_main.c:14:
   arch/riscv/include/asm/processor.h: In function 'cpu_relax':
>> arch/riscv/include/asm/processor.h:68:2: error: implicit declaration of function 'barrier' [-Werror=implicit-function-declaration]
      68 |  barrier();
         |  ^~~~~~~
   cc1: some warnings being treated as errors

vim +/barrier +68 arch/riscv/include/asm/processor.h

7db91e57a0acde1 Palmer Dabbelt 2017-07-10  59  
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  60  
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  61  static inline void cpu_relax(void)
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  62  {
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  63  #ifdef __riscv_muldiv
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  64  	int dummy;
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  65  	/* In lieu of a halt instruction, induce a long-latency stall. */
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  66  	__asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  67  #endif
7db91e57a0acde1 Palmer Dabbelt 2017-07-10 @68  	barrier();
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  69  }
7db91e57a0acde1 Palmer Dabbelt 2017-07-10  70  

:::::: The code at line 68 was first introduced by commit
:::::: 7db91e57a0acde126a162ababfb1e0ab190130cb RISC-V: Task implementation

:::::: TO: Palmer Dabbelt <palmer@dabbelt.com>
:::::: CC: Palmer Dabbelt <palmer@dabbelt.com>

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

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 60966 bytes --]