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Subjectarch/riscv/include/asm/vdso/processor.h:14:2: error: implicit declaration of function 'barrier'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 27bba9c532a8d21050b94224ffd310ad0058c353
commit: 3347acc6fcd4ee71ad18a9ff9d9dac176b517329 compiler.h: fix barrier_data() on clang
date: 7 days ago
config: riscv-randconfig-r003-20201121 (attached as .config)
compiler: riscv32-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/torvalds/linux.git/commit/?id=3347acc6fcd4ee71ad18a9ff9d9dac176b517329
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 3347acc6fcd4ee71ad18a9ff9d9dac176b517329
# 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/vdso/processor.h:10,
from arch/riscv/include/asm/processor.h:11,
from include/linux/prefetch.h:15,
from drivers/net/ethernet/intel/ixgb/ixgb_main.c:6:
arch/riscv/include/asm/vdso/processor.h: In function 'cpu_relax':
>> arch/riscv/include/asm/vdso/processor.h:14:2: error: implicit declaration of function 'barrier' [-Werror=implicit-function-declaration]
14 | barrier();
| ^~~~~~~
cc1: some warnings being treated as errors

vim +/barrier +14 arch/riscv/include/asm/vdso/processor.h

ad5d1122b82fbd6 Vincent Chen 2020-06-09 6
ad5d1122b82fbd6 Vincent Chen 2020-06-09 7 static inline void cpu_relax(void)
ad5d1122b82fbd6 Vincent Chen 2020-06-09 8 {
ad5d1122b82fbd6 Vincent Chen 2020-06-09 9 #ifdef __riscv_muldiv
ad5d1122b82fbd6 Vincent Chen 2020-06-09 10 int dummy;
ad5d1122b82fbd6 Vincent Chen 2020-06-09 11 /* In lieu of a halt instruction, induce a long-latency stall. */
ad5d1122b82fbd6 Vincent Chen 2020-06-09 12 __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
ad5d1122b82fbd6 Vincent Chen 2020-06-09 13 #endif
ad5d1122b82fbd6 Vincent Chen 2020-06-09 @14 barrier();
ad5d1122b82fbd6 Vincent Chen 2020-06-09 15 }
ad5d1122b82fbd6 Vincent Chen 2020-06-09 16

:::::: The code at line 14 was first introduced by commit
:::::: ad5d1122b82fbd6a816d1b9d26ee01a6dbc2d757 riscv: use vDSO common flow to reduce the latency of the time-related functions

:::::: TO: Vincent Chen <vincent.chen@sifive.com>
:::::: CC: Palmer Dabbelt <palmerdabbelt@google.com>

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