[ogabbay:gaudi2 59/61] drivers/misc/habanalabs/common/mmu/mmu.c:785: Error: unrecognized opcode `mfence'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git gaudi2
head:   a76819ab38942fcb341142a55e9dc81f3eaf08e3
commit: 950d1a3888fe751fb5b2e51a44ebf89d963fdde5 [59/61] habanalabs: add gaudi2 MMU support
config: riscv-randconfig-c023-20220627 (https://download.01.org/0day-ci/archive/20220628/202206281642.qItsyHKa-lkp@xxxxxxxxx/config)
compiler: riscv64-linux-gcc (GCC) 11.3.0
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/ogabbay/linux.git/commit/?id=950d1a3888fe751fb5b2e51a44ebf89d963fdde5
        git remote add ogabbay https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git
        git fetch --no-tags ogabbay gaudi2
        git checkout 950d1a3888fe751fb5b2e51a44ebf89d963fdde5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/misc/

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

All errors (new ones prefixed by >>):

   drivers/misc/habanalabs/common/mmu/mmu.c: Assembler messages:
>> drivers/misc/habanalabs/common/mmu/mmu.c:785: Error: unrecognized opcode `mfence'


vim +785 drivers/misc/habanalabs/common/mmu/mmu.c

   780	
   781	void hl_mmu_hr_flush(struct hl_ctx *ctx)
   782	{
   783		/* a flush operation requires memory barrier */
   784		mb();
 > 785		asm volatile ("mfence" : : : "memory");
   786	}
   787	

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https://01.org/lkp