Hi Tom, FYI, the error/warning still remains. tree: https://github.com/atishp04/linux dma_non_coherent_test head: b6a8eeec059715370d35fdb32c8c3fe41e2b69c1 commit: e0d5ab480cafc73def31f4dd297f854bad07dcb8 [6/48] sifive/sifive_l2_cache: Add sifive_l2_flush64_range function config: riscv-randconfig-r005-20210615 (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://github.com/atishp04/linux/commit/e0d5ab480cafc73def31f4dd297f854b... git remote add atishp04 https://github.com/atishp04/linux git fetch --no-tags atishp04 dma_non_coherent_test git checkout e0d5ab480cafc73def31f4dd297f854bad07dcb8 # 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(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/soc/sifive/sifive_l2_cache.c: In function 'sifive_l2_flush64_range': 151 | writeq(line, l2_base + SIFIVE_L2_FLUSH64); | ^~~~~~ | writeb cc1: some warnings being treated as errors Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for LOCKDEP Depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT && (FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86) Selected by - LOCK_STAT && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT - DEBUG_LOCK_ALLOC && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT vim +151 drivers/soc/sifive/sifive_l2_cache.c 122 123 #ifdef CONFIG_SIFIVE_L2_FLUSH 124 void sifive_l2_flush64_range(unsigned long start, unsigned long len) 125 { 126 unsigned long line; 127 128 if(!l2_base) { 129 pr_warn("L2CACHE: base addr invalid, skipping flush\n"); 130 return; 131 } 132 133 /* TODO: if (len == 0), skipping flush or going on? */ 134 if(!len) { 135 pr_debug("L2CACHE: flush64 range @ 0x%lx(len:0)\n", start); 136 return; 137 } 138 139 /* make sure the address is in the range */ 140 if(start < CONFIG_SIFIVE_L2_FLUSH_START || 141 (start + len) > (CONFIG_SIFIVE_L2_FLUSH_START + 142 CONFIG_SIFIVE_L2_FLUSH_SIZE)) { 143 pr_warn("L2CACHE: flush64 out of range: %lx(%lx), skip flush\n", 144 start, len); 145 return; 146 } 147 148 mb(); /* sync */ 149 for (line = start; line < start + len; 150 line += SIFIVE_L2_FLUSH64_LINE_LEN) { 152 mb(); 153 } 154 } 155 EXPORT_SYMBOL_GPL(sifive_l2_flush64_range); 156 #endif 157 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org