Hi Michael, Thank you for the patch! Yet something to improve: [auto build test ERROR on drm-intel/for-linux-next] [also build test ERROR on drm-tip/drm-tip drm/drm-next v5.17-rc3 next-20220207] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Michael-Cheng/Use-drm_clflush-instead-of-clflush/20220208-041326 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: arm64-defconfig (https://download.01.org/0day-ci/archive/20220208/202202081258.VY7Y7JnA-lkp@xxxxxxxxx/config) compiler: aarch64-linux-gcc (GCC) 11.2.0 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/0day-ci/linux/commit/f2fb6ade1531d88b046e245e8b854a7422a05a14 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Michael-Cheng/Use-drm_clflush-instead-of-clflush/20220208-041326 git checkout f2fb6ade1531d88b046e245e8b854a7422a05a14 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All error/warnings (new ones prefixed by >>): drivers/gpu/drm/drm_cache.c: In function 'drm_clflush_virt_range': >> drivers/gpu/drm/drm_cache.c:182:32: warning: dereferencing 'void *' pointer 182 | flush_tlb_kernel_range(*addr, *end); | ^~~~~ drivers/gpu/drm/drm_cache.c:182:39: warning: dereferencing 'void *' pointer 182 | flush_tlb_kernel_range(*addr, *end); | ^~~~ >> drivers/gpu/drm/drm_cache.c:182:32: error: invalid use of void expression 182 | flush_tlb_kernel_range(*addr, *end); | ^~~~~ drivers/gpu/drm/drm_cache.c:182:39: error: invalid use of void expression 182 | flush_tlb_kernel_range(*addr, *end); | ^~~~ vim +182 drivers/gpu/drm/drm_cache.c 151 152 /** 153 * drm_clflush_virt_range - Flush dcache lines of a region 154 * @addr: Initial kernel memory address. 155 * @length: Region size. 156 * 157 * Flush every data cache line entry that points to an address in the 158 * region requested. 159 */ 160 void 161 drm_clflush_virt_range(void *addr, unsigned long length) 162 { 163 #if defined(CONFIG_X86) 164 if (static_cpu_has(X86_FEATURE_CLFLUSH)) { 165 const int size = boot_cpu_data.x86_clflush_size; 166 void *end = addr + length; 167 168 addr = (void *)(((unsigned long)addr) & -size); 169 mb(); /*CLFLUSH is only ordered with a full memory barrier*/ 170 for (; addr < end; addr += size) 171 clflushopt(addr); 172 clflushopt(end - 1); /* force serialisation */ 173 mb(); /*Ensure that every data cache line entry is flushed*/ 174 return; 175 } 176 177 if (wbinvd_on_all_cpus()) 178 pr_err("Timed out waiting for cache flush\n"); 179 180 #elif defined(CONFIG_ARM64) 181 void *end = addr + length; > 182 flush_tlb_kernel_range(*addr, *end); 183 #else 184 pr_err("Architecture has no drm_cache.c support\n"); 185 WARN_ON_ONCE(1); 186 #endif 187 } 188 EXPORT_SYMBOL(drm_clflush_virt_range); 189 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
