tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1e2a199f6ccdc15cf111d68d212e2fd4ce65682e commit: 56fbacc9bf23d372d78eef3809c1ac93d88e11f4 Merge branches 'arm/renesas', 'arm/qcom', 'arm/mediatek', 'arm/omap', 'arm/exynos', 'arm/smmu', 'ppc/pamu', 'x86/vt-d', 'x86/amd' and 'core' into next date: 6 months ago config: mips-randconfig-r022-20210120 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 22b68440e1647e16b5ee24b924986207173c02d1) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 56fbacc9bf23d372d78eef3809c1ac93d88e11f4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static inline void vop_writel(struct vop uint32_t offset, uint32_t v) ^ fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 16, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 22b68440e1647e16b5ee24b924986207173c02d1) Target: mips-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-22b68440e1/bin clang-12: note: diagnostic msg: Makefile arch drivers include kernel mm scripts source usr -- static inline void dsi_set(struct dw_mipi_dsi_rockchip u32 reg, u32 mask) ^ static inline void dsi_update_bits(struct dw_mipi_dsi_rockchip u32 reg, ^ fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 16, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif' clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 12.0.0 (git://gitmirror/llvm_project 22b68440e1647e16b5ee24b924986207173c02d1) Target: mips-unknown-linux-gnu Thread model: posix InstalledDir: /opt/cross/clang-22b68440e1/bin clang-12: note: diagnostic msg: Makefile arch drivers include kernel mm scripts source usr vim +/vop_writel +185 drivers/gpu/drm/rockchip/rockchip_drm_vop.c 2048e3286f347db5 Mark Yao 2014-08-22 184 2048e3286f347db5 Mark Yao 2014-08-22 @185 static inline void vop_writel(struct vop *vop, uint32_t offset, uint32_t v) 2048e3286f347db5 Mark Yao 2014-08-22 186 { 2048e3286f347db5 Mark Yao 2014-08-22 187 writel(v, vop->regs + offset); 2048e3286f347db5 Mark Yao 2014-08-22 188 vop->regsbak[offset >> 2] = v; 2048e3286f347db5 Mark Yao 2014-08-22 189 } 2048e3286f347db5 Mark Yao 2014-08-22 190 :::::: The code at line 185 was first introduced by commit :::::: 2048e3286f347db5667708e47448176b5329e8d8 drm: rockchip: Add basic drm driver :::::: TO: Mark Yao <mark.yao(a)rock-chips.com&gt; :::::: CC: yzq <yzq(a)rock-chips.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org