tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: cd8c917a56f20f48748dd43d9ae3caff51d5b987 commit: e0c1d53891c43a70c9fa85ddb3174ab5afd7e2ec dmaengine: dw-edma: Add support for the HDMA feature date: 9 months ago config: mips-buildonly-randconfig-r004-20211207 (https://download.01.org/0day-ci/archive/20211207/202112071510.Udt7cE6h-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f50be8eb0a12a61d23db6cda452c693001d76898) 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 e0c1d53891c43a70c9fa85ddb3174ab5afd7e2ec # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/mm/ drivers/dma/dw-edma/ drivers/video/fbdev/savage/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static inline u64 readq_ch(struct dw_edma enum dw_edma_dir dir, u16 ch, ^ fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( 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-14: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 14.0.0 (git://gitmirror/llvm_project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) Target: mips64el-unknown-linux Thread model: posix InstalledDir: /opt/cross/clang-097a1cb1d5/bin clang-14: note: diagnostic msg: Makefile arch drivers include kernel nr_bisected scripts source usr vim +/readq_ch +192 drivers/dma/dw-edma/dw-edma-v0-core.c 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 191 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 @192 static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch, 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 193 const void __iomem *addr) 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 194 { 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 195 u32 value; 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 196 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 197 if (dw->mf == EDMA_MF_EDMA_LEGACY) { 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 198 u32 viewport_sel; 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 199 unsigned long flags; 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 200 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 201 raw_spin_lock_irqsave(&dw->lock, flags); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 202 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 203 viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 204 if (dir == EDMA_DIR_READ) 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 205 viewport_sel |= BIT(31); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 206 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 207 writel(viewport_sel, 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 208 &(__dw_regs(dw)->type.legacy.viewport_sel)); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 209 value = readq(addr); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 210 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 211 raw_spin_unlock_irqrestore(&dw->lock, flags); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 212 } else { 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 213 value = readq(addr); 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 214 } 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 215 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 216 return value; 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 217 } 04e0a39fc10f82 Gustavo Pimentel 2021-02-18 218 :::::: The code at line 192 was first introduced by commit :::::: 04e0a39fc10f82a71b84af73351333b184cee578 dmaengine: dw-edma: Add writeq() and readq() for 64 bits architectures :::::: TO: Gustavo Pimentel <Gustavo.Pimentel(a)synopsys.com&gt; :::::: CC: Vinod Koul <vkoul(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org