Hi Barry,

First bad commit (maybe != root cause):

tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 6aa478cf2617c987fcc37cdc8281a4cd310d86d9 commit: a61bf6dd77b6030e05a0caf5cd18ec98f5499d9a [2697/2697] dma-mapping: add benchmark support for streaming DMA APIs config: x86_64-buildonly-randconfig-003-20250110 (https://download.01.org/0day-ci/archive/20250110/202501102124.mb3xJ7Vt-lkp@i...) compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250110/202501102124.mb3xJ7Vt-lkp@i...)

If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot lkp@intel.com | Closes: https://lore.kernel.org/oe-kbuild-all/202501102124.mb3xJ7Vt-lkp@intel.com/

All warnings (new ones prefixed by >>):

...

kernel/dma/map_benchmark.o: warning: objtool: map_benchmark_thread()+0x2a1: unreachable instruction