[kbuild-all] drivers/firmware/arm_scmi/smc.c:113:2: error: write to reserved register 'R7'

Hi Sudeep, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a74e6a014c9d4d4161061f770c9b4f98372ac778 commit: 66d90f6ecee755e9c19a119c9255e80091165498 firmware: arm_scmi: Enable building as a single module date: 6 months ago config: arm-randconfig-r005-20210311 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 574a9dabc63ba1e7a04c08d4bde2eacd61b44ce1) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # 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 66d90f6ecee755e9c19a119c9255e80091165498 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); ^ include/linux/arm-smccc.h:396:4: note: expanded from macro 'arm_smccc_1_1_invoke' arm_smccc_1_1_smc(__VA_ARGS__); \ ^ include/linux/arm-smccc.h:343:48: note: expanded from macro 'arm_smccc_1_1_smc' #define arm_smccc_1_1_smc(...) __arm_smccc_1_1(SMCCC_SMC_INST, __VA_ARGS__) ^ include/linux/arm-smccc.h:220:24: note: expanded from macro 'SMCCC_SMC_INST' #define SMCCC_SMC_INST __SMC(0) ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) arch/arm/include/asm/opcodes.h:210:2: note: expanded from macro '__inst_arm_thumb32' __inst_thumb32(thumb_opcode) ^ arch/arm/include/asm/opcodes.h:200:27: note: expanded from macro '__inst_thumb32' #define __inst_thumb32(x) ___inst_thumb32( \ ^ arch/arm/include/asm/opcodes.h:225:2: note: expanded from macro '___inst_thumb32' ".short " __stringify(first) ", " __stringify(second) "\n\t" ^ include/linux/arm-smccc.h:393:4: note: expanded from macro 'arm_smccc_1_1_invoke' arm_smccc_1_1_hvc(__VA_ARGS__); \ ^ include/linux/arm-smccc.h:359:48: note: expanded from macro 'arm_smccc_1_1_hvc' #define arm_smccc_1_1_hvc(...) __arm_smccc_1_1(SMCCC_HVC_INST, __VA_ARGS__) ^ include/linux/arm-smccc.h:221:24: note: expanded from macro 'SMCCC_HVC_INST' #define SMCCC_HVC_INST __HVC(0) ^ note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) arch/arm/include/asm/opcodes.h:210:2: note: expanded from macro '__inst_arm_thumb32' __inst_thumb32(thumb_opcode) ^ arch/arm/include/asm/opcodes.h:200:27: note: expanded from macro '__inst_thumb32' #define __inst_thumb32(x) ___inst_thumb32( \ ^ arch/arm/include/asm/opcodes.h:225:2: note: expanded from macro '___inst_thumb32' ".short " __stringify(first) ", " __stringify(second) "\n\t" ^ include/linux/arm-smccc.h:399:4: note: expanded from macro 'arm_smccc_1_1_invoke' __fail_smccc_1_1(__VA_ARGS__); \ ^ include/linux/arm-smccc.h:369:8: note: expanded from macro '__fail_smccc_1_1' asm ("" __constraints(__count_args(__VA_ARGS__))); \ ^ 3 errors generated. vim +/R7 +113 drivers/firmware/arm_scmi/smc.c 1dc6558062dadf Peng Fan 2020-03-08 102 1dc6558062dadf Peng Fan 2020-03-08 103 static int smc_send_message(struct scmi_chan_info *cinfo, 1dc6558062dadf Peng Fan 2020-03-08 104 struct scmi_xfer *xfer) 1dc6558062dadf Peng Fan 2020-03-08 105 { 1dc6558062dadf Peng Fan 2020-03-08 106 struct scmi_smc *scmi_info = cinfo->transport_info; 1dc6558062dadf Peng Fan 2020-03-08 107 struct arm_smccc_res res; 1dc6558062dadf Peng Fan 2020-03-08 108 18988265b87615 Sudeep Holla 2020-03-27 109 mutex_lock(&scmi_info->shmem_lock); 1dc6558062dadf Peng Fan 2020-03-08 110 1dc6558062dadf Peng Fan 2020-03-08 111 shmem_tx_prepare(scmi_info->shmem, xfer); 1dc6558062dadf Peng Fan 2020-03-08 112 1dc6558062dadf Peng Fan 2020-03-08 @113 arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res); 1dc6558062dadf Peng Fan 2020-03-08 114 scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem)); 1dc6558062dadf Peng Fan 2020-03-08 115 18988265b87615 Sudeep Holla 2020-03-27 116 mutex_unlock(&scmi_info->shmem_lock); 1dc6558062dadf Peng Fan 2020-03-08 117 f7199cf489027a Sudeep Holla 2020-04-17 118 /* Only SMCCC_RET_NOT_SUPPORTED is valid error code */ f7199cf489027a Sudeep Holla 2020-04-17 119 if (res.a0) f7199cf489027a Sudeep Holla 2020-04-17 120 return -EOPNOTSUPP; f7199cf489027a Sudeep Holla 2020-04-17 121 return 0; 1dc6558062dadf Peng Fan 2020-03-08 122 } 1dc6558062dadf Peng Fan 2020-03-08 123 :::::: The code at line 113 was first introduced by commit :::::: 1dc6558062dadfabd2fb3bd885fa6e92ec7196f2 firmware: arm_scmi: Add smc/hvc transport :::::: TO: Peng Fan <peng.fan(a)nxp.com&gt; :::::: CC: Sudeep Holla <sudeep.holla(a)arm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org