[linux-next:master 1487/10701] drivers/firmware/arm_scmi/smc.c:109:2: error: write to reserved register 'R7'

[kbuild test robot]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8
commit: 1dc6558062dadfabd2fb3bd885fa6e92ec7196f2 [1487/10701] firmware: arm_scmi: Add smc/hvc transport
config: arm-randconfig-r005-20200519 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3)
reproduce:
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
git checkout 1dc6558062dadfabd2fb3bd885fa6e92ec7196f2
# 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: kbuild test robot <l...@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/firmware/arm_scmi/smc.c:109:2: error: write to reserved register 'R7'
arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
^
include/linux/arm-smccc.h:357:4: note: expanded from macro 'arm_smccc_1_1_invoke'
arm_smccc_1_1_smc(__VA_ARGS__); ^
include/linux/arm-smccc.h:299:48: 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:176:24: 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) "nt"
^
>> drivers/firmware/arm_scmi/smc.c:109:2: error: write to reserved register 'R7'
include/linux/arm-smccc.h:354:4: note: expanded from macro 'arm_smccc_1_1_invoke'
arm_smccc_1_1_hvc(__VA_ARGS__); ^
include/linux/arm-smccc.h:315:48: 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:177:24: 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) "nt"
^
>> drivers/firmware/arm_scmi/smc.c:109:2: error: write to reserved register 'R7'
include/linux/arm-smccc.h:360:4: note: expanded from macro 'arm_smccc_1_1_invoke'
__fail_smccc_1_1(__VA_ARGS__); ^
include/linux/arm-smccc.h:330:8: note: expanded from macro '__fail_smccc_1_1'
asm ("" __constraints(__count_args(__VA_ARGS__))); ^
3 errors generated.

vim +/R7 +109 drivers/firmware/arm_scmi/smc.c

98
99 static int smc_send_message(struct scmi_chan_info *cinfo,
100 struct scmi_xfer *xfer)
101 {
102 struct scmi_smc *scmi_info = cinfo->transport_info;
103 struct arm_smccc_res res;
104
105 mutex_lock(&smc_mutex);
106
107 shmem_tx_prepare(scmi_info->shmem, xfer);
108
> 109 arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
110 scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem));
111
112 mutex_unlock(&smc_mutex);
113
114 return res.a0;
115 }
116

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuil...@lists.01.org

[Nick Desaulniers]

On Tue, May 19, 2020 at 12:00 PM kbuild test robot <l...@intel.com> wrote:
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8
> commit: 1dc6558062dadfabd2fb3bd885fa6e92ec7196f2 [1487/10701] firmware: arm_scmi: Add smc/hvc transport
> config: arm-randconfig-r005-20200519 (attached as .config)
> compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3)
> reproduce:
> 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
> git checkout 1dc6558062dadfabd2fb3bd885fa6e92ec7196f2
> # 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: kbuild test robot <l...@intel.com>
>
> All errors (new ones prefixed by >>, old ones prefixed by <<):
>
> >> drivers/firmware/arm_scmi/smc.c:109:2: error: write to reserved register 'R7'
> arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);
> ^

Nevermind this warning. I'm actually on a call right now with ARM
discussing this. Issue is specific to thumb.

> --
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--
Thanks,
~Nick Desaulniers