Hi Andre,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.10-rc2 next-20201105]
[cannot apply to arm64/for-next/core kvmarm/next arm-perf/for-next/perf]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Andre-Przywara/ARM-arm64-Add-SMCCC-TRNG-entropy-service/20201105-205934
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4ef8451b332662d004df269d4cdeb7d9f31419b5
config: arm-randconfig-s031-20201105 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-76-gf680124b-dirty
        # https://github.com/0day-ci/linux/commit/1f0c18ec0b7aa0a67d7cdea2b1beb5e7b38c5f4b
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Andre-Przywara/ARM-arm64-Add-SMCCC-TRNG-entropy-service/20201105-205934
        git checkout 1f0c18ec0b7aa0a67d7cdea2b1beb5e7b38c5f4b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/char/random.o: in function `arch_get_random_seed_long':
>> arch/arm/include/asm/archrandom.h:48: undefined reference to `arm_smccc_1_1_get_conduit'
>> arm-linux-gnueabi-ld: arch/arm/include/asm/archrandom.h:48: undefined reference to `smccc_trng_available'

vim +48 arch/arm/include/asm/archrandom.h

    42	
    43	static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
    44	{
    45		struct arm_smccc_res res;
    46	
    47		if (smccc_trng_available) {
  > 48			arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_RND32, 8 * sizeof(*v), &res);
    49	
    50			if (res.a0 != 0)
    51				return false;
    52	
    53			*v = res.a3;
    54			return true;
    55		}
    56	
    57		return false;
    58	}
    59	

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