[openeuler:OLK-5.10 4858/30000] arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r0' in asm - Kernel

13 Sep 2024


      tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   8f53b22e47e98837db7830541a369ed0cd5df749
commit: 78d8f4f7a298a5d259b2163121ea20b9e60e93f7 [4858/30000] arm64: Add support for SMCCC TRNG entropy source
config: arm64-randconfig-001-20240913 (https://download.01.org/0day-ci/archive/20240913/202409131014.4Rr9vQO0-lkp@i...)
compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240913/202409131014.4Rr9vQO0-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/202409131014.4Rr9vQO0-lkp@intel.com/
All errors (new ones prefixed by >>):
arch/arm64/Makefile:44: Detected assembler with broken .inst; disassembly will be unreliable
   arch/arm64/Makefile:44: Detected assembler with broken .inst; disassembly will be unreliable
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:17:
   In file included from include/linux/lockdep.h:14:
   In file included from include/linux/smp.h:102:
   In file included from include/linux/preempt.h:78:
   In file included from arch/arm64/include/asm/preempt.h:5:
   In file included from include/linux/thread_info.h:14:
   In file included from include/linux/thread_bits.h:32:
   In file included from arch/arm64/include/asm/thread_info.h:18:
   arch/arm64/include/asm/stack_pointer.h:8:51: error: register 'sp' unsuitable for global register variables on this target
   register unsigned long current_stack_pointer asm ("sp");
                                                     ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r0' in asm
arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_VERSION, &res);
           ^
   include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:336:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r0 asm("r0");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r1' in asm
include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:337:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r1 asm("r1");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r2' in asm
include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:338:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r2 asm("r2");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r3' in asm
include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:339:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r3 asm("r3");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r0' in asm
include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:340:3: note: expanded from macro '__arm_smccc_1_1'
                   __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
                   ^
   note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/arm-smccc.h:321:37: note: expanded from macro '___declare_args'
   #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
                                       ^
   <scratch space>:8:1: note: expanded from here
   __declare_arg_0
   ^
   include/linux/arm-smccc.h:275:34: note: expanded from macro '__declare_arg_0'
           register unsigned long arg0 asm("r0") = (u32)a0
                                           ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r0' in asm
include/linux/arm-smccc.h:415:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_smc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:362:32: 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:336:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r0 asm("r0");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r1' in asm
include/linux/arm-smccc.h:415:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_smc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:362:32: 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:337:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r1 asm("r1");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r2' in asm
include/linux/arm-smccc.h:415:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_smc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:362:32: 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:338:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r2 asm("r2");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r3' in asm
include/linux/arm-smccc.h:415:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_smc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:362:32: 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:339:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r3 asm("r3");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r0' in asm
include/linux/arm-smccc.h:415:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_smc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:362:32: 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:340:3: note: expanded from macro '__arm_smccc_1_1'
                   __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
                   ^
   note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/arm-smccc.h:321:37: note: expanded from macro '___declare_args'
   #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
                                       ^
   <scratch space>:10:1: note: expanded from here
   __declare_arg_0
   ^
   include/linux/arm-smccc.h:275:34: note: expanded from macro '__declare_arg_0'
           register unsigned long arg0 asm("r0") = (u32)a0
                                           ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
...
...
arch/arm64/include/asm/archrandom.h:20:2: error: unknown register name 'r0' in asm
include/linux/arm-smccc.h:418:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           __fail_smccc_1_1(__VA_ARGS__);                  \
                           ^
   include/linux/arm-smccc.h:387:3: note: expanded from macro '__fail_smccc_1_1'
                   __declare_args(__count_args(__VA_ARGS__), __VA_ARGS__); \
                   ^
   include/linux/arm-smccc.h:322:37: note: expanded from macro '__declare_args'
   #define __declare_args(count, ...)  ___declare_args(count, __VA_ARGS__)
                                       ^
   include/linux/arm-smccc.h:321:37: note: expanded from macro '___declare_args'
   #define ___declare_args(count, ...) __declare_arg_ ## count(__VA_ARGS__)
                                       ^
   <scratch space>:12:1: note: expanded from here
   __declare_arg_0
   ^
   include/linux/arm-smccc.h:275:34: note: expanded from macro '__declare_arg_0'
           register unsigned long arg0 asm("r0") = (u32)a0
                                           ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
   arch/arm64/include/asm/archrandom.h:66:3: error: unknown register name 'r0' in asm
                   arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_RND64, 64, &res);
                   ^
   include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:336:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r0 asm("r0");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
   arch/arm64/include/asm/archrandom.h:66:3: error: unknown register name 'r1' in asm
   include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:337:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r1 asm("r1");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
   In file included from include/linux/sysfs.h:17:
   In file included from include/linux/kernfs.h:13:
   In file included from include/linux/mutex.h:19:
   In file included from arch/arm64/include/asm/processor.h:45:
   In file included from arch/arm64/include/asm/pointer_auth.h:6:
   In file included from include/linux/random.h:121:
   arch/arm64/include/asm/archrandom.h:66:3: error: unknown register name 'r2' in asm
   include/linux/arm-smccc.h:412:4: note: expanded from macro 'arm_smccc_1_1_invoke'
                           arm_smccc_1_1_hvc(__VA_ARGS__);                 \
                           ^
   include/linux/arm-smccc.h:378:32: 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:338:33: note: expanded from macro '__arm_smccc_1_1'
                   register unsigned long r2 asm("r2");                    \
                                                 ^
   In file included from arch/arm64/kernel/asm-offsets.c:10:
   In file included from include/linux/arm_sdei.h:8:
   In file included from include/acpi/ghes.h:5:
   In file included from include/acpi/apei.h:9:
   In file included from include/linux/acpi.h:13:
   In file included from include/linux/irqdomain.h:35:
   In file included from include/linux/of.h:17:
   In file included from include/linux/kobject.h:21:
vim +/r0 +20 arch/arm64/include/asm/archrandom.h
15	
    16	static inline bool __init smccc_probe_trng(void)
    17	{
    18		struct arm_smccc_res res;
    19
...
20		arm_smccc_1_1_invoke(ARM_SMCCC_TRNG_VERSION, &res);
21		if ((s32)res.a0 < 0)
    22			return false;
    23	
    24		return res.a0 >= ARM_SMCCC_TRNG_MIN_VERSION;
    25	}
    26
-- 
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https://github.com/intel/lkp-tests/wiki