user_syscall_nr    28 tools/testing/selftests/powerpc/ptrace/ptrace-syscall.c #define user_syscall_nr	gpr[0]
user_syscall_nr    20 tools/testing/selftests/x86/ptrace_syscall.c # define user_syscall_nr	orig_rax
user_syscall_nr    30 tools/testing/selftests/x86/ptrace_syscall.c # define user_syscall_nr	orig_eax