sys_gettid        462 arch/arm64/include/asm/unistd32.h __SYSCALL(__NR_gettid, sys_gettid)
sys_gettid        749 include/linux/syscalls.h asmlinkage long sys_gettid(void);
sys_gettid        534 include/uapi/asm-generic/unistd.h __SYSCALL(__NR_gettid, sys_gettid)
sys_gettid        534 tools/include/uapi/asm-generic/unistd.h __SYSCALL(__NR_gettid, sys_gettid)
sys_gettid         34 tools/testing/selftests/proc/thread-self.c 	tid = sys_gettid();