sys_umount        118 arch/arm64/include/asm/unistd32.h __SYSCALL(__NR_umount2, sys_umount)
sys_umount        406 include/linux/syscalls.h asmlinkage long sys_umount(char __user *name, int flags);
sys_umount        141 include/uapi/asm-generic/unistd.h __SYSCALL(__NR_umount2, sys_umount)
sys_umount        141 tools/include/uapi/asm-generic/unistd.h __SYSCALL(__NR_umount2, sys_umount)