Note that
ftime(3),
profil(3)
and
ulimit(3)
are implemented as library functions.
Some system calls, like
alloc_hugepages(2),
free_hugepages(2),
ioperm(2),
iopl(2),
and
vm86(2)
only exist on certain architectures.
Some system calls, like
ipc(2),
create_module(2),
init_module(2),
and
delete_module(2)
only exist when the Linux kernel was built with support for them.