Documentation: kprobes: Document jprobes stack copying limitations

or in registers.  The jprobe will work in either case, so long as the

handler's prototype matches that of the probed function.

Note that in some architectures (e.g.: arm64 and sparc64) the stack

copy is not done, as the actual location of stacked parameters may be

outside of a reasonable MAX_STACK_SIZE value and because that location

cannot be determined by the jprobes code. In this case the jprobes

user must be careful to make certain the calling signature of the

function does not cause parameters to be passed on the stack (e.g.:

more than eight function arguments, an argument of more than sixteen

bytes, or more than 64 bytes of argument data, depending on

architecture).

1.3 Return Probes

1.3.1 How Does a Return Probe Work?