Incorrect preadv/pwritev argument parsing on ARM EABI

[Dima Kogan]

Dmitry V. Levin <ldv at altlinux.org> writes:

> Unfortunately, your patch breaks all 64-bit architectures because offset
> is passed as a single argument

Oh yeah. I clearly broke that; sorry about that. We want to parse preadv
and pwritev in exactly the same way we parse llseek. That syscall does
the same arg splitting. Its code looks very similar, so after 30 seconds
of looking at it I'm not yet sure why that works. I'll look more closely
later tonight.

dima