remove global errno from the kernel, make _syscallX kernel-only

Lennert> What I would like to know from each architecture team: - Lennert> What is your arch's policy on userspace usage of Lennert> asm/unistd.h, and consequently, what is your opinion on the Lennert> goal these patches aim for? - Are the changes I made in Lennert> [1] and [2] for your $arch technically correct? Please CC Lennert> me on replies as I'm not on any of the lists posted to.

Lennert> My intention is to push these to Linus for 2.5 if everyone Lennert> agrees. They're probably too intrusive for 2.4 (although Lennert> I'd love people to convince me otherwise).

The patch looks good to me as far as IA-64 Linux is concerned. The syscall() macros exported by asm-ia64/unistd.h were never supported in user level.

Thanks,

	--david