don't know if the following is already queued, it fixes an ARCH=um build
failure, evidence here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=115875912525137&w=2
and following thread.
Cc-ing uml maintainers and I hope I didn't follow too many
Submitting-patches rules...

The patch is taken from:
http://user-mode-linux.sourceforge.net/work/current/2.6/2.6.18/patches/no-syscallx

Since the syscallx macros seem to be under threat, this patch stops
using them, using syscall instead.
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>