From: Jeff Dike <jdike@addtoit.com>
      Paolo 'Blaisorblade' Giarrusso<blaisorblade_spam@yahoo.it>

As Jeff Dike noted, even if SYSEMU was originally written for use in SKAS
mode, there is nothing SKAS specific in SYSEMU, so use it for TT mode, too.

SYSEMU simply allows one to ptrace(PTRACE_SYSEMU) a process, that will stop
on the syscall entry path like with PTRACE_SYSCALL, but with the difference
that it makes sure that the syscall execution is totally skipped and that
the child will see the return value set by the ptracer when the child was
stopped.

We even hope that the SYSEMU patch can be merged in mainline sooner than
SKAS.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>