Make the PTRACE_SYSEMU checking more robust.  It will make sure that
system call numbers are reported correctly.  If there is a problem, it
will disable PTRACE_SYSEMU use and use PTRACE_SYSCALL instead.

This fixes a hang on boot on FC6 hosts with a broken PTRACE_SYSEMU.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--
 arch/um/os-Linux/start_up.c |   24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)