seccomp: Add a seccomp_data parameter secure_computing()

Currently, if arch code wants to supply seccomp_data directly to
seccomp (which is generally much faster than having seccomp do it
using the syscall_get_xyz() API), it has to use the two-phase
seccomp hooks. Add it to the easy hooks, too.

Cc: linux-arch@vger.kernel.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>

arch/tile/kernel/ptrace.c

@@ -255,7 +255,7 @@ int do_syscall_trace_enter(struct pt_regs *regs)
 {
 	u32 work = ACCESS_ONCE(current_thread_info()->flags);
 
-	if (secure_computing() == -1)
+	if (secure_computing(NULL) == -1)
 		return -1;
 
 	if (work & _TIF_SYSCALL_TRACE) {