Use helpers to obtain task pid in printks (arch code)

One of the easiest things to isolate is the pid printed in kernel log.
There was a patch, that made this for arch-independent code, this one makes
so for arch/xxx files.

It took some time to cross-compile it, but hopefully these are all the
printks in arch code.

Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/sparc/kernel/sys_sparc.c

@@ -357,7 +357,7 @@ c_sys_nis_syscall (struct pt_regs *regs)
 	if (count++ > 5)
 		return -ENOSYS;
 	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
-		current->comm, current->pid, (int)regs->u_regs[1]);
+		current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
 #ifdef DEBUG_UNIMP_SYSCALL	
 	show_regs (regs);
 #endif