nds32: Only print one page of stack when die to prevent printing too much information.

It may print too much information sometimes if the stack is wrong or
too big. This patch can limit the debug information in a page of stack.
Signed-off-by: NGreentime Hu <greentime@andestech.com>

arch/nds32/kernel/traps.c

@@ -173,11 +173,10 @@ void die(const char *str, struct pt_regs *regs, int err)
 	pr_emerg("CPU: %i\n", smp_processor_id());
 	show_regs(regs);
 	pr_emerg("Process %s (pid: %d, stack limit = 0x%p)\n",
-		 tsk->comm, tsk->pid, task_thread_info(tsk) + 1);
+		 tsk->comm, tsk->pid, end_of_stack(tsk));
 
 	if (!user_mode(regs) || in_interrupt()) {
-		dump_mem("Stack: ", regs->sp,
-			 THREAD_SIZE + (unsigned long)task_thread_info(tsk));
+		dump_mem("Stack: ", regs->sp, (regs->sp + PAGE_SIZE) & PAGE_MASK);
 		dump_instr(regs);
 		dump_stack();
 	}