From 3aeb95d5b7839708a8d8e11aa274ee4d0d4042cc Mon Sep 17 00:00:00 2001
From: jia zhang <jia.zhang2008@gmail.com>
Date: Sun, 23 Nov 2008 09:51:41 +0800
Subject: [PATCH] x86_64: fix the check in stack_overflow_check

Impact: make stack overflow debug check and printout narrower

stack_overflow_check() should consider the stack usage of pt_regs, and
thus it could warn us in advance. Additionally, it looks better for
the warning time to start at INITIAL_JIFFIES.

Assuming that rsp gets close to the check point before interrupt
arrives: when interrupt really happens, thread_info will be partly
overrode.

Signed-off-by: jia zhang <jia.zhang2008@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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