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From: Keith Owens <kaos@ocs.com.au>
To: george@mvista.com
cc: Steven Rostedt <rostedt@goodmis.org>, dwalker@mvista.com,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.13-rc4-V0.7.52-01 
In-reply-to: Your message of "Tue, 02 Aug 2005 18:12:27 MST."
             <42F019FB.1030200@mvista.com> 
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Date: Wed, 03 Aug 2005 11:48:28 +1000
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On Tue, 02 Aug 2005 18:12:27 -0700, 
George Anzinger <george@mvista.com> wrote:
>How about something like:
>	if (current + THREAD_SIZE/sizeof(long) - (regs + sizeof(pt_regs)) > MAGIC)

current points to the current struct task, regs points to the kernel
stack.  Those two data areas can be completely separate, as they are on
i386.  Also i386 uses a separate kernel stack for interrupts.