linux-kernel - Re: [PATCH] x86: push old stack address on irqstack for unwinder

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Date:	Fri, 30 Jan 2009 16:47:50 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Martin Hicks <mort@....com>, tglx@...utronix.de, mingo@...hat.com,
	heukelum@...lshack.com, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: push old stack address on irqstack for unwinder

Ingo Molnar wrote:
> 
> Would be nice to have an #ifdef-less primitive for this - something like:
> 
> 	pushq_frame %rbp
> 
> and a matching:
> 
> 	popq_frame %rbp
> 
> for those cases that need it (this one doesnt as we dont pop out of the 
> stack).
> 

It certainly would if this isn't a singleton, which I think it could 
possibly be?

Otherwise it really should be a part of an entry/exit macro; this is 
somewhat special in that it sets up a frame pointer as something other 
than a normal entry/exit sequence.

	-hpa
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