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

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Message-ID: <20090131005047.GA21022@elte.hu>
Date:	Sat, 31 Jan 2009 01:50:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
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


* H. Peter Anvin <hpa@...or.com> wrote:

> 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?

yeah. This is pretty much the only non-restored frame we construct so 
indeed it would be a singleton. Perhaps the IST ones are such ones too.

> 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.

Sure - your call really.

	Ingo
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