linux-kernel - Re: [RFC/PATCH] i386: handle all exceptions with interrupts off initially

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Message-ID: <48C76243.5010206@zytor.com>
Date:	Tue, 09 Sep 2008 22:59:31 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	heukelum@...tmail.fm, linux-kernel@...r.kernel.org, ak@...e.de
Subject: Re: [RFC/PATCH] i386: handle all exceptions with interrupts off	initially

Ingo Molnar wrote:
> 
> the entry paths here are really short (we enable irqs almost 
> immediately) so it's a non-issue in terms of worst-case latencies.
> 
>> In other words, it's not something we want to do "just because", but 
>> to the extent that it provides real benefit, it makes sense.
> 
> this is historically pretty fragile code so bringing the 32-bit and 
> 64-bit variants more in line sounds like a good reason to me. For 
> example we had various long-living irq state annotation bugs (the 
> combination of kprobes and lockdep, etc.) that remained unfixed partly 
> due to this assymetry.
> 

Agreed completely.  I certainly didn't mean to come across sounding 
negative.

	-hpa

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