linux-kernel - Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

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Date:	Sat, 26 Dec 2009 17:40:29 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Hounschell <markh@...pro.net>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"dmarkh@....rr.com" <dmarkh@....rr.com>,
	Alain Knaff <alain@...ff.lu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"fdutils@...tils.linux.lu" <fdutils@...tils.linux.lu>,
	"Li, Shaohua" <shaohua.li@...el.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

> > Does pmqos work with apci=off etc.? 
> 
> yes
> 
> > I didn't think it shut down
> > the classic "HLT" idle, does it? 
> 
> it does if you specify a latency of 0; it will then go into the
> spin-only state until you give up your latency requirement

I looked at it this evening, but it seems like pm_qos is not
interrupt safe (e.g. calls blocking notifiers) and floppy currently does 
enable/disable_hlt from interrupts and bottom halves.  

Would need some more infrastructure work or restructuring 
of the floppy driver.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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