linux-kernel - Re: [RFC][PATCH] irq: support IRQ_NESTED_THREAD with non-threaded interrupt handlers

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Date:	Mon, 7 Jun 2010 23:28:23 +0200
From:	Esben Haabendal <esbenhaabendal@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Esben Haabendal <eha@...edevelopment.dk>, linuxppc-dev@...abs.org,
	Marc Zyngier <maz@...terjones.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	joachim.eastwood@...ron.com, Peter Zijlstra <peterz@...radead.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC][PATCH] irq: support IRQ_NESTED_THREAD with non-threaded 
	interrupt handlers

On Mon, Jun 7, 2010 at 5:06 PM, Thomas Gleixner <tglx@...utronix.de> wrote:

> Maybe you understand now, why I was pretty sure upfront, that your
> approach was wrong even without knowing all the gory details ? :)

I understand.  There is a better solution, which is to use threaded
interrupts where needed.

But I must confess that I am disappointed that you still fail to see
how the pca953x
patch actually eliminates the need for serialization. But I don't
think there is much
point in going on about that.

The phy driver should be rewritten to use a threaded handler, it will
solve my particular problem.
And in the meantime, I have been promised to get the phy interrupts ofloaded
to real CPU interrupt lines :-)

Oh, I still think that the disable_irq_nosync documentaiton is misleading.
Functions that are allowed in a particular context should not call functions
that are not allowed to be called in that context. But now I know :-)

/Esben
-- 
Esben Haabendal, Senior Software Consultant
DoréDevelopment ApS, Ved Stranden 1, 9560 Hadsund, DK-Denmark
Phone: +45 51 92 53 93, E-mail: eha@...edevelopment.dk
WWW: http://www.doredevelopment.dk
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