linux-kernel - Re: [PATCH RT] ehea: make receive irq handler non-threaded (IRQF

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Date:	Wed, 19 May 2010 11:25:24 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Darren Hart <dvhltc@...ibm.com>
Cc:	Brian King <brking@...ux.vnet.ibm.com>,
	Jan-Bernd Themann <themann@...ibm.com>,
	dvhltc@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	niv@...ux.vnet.ibm.com, Thomas Gleixner <tglx@...utronix.de>,
	Doug Maxey <doug.maxey@...ibm.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH RT] ehea: make receive irq handler non-threaded
 (IRQF_NODELAY)

On Tue, 2010-05-18 at 15:22 -0700, Darren Hart wrote:
> On 05/18/2010 02:52 PM, Brian King wrote:
> > Is IRQF_NODELAY something specific to the RT kernel? I don't see it in mainline...
> 
> Yes, it basically says "don't make this handler threaded".

That is a good fix for EHEA, but the threaded handling is still broken
for anything else that is edge triggered isn't it?

The result of the discussion about two years ago on this was that we
needed a custom flow handler for XICS on RT.

Apart from the issue of loosing interrupts there is also the fact that
masking on the XICS requires an RTAS call which takes a global lock.

cheers



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