Re: [PATCH RT] ehea: make receive irq handler non-threaded(IRQF_NODELAY)

From: Michael Ellerman
Date: Tue May 18 2010 - 21:25:55 EST

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.


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