From: Michael Ellerman <michael@ellerman.id.au>
To: Darren Hart <dvhltc@us.ibm.com>
Cc: Jan-Bernd Themann <themann@de.ibm.com>,
dvhltc@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
Will Schmidt <will_schmidt@vnet.ibm.com>,
Brian King <brking@linux.vnet.ibm.com>,
niv@linux.vnet.ibm.com, Thomas Gleixner <tglx@linutronix.de>,
Doug Maxey <doug.maxey@us.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH RT] ehea: make receive irq handler non-threaded (IRQF_NODELAY)
Date: Wed, 19 May 2010 11:25:24 +1000 [thread overview]
Message-ID: <1274232324.29980.9.camel@concordia> (raw)
In-Reply-To: <4BF31322.5090206@us.ibm.com>
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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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next prev parent reply other threads:[~2010-05-19 1:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4BF30793.5070300@us.ibm.com>
2010-05-18 21:52 ` [PATCH RT] ehea: make receive irq handler non-threaded (IRQF_NODELAY) Brian King
2010-05-18 22:19 ` Nivedita Singhvi
2010-05-18 22:22 ` Darren Hart
2010-05-19 1:25 ` Michael Ellerman [this message]
2010-05-19 14:16 ` Darren Hart
2010-05-19 14:38 ` Thomas Gleixner
2010-05-19 21:08 ` Thomas Gleixner
2010-05-20 1:34 ` Michael Ellerman
2010-05-20 7:37 ` Jan-Bernd Themann
2010-05-20 8:14 ` Thomas Gleixner
2010-05-20 9:05 ` Jan-Bernd Themann
2010-05-20 9:19 ` Thomas Gleixner
2010-05-20 14:26 ` Nivedita Singhvi
2010-05-20 14:53 ` Will Schmidt
2010-05-20 14:39 ` Darren Hart
2010-05-20 14:45 ` Thomas Gleixner
2010-05-20 21:44 ` Will Schmidt
2010-05-20 1:32 ` Michael Ellerman
2010-05-20 8:21 ` Thomas Gleixner
2010-05-21 9:18 ` [PATCH RT] ehea: make receive irq handler non-threaded (IRQF_NODELAY), " Milton Miller
2010-09-20 14:26 ` Jan-Bernd Themann
2010-05-20 1:28 ` Michael Ellerman
2010-05-21 9:02 ` Milton Miller
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