From: Ingo Molnar <mingo@elte.hu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org,
dwalker@mvista.com
Subject: Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers
Date: Sun, 19 Nov 2006 21:23:48 +0100 [thread overview]
Message-ID: <20061119202348.GA27649@elte.hu> (raw)
In-Reply-To: <1163967590.5826.104.camel@localhost.localdomain>
* Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> > dont worry, it's -rt only stuff.
>
> Still, I'm curious :-) Besides, there have been people talking about
> having -rt work on ppc64 so ...
ok :)
> What do you need an ack() for on fasteoi ? On all fasteoi controllers
> I have, ack is implicit by obtaining the vector number and all there
> is is an eoi...
it's a compatibility hack only. Threaded handlers are a different type
of flow, but often the fasteoi handler is not changed to the threaded
handler so i changed it to be a threaded handler too.
threaded handlers need a mask() + an ack(), because that's the correct
model to map them to kernel threads - threaded handlers can be delayed
for a long time if something higher-prio is preempting them.
Ingo
WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@elte.hu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>,
linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org,
dwalker@mvista.com
Subject: Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers
Date: Sun, 19 Nov 2006 21:23:48 +0100 [thread overview]
Message-ID: <20061119202348.GA27649@elte.hu> (raw)
In-Reply-To: <1163967590.5826.104.camel@localhost.localdomain>
* Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> > dont worry, it's -rt only stuff.
>
> Still, I'm curious :-) Besides, there have been people talking about
> having -rt work on ppc64 so ...
ok :)
> What do you need an ack() for on fasteoi ? On all fasteoi controllers
> I have, ack is implicit by obtaining the vector number and all there
> is is an eoi...
it's a compatibility hack only. Threaded handlers are a different type
of flow, but often the fasteoi handler is not changed to the threaded
handler so i changed it to be a threaded handler too.
threaded handlers need a mask() + an ack(), because that's the correct
model to map them to kernel threads - threaded handlers can be delayed
for a long time if something higher-prio is preempting them.
Ingo
next prev parent reply other threads:[~2006-11-19 20:24 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-19 19:43 [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers Sergei Shtylyov
2006-11-19 19:43 ` Sergei Shtylyov
2006-11-19 20:00 ` Benjamin Herrenschmidt
2006-11-19 20:00 ` Benjamin Herrenschmidt
2006-11-19 20:04 ` Benjamin Herrenschmidt
2006-11-19 20:04 ` Benjamin Herrenschmidt
2006-11-19 20:11 ` Sergei Shtylyov
2006-11-19 20:11 ` Sergei Shtylyov
2006-11-19 20:06 ` Ingo Molnar
2006-11-19 20:06 ` Ingo Molnar
2006-11-19 20:19 ` Benjamin Herrenschmidt
2006-11-19 20:19 ` Benjamin Herrenschmidt
2006-11-19 20:23 ` Ingo Molnar [this message]
2006-11-19 20:23 ` Ingo Molnar
2006-11-19 20:31 ` Sergei Shtylyov
2006-11-19 20:31 ` Sergei Shtylyov
2006-11-19 20:36 ` Benjamin Herrenschmidt
2006-11-19 20:36 ` Benjamin Herrenschmidt
2006-11-19 20:42 ` Sergei Shtylyov
2006-11-19 20:42 ` Sergei Shtylyov
2006-11-19 20:45 ` Benjamin Herrenschmidt
2006-11-19 20:45 ` Benjamin Herrenschmidt
2006-11-19 20:49 ` Benjamin Herrenschmidt
2006-11-19 20:49 ` Benjamin Herrenschmidt
2006-11-20 1:16 ` Benjamin Herrenschmidt
2006-11-20 1:16 ` Benjamin Herrenschmidt
2006-11-20 10:01 ` Ingo Molnar
2006-11-20 10:01 ` Ingo Molnar
2006-11-20 15:29 ` Sergei Shtylyov
2006-11-20 15:29 ` Sergei Shtylyov
2006-11-20 16:56 ` Ingo Molnar
2006-11-20 16:56 ` Ingo Molnar
2006-11-20 17:03 ` Sergei Shtylyov
2006-11-20 17:03 ` Sergei Shtylyov
2006-11-20 17:26 ` Ingo Molnar
2006-11-20 17:26 ` Ingo Molnar
2006-11-20 17:55 ` Ingo Molnar
2006-11-20 17:55 ` Ingo Molnar
2006-11-20 18:20 ` Daniel Walker
2006-11-20 18:20 ` Daniel Walker
2006-11-20 18:29 ` Ingo Molnar
2006-11-20 18:29 ` Ingo Molnar
2006-11-20 18:30 ` Sergei Shtylyov
2006-11-20 18:30 ` Sergei Shtylyov
2006-11-20 19:10 ` Ingo Molnar
2006-11-20 19:10 ` Ingo Molnar
2006-11-20 19:11 ` Ingo Molnar
2006-11-20 19:11 ` Ingo Molnar
2006-11-20 19:18 ` Sergei Shtylyov
2006-11-20 19:18 ` Sergei Shtylyov
2006-11-20 19:24 ` Sergei Shtylyov
2006-11-20 19:24 ` Sergei Shtylyov
2006-11-20 19:23 ` Ingo Molnar
2006-11-20 20:11 ` Benjamin Herrenschmidt
2006-11-20 20:11 ` Benjamin Herrenschmidt
2006-11-20 20:09 ` Benjamin Herrenschmidt
2006-11-20 20:09 ` Benjamin Herrenschmidt
2006-11-20 16:25 ` Daniel Walker
2006-11-20 16:25 ` Daniel Walker
2006-11-20 16:42 ` Ingo Molnar
2006-11-20 17:01 ` Daniel Walker
2006-11-20 20:07 ` Benjamin Herrenschmidt
2006-11-20 20:07 ` Benjamin Herrenschmidt
2006-11-19 20:26 ` Sergei Shtylyov
2006-11-19 20:26 ` Sergei Shtylyov
2006-11-19 20:32 ` Benjamin Herrenschmidt
2006-11-19 20:32 ` Benjamin Herrenschmidt
2006-11-19 20:40 ` Sergei Shtylyov
2006-11-19 20:40 ` Sergei Shtylyov
2006-11-19 20:41 ` Benjamin Herrenschmidt
2006-11-19 20:41 ` Benjamin Herrenschmidt
2006-11-19 20:52 ` Sergei Shtylyov
2006-11-19 20:52 ` Sergei Shtylyov
2006-11-19 21:08 ` Benjamin Herrenschmidt
2006-11-19 21:08 ` Benjamin Herrenschmidt
2006-11-20 15:46 ` Sergei Shtylyov
2006-11-20 15:46 ` Sergei Shtylyov
2006-11-19 20:44 ` Sergei Shtylyov
2006-11-19 20:48 ` Benjamin Herrenschmidt
2007-05-17 13:20 ` [PATCH 2.6.21-rt2] PowerPC: revert fix for threaded fasteoi " Sergei Shtylyov
2007-05-17 13:20 ` Sergei Shtylyov
2007-07-12 16:47 ` Sergei Shtylyov
2007-07-12 16:52 ` Thomas Gleixner
2007-07-12 16:52 ` Thomas Gleixner
2007-07-13 17:19 ` Sergei Shtylyov
2007-07-13 17:19 ` Sergei Shtylyov
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