From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: David Brownell <david-b@pacbell.net>
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
me@felipebalbi.com, linux-kernel@vger.kernel.org,
linux-input@vger.kernel.org, felipe.balbi@nokia.com,
dmitry.torokhov@gmail.com, sameo@openedhand.com,
tglx@linutronix.de
Subject: Re: lockdep and threaded IRQs (was: ...)
Date: Tue, 03 Mar 2009 10:27:26 +0100 [thread overview]
Message-ID: <1236072446.18955.44.camel@twins> (raw)
In-Reply-To: <200903021837.08635.david-b@pacbell.net>
On Mon, 2009-03-02 at 18:37 -0800, David Brownell wrote:
> No. But I did get a non-response that didn't include any
> explanation, and relied totally on unfounded assertions
> combined with the presumption that someday IRQF_DISABLED
> will be forced on in all drivers.
Enabling IRQs in hardirq context is BAD because:
- IRQ handler nesting leads to stack overflow
- It gives the false impression its OK for IRQ handlers to be slow,
it is _NOT_, as you still generate horrible preemption latency.
Therefore IRQF_DISABLED _will_ be forced on everybody some day soon, and
I'll provide an IRQF_ENABLED for use by broken hardware only (and make a
TAINT flag for that too).
next prev parent reply other threads:[~2009-03-03 9:27 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-27 19:28 [PATCH 1/2] input: misc: add twl4030-pwrbutton driver Felipe Balbi
2009-02-27 19:28 ` [PATCH 2/2] mfd: twl4030: add twl4030-pwrbutton as our child Felipe Balbi
2009-02-27 20:36 ` Andrew Morton
2009-02-27 21:58 ` David Brownell
2009-02-27 22:09 ` Felipe Balbi
2009-02-27 22:09 ` Felipe Balbi
2009-02-27 22:12 ` Andrew Morton
2009-02-27 23:20 ` David Brownell
2009-02-27 23:20 ` David Brownell
2009-02-27 23:42 ` Andrew Morton
2009-07-22 19:27 ` Trilok Soni
2009-07-22 22:25 ` David Brownell
2009-07-22 22:25 ` David Brownell
2009-02-27 20:33 ` [PATCH 1/2] input: misc: add twl4030-pwrbutton driver Andrew Morton
2009-02-27 20:37 ` Felipe Balbi
2009-02-27 21:50 ` lockdep and threaded IRQs (was: [PATCH 1/2] input: misc: add twl4030-pwrbutton driver) David Brownell
2009-02-27 21:50 ` David Brownell
2009-02-27 22:09 ` Andrew Morton
2009-02-27 23:18 ` lockdep and threaded IRQs (was: ...) David Brownell
2009-02-27 23:18 ` David Brownell
2009-02-27 23:32 ` Andrew Morton
2009-02-28 0:01 ` Andrew Morton
2009-02-28 0:01 ` Andrew Morton
2009-02-28 2:30 ` David Brownell
2009-02-28 2:39 ` Andrew Morton
2009-02-28 4:46 ` David Brownell
2009-02-28 5:12 ` Andrew Morton
2009-02-28 6:17 ` David Brownell
2009-02-28 11:13 ` Thomas Gleixner
2009-02-28 12:16 ` David Brownell
2009-02-28 16:42 ` Thomas Gleixner
2009-02-28 20:02 ` David Brownell
2009-02-28 20:02 ` David Brownell
2009-02-28 20:55 ` Thomas Gleixner
2009-02-28 21:13 ` Thomas Gleixner
2009-02-28 22:37 ` David Brownell
2009-02-28 22:05 ` David Brownell
2009-03-01 9:43 ` Thomas Gleixner
2009-03-01 22:54 ` David Brownell
2009-03-02 13:16 ` Peter Zijlstra
2009-03-02 21:04 ` David Brownell
2009-03-02 21:16 ` Peter Zijlstra
2009-03-02 21:29 ` Andrew Morton
2009-03-02 21:37 ` David Brownell
2009-03-02 21:41 ` Peter Zijlstra
2009-03-02 22:09 ` David Brownell
2009-03-02 22:19 ` Peter Zijlstra
2009-03-02 22:40 ` David Brownell
2009-03-02 22:51 ` Peter Zijlstra
2009-03-02 23:29 ` David Brownell
2009-03-03 7:45 ` Peter Zijlstra
2009-03-02 22:46 ` lockdep and threaded IRQs David Miller
2009-03-02 22:57 ` Andrew Morton
2009-03-02 23:07 ` Peter Zijlstra
2009-03-02 23:02 ` Peter Zijlstra
2009-03-02 23:35 ` lockdep and threaded IRQs (was: ...) Alan Cox
2009-03-01 22:11 ` David Brownell
2009-02-28 11:48 ` lockdep and threaded IRQs Stefan Richter
2009-02-28 20:19 ` David Brownell
2009-02-28 21:10 ` Stefan Richter
2009-03-02 13:16 ` lockdep and threaded IRQs (was: ...) Peter Zijlstra
2009-03-02 22:10 ` David Brownell
2009-03-02 22:25 ` Peter Zijlstra
2009-03-02 23:20 ` David Brownell
2009-03-02 23:26 ` Ingo Molnar
2009-03-02 23:42 ` David Brownell
2009-03-02 23:53 ` Ingo Molnar
2009-03-03 0:33 ` David Brownell
2009-03-03 0:33 ` David Brownell
2009-03-03 0:44 ` Ingo Molnar
2009-03-03 0:44 ` Ingo Molnar
2009-03-03 2:37 ` David Brownell
2009-03-03 2:37 ` David Brownell
2009-03-03 9:27 ` Peter Zijlstra [this message]
2009-03-03 9:45 ` Ingo Molnar
2009-03-03 9:47 ` Alan Cox
2009-03-03 10:03 ` Ingo Molnar
2009-03-03 10:30 ` Alan Cox
2009-03-03 10:39 ` Peter Zijlstra
2009-03-03 10:48 ` Ingo Molnar
2009-03-03 11:13 ` Alan Cox
2009-03-03 11:33 ` Ingo Molnar
2009-03-03 11:19 ` Ingo Molnar
2009-03-18 1:04 ` David Brownell
2009-03-18 2:00 ` David Brownell
2009-03-18 2:14 ` [patch/rfc 0/2] handle_threaded_irq() David Brownell
2009-03-18 2:19 ` [patch/rfc 1/2] GENIRQ: add handle_threaded_irq() flow handler David Brownell
2009-03-18 12:00 ` Felipe Balbi
2009-03-18 18:31 ` David Brownell
2009-03-18 18:32 ` Felipe Balbi
2009-03-18 2:22 ` [patch/rfc 2/2] twl4030: use new " David Brownell
2009-03-03 11:53 ` lockdep and threaded IRQs (was: ...) Thomas Gleixner
2009-03-05 2:49 ` David Brownell
2009-03-05 2:49 ` David Brownell
2009-03-06 14:40 ` Thomas Gleixner
2009-03-18 3:06 ` David Brownell
2009-03-02 23:48 ` David Brownell
2009-03-02 23:48 ` David Brownell
2009-03-02 23:58 ` Ingo Molnar
2009-03-02 23:58 ` Ingo Molnar
2009-03-02 15:13 ` [PATCH] genirq: assert that irq handlers are indeed run in hardirq context Peter Zijlstra
2009-03-02 19:48 ` David Brownell
2009-03-02 22:01 ` [tip:irq/genirq] genirq: assert that irq handlers are indeed running " Peter Zijlstra
2009-03-02 23:15 ` Peter Zijlstra
2009-04-10 7:11 ` Eric Miao
2009-04-10 9:57 ` Thomas Gleixner
2009-02-28 11:20 ` lockdep and threaded IRQs Stefan Richter
2009-02-28 20:10 ` David Brownell
2009-02-28 5:51 ` [PATCH 1/2] input: misc: add twl4030-pwrbutton driver Trilok Soni
2009-02-28 12:05 ` [PATCH] mfd: twl4030: add twl4030-pwrbutton as our child Felipe Balbi
2009-02-28 22:23 ` [PATCH 1/2] input: misc: add twl4030-pwrbutton driver Dmitry Torokhov
2009-03-01 0:30 ` Felipe Balbi
2009-03-01 0:58 ` Dmitry Torokhov
2009-03-01 14:40 ` Felipe Balbi
2009-03-04 9:00 ` Dmitry Torokhov
2009-03-04 10:12 ` Felipe Balbi
2009-03-05 1:38 ` David Brownell
2009-03-05 23:54 ` David Brownell
2009-03-06 9:43 ` Dmitry Torokhov
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