From: Linus Torvalds <torvalds@linux-foundation•org>
To: Mark Brown <broonie@opensource•wolfsonmicro.com>
Cc: Stephen Rothwell <sfr@canb•auug.org.au>,
linux-next@vger•kernel.org, LKML <linux-kernel@vger•kernel.org>,
Liam Girdwood <lrg@slimlogic•co.uk>
Subject: Re: linux-next: origin tree build failure
Date: Tue, 14 Oct 2008 17:34:57 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.00.0810141721450.3288@nehalem.linux-foundation.org> (raw)
In-Reply-To: <20081015000541.GA22570@opensource.wolfsonmicro.com>
On Wed, 15 Oct 2008, Mark Brown wrote:
>
> That would be people on the ARM list. Unless I misremember I first
> heard about using NO_IRQ from the ARM list in connection with another
> (much less ARM-specific) driver only within the past six months.
ARM should just do
#define NO_IRQ (0)
and be done with it. It's what powerpc did long ago. That allows old
broken drivers to work, and doesn't require new drivers to introduce more
NO_IRQ insanity.
If there is a "hardware irq 0", either it can be special (eg some
system-only irq not used by any drivers) or the irq numbers can/must be
remapped.
ARM already converted to the generic irq layer, and there are actually
parts of that that know that irq 0 has special meaning. Like the
autoprobing and spurious irq handling. Of course, ARM may not care, and
the generic code is generally trying to avoid any assumptions, but it's
still true that all generic _drivers_ do the whole "if (irq)" thing.
Yeah, yeah, we've let NO_IRQ poison some subsystems (like IDE and
apparently parts of i2c), but that was a mistake.
Linus
next prev parent reply other threads:[~2008-10-15 0:35 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-14 22:59 linux-next: origin tree build failure Stephen Rothwell
2008-10-14 23:43 ` Linus Torvalds
2008-10-14 23:52 ` David Miller
2008-10-15 0:05 ` Mark Brown
2008-10-15 0:34 ` Linus Torvalds [this message]
2008-10-14 23:51 ` Linus Torvalds
2008-10-15 9:02 ` Alan Cox
2008-10-15 9:33 ` Ingo Molnar
2008-10-15 11:01 ` Mark Brown
-- strict thread matches above, loose matches on Subject: below --
2010-01-12 1:14 Stephen Rothwell
2010-01-12 1:26 ` Linus Torvalds
2010-01-12 2:32 ` Stephen Rothwell
2010-01-12 2:39 ` Stephen Rothwell
2010-01-13 0:14 ` Phillip Lougher
2010-01-13 2:55 ` Stephen Rothwell
2010-01-11 23:58 Stephen Rothwell
2010-01-12 0:29 ` Joakim Tjernlund
2010-01-12 12:38 ` Joakim Tjernlund
2009-12-24 0:54 Stephen Rothwell
2009-12-15 5:41 Stephen Rothwell
2009-12-15 8:07 ` Ingo Molnar
2009-12-15 13:01 ` Peter Ujfalusi
2009-12-15 14:53 ` Mark Brown
2009-12-15 17:27 ` Tony Lindgren
2009-12-15 22:45 ` Stephen Rothwell
2009-12-15 23:02 ` Linus Torvalds
2009-12-15 23:37 ` Stephen Rothwell
2009-12-16 9:30 ` Samuel Ortiz
2009-12-09 23:57 Stephen Rothwell
2009-11-30 23:10 Stephen Rothwell
2009-11-12 0:23 Stephen Rothwell
2009-10-09 7:50 Stephen Rothwell
2009-07-09 0:28 Stephen Rothwell
2009-06-25 1:13 Stephen Rothwell
2009-06-25 3:24 ` Baruch Siach
2009-06-25 4:12 ` Paul Mundt
2009-06-23 6:22 Stephen Rothwell
2009-06-23 10:13 ` Mark Brown
2009-06-19 6:30 Stephen Rothwell
2009-06-12 0:46 Stephen Rothwell
2009-06-12 0:24 Stephen Rothwell
2009-06-12 0:53 ` Paul Mackerras
2009-06-12 1:00 ` Benjamin Herrenschmidt
2009-06-12 9:20 ` Ingo Molnar
2009-06-12 9:33 ` Benjamin Herrenschmidt
2009-06-12 9:43 ` Peter Zijlstra
2009-06-12 9:55 ` Ingo Molnar
2009-06-12 9:57 ` Benjamin Herrenschmidt
2009-06-12 12:53 ` Ingo Molnar
2009-06-12 13:10 ` Benjamin Herrenschmidt
2009-06-12 13:29 ` Benjamin Herrenschmidt
2009-06-12 13:49 ` Ingo Molnar
2009-06-12 14:06 ` Benjamin Herrenschmidt
2009-06-12 14:11 ` Ingo Molnar
2009-06-12 14:23 ` Benjamin Herrenschmidt
2009-06-13 5:06 ` Stephen Rothwell
2009-06-12 13:44 ` Ingo Molnar
2009-06-12 13:56 ` Benjamin Herrenschmidt
2009-06-12 14:07 ` Ingo Molnar
2009-06-12 14:19 ` Benjamin Herrenschmidt
2009-06-13 4:54 ` Stephen Rothwell
2009-04-14 7:34 Stephen Rothwell
2009-04-14 7:58 ` Jesper Nilsson
2009-04-14 4:43 Stephen Rothwell
2009-04-14 8:57 ` David Miller
2009-04-14 9:20 ` Heiko Carstens
2009-04-14 9:08 ` David Miller
2009-04-14 10:26 ` Stephen Rothwell
2009-04-08 3:28 Stephen Rothwell
2009-04-08 0:10 Stephen Rothwell
2009-03-30 0:55 Stephen Rothwell
[not found] <20090112104837.69feedec.sfr@canb.auug.org.au>
2009-01-12 0:10 ` Benjamin Herrenschmidt
2009-01-12 0:10 ` Benjamin Herrenschmidt
2009-01-12 0:10 ` Benjamin Herrenschmidt
[not found] ` <1231719015.22571.4.camel@pasglop>
2009-01-12 9:05 ` Ingo Molnar
2009-01-12 9:24 ` Stephen Rothwell
2009-01-12 9:32 ` Ingo Molnar
2009-01-13 16:31 ` Stephen Rothwell
2009-01-12 9:49 ` Michael Ellerman
2009-01-12 10:44 ` Ingo Molnar
2009-01-12 10:44 ` Ingo Molnar
2009-01-12 10:44 ` Ingo Molnar
2009-01-11 23:48 Stephen Rothwell
2009-01-11 23:48 Stephen Rothwell
2009-01-11 23:48 Stephen Rothwell
2008-12-29 0:43 Stephen Rothwell
2008-12-29 3:36 ` Roland Dreier
2008-12-29 3:44 ` Roland Dreier
2008-12-29 9:58 ` Aleksey Senin
2008-12-29 0:00 Stephen Rothwell
2008-12-28 23:51 Stephen Rothwell
2008-12-28 23:38 Stephen Rothwell
2008-12-29 0:31 ` Linus Torvalds
2008-10-16 0:35 Stephen Rothwell
2008-10-16 4:57 ` David Miller
2008-10-16 0:31 Stephen Rothwell
2008-10-16 12:58 ` Ralf Baechle
2008-08-26 0:37 Stephen Rothwell
2008-08-18 0:01 Stephen Rothwell
2008-08-18 12:55 ` David Howells
2008-08-18 14:03 ` James Morris
2008-07-25 0:30 Stephen Rothwell
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