From: Greg Kroah-Hartmann <greg@kroah.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Kay Sievers <kay@vrfy.org>, Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer
Date: Thu, 3 May 2012 13:18:44 -0700 [thread overview]
Message-ID: <20120503201844.GA21584@kroah.com> (raw)
In-Reply-To: <1336075862.6509.10.camel@twins>
On Thu, May 03, 2012 at 10:11:02PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-05-03 at 13:09 -0700, Linus Torvalds wrote:
> > On Thu, May 3, 2012 at 1:02 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > >
> > > Thing is, with bonkers stuff like usb-console and kms/drm that's a _lot_
> > > of code running under the logbuf/console locks.
> >
> > The top-level console lock shouldn't be a problem - we use trylock and
> > delay if it is held.
> >
> > It's the lower-level driver-specific locks that screw us up. And quite
> > frankly, I am *not* willing to say that that is a printk() problem.
> > That is purely a "USB serial console is damn well broken" issue, and
> > should not be considered a limitation of printk.
>
> I'm happy to call all that broken ;-)
USB serial console was a drunken bet gone wrong. I'm amazed that it
even works at times, and it should never be considered critical enough
to affect any core kernel code.
greg k-h
next prev parent reply other threads:[~2012-05-03 20:18 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-03 0:29 [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer Kay Sievers
2012-05-03 19:48 ` Peter Zijlstra
2012-05-03 19:54 ` Kay Sievers
2012-05-03 19:55 ` Peter Zijlstra
2012-05-03 19:56 ` Linus Torvalds
2012-05-03 20:02 ` Peter Zijlstra
2012-05-03 20:09 ` Linus Torvalds
2012-05-03 20:11 ` Peter Zijlstra
2012-05-03 20:18 ` Greg Kroah-Hartmann [this message]
2012-05-08 8:48 ` Sasha Levin
2012-05-08 11:14 ` Kay Sievers
2012-05-08 13:33 ` Sasha Levin
2012-05-08 14:29 ` Kay Sievers
2012-05-08 15:33 ` Kay Sievers
2012-05-08 15:57 ` Sasha Levin
2012-05-08 16:27 ` Kay Sievers
2012-05-08 22:57 ` Greg Kroah-Hartmann
2012-05-09 3:52 ` Linus Torvalds
2012-05-09 4:06 ` Joe Perches
2012-05-09 4:11 ` Sasha Levin
2012-05-09 4:27 ` Linus Torvalds
2012-05-09 4:36 ` Linus Torvalds
2012-05-09 7:07 ` Ingo Molnar
2012-05-09 13:21 ` Kay Sievers
2012-05-09 13:29 ` Kay Sievers
2012-05-10 0:54 ` Kay Sievers
2012-05-10 1:18 ` Linus Torvalds
2012-05-10 2:32 ` Kay Sievers
2012-05-10 2:46 ` Joe Perches
2012-05-10 16:39 ` Kay Sievers
2012-05-10 16:47 ` Linus Torvalds
2012-05-10 18:49 ` Tony Luck
2012-05-10 19:09 ` Kay Sievers
2012-05-10 20:14 ` Ted Ts'o
2012-05-10 20:37 ` Joe Perches
2012-05-10 20:39 ` Kay Sievers
2012-05-10 20:46 ` Joe Perches
2012-05-10 20:52 ` Linus Torvalds
2012-05-10 21:11 ` Joe Perches
2012-05-10 21:15 ` Kay Sievers
2012-05-10 21:58 ` Linus Torvalds
2012-05-11 0:13 ` Joe Perches
2012-05-11 0:38 ` Kay Sievers
2012-05-11 1:23 ` Kay Sievers
2012-05-14 18:46 ` Kay Sievers
2012-05-10 21:01 ` Kay Sievers
2012-05-10 20:38 ` Kay Sievers
2012-05-09 9:38 ` Kay Sievers
2012-05-09 13:50 ` Joe Perches
2012-05-09 14:37 ` Kay Sievers
2012-05-09 23:02 ` Yinghai Lu
2012-05-09 23:06 ` Greg Kroah-Hartmann
2012-05-10 2:30 ` Kay Sievers
2012-05-11 10:35 ` Sasha Levin
2012-05-11 15:19 ` Greg KH
2012-05-11 15:22 ` Sasha Levin
2012-05-11 15:35 ` Linus Torvalds
2012-05-11 15:40 ` Kay Sievers
2012-05-11 15:47 ` Linus Torvalds
2012-05-11 19:51 ` Mark Lord
2012-05-11 20:02 ` Linus Torvalds
2012-05-12 18:04 ` Mark Lord
2012-05-12 7:43 ` Sasha Levin
2012-05-12 18:35 ` Linus Torvalds
2012-05-13 11:08 ` Kay Sievers
2012-05-13 13:22 ` Mark Lord
2012-05-13 18:01 ` Linus Torvalds
2012-05-13 22:19 ` Mark Lord
2012-05-14 16:40 ` valdis.kletnieks
2012-05-17 3:44 ` H. Peter Anvin
2012-05-13 21:48 ` Kay Sievers
2012-05-13 21:30 ` Kay Sievers
2012-05-26 11:11 ` Anton Vorontsov
2012-05-27 14:23 ` Kay Sievers
2012-05-29 16:07 ` Kay Sievers
2012-05-29 16:14 ` Joe Perches
2012-05-29 16:34 ` Kay Sievers
2012-05-29 16:51 ` Joe Perches
2012-05-29 17:11 ` Luck, Tony
2012-05-29 17:22 ` Kay Sievers
2012-05-30 11:29 ` Kay Sievers
2012-06-06 6:33 ` Greg Kroah-Hartmann
2012-06-15 0:04 ` Greg KH
2012-06-15 1:31 ` Anton Vorontsov
2012-06-15 12:07 ` Kay Sievers
2012-06-15 12:23 ` Ingo Molnar
2012-06-15 21:53 ` Greg KH
2012-06-15 12:23 ` Anton Vorontsov
2012-06-15 20:54 ` Tony Luck
2012-11-28 13:33 ` Michael Kerrisk
2012-11-28 16:22 ` Kay Sievers
2012-11-28 16:37 ` Linus Torvalds
2012-11-28 16:49 ` Kay Sievers
2012-11-28 17:51 ` Kay Sievers
2012-11-29 13:18 ` Michael Kerrisk (man-pages)
2012-11-29 13:28 ` Kay Sievers
2012-11-29 13:37 ` Michael Kerrisk (man-pages)
2012-11-29 14:08 ` Kay Sievers
2012-11-29 14:18 ` Michael Kerrisk (man-pages)
2012-11-29 14:31 ` Kay Sievers
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