From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Olof Johansson <olof@austin.ibm.com>,
Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
jamie@shareable.org, Rusty Russell <rusty@rustcorp.com.au>,
David Howells <dhowells@redhat.com>
Subject: Re: [PATCH/RFC] Futex mmap_sem deadlock
Date: Wed, 23 Feb 2005 08:16:09 +1100 [thread overview]
Message-ID: <1109106969.5412.138.camel@gaston> (raw)
In-Reply-To: <Pine.LNX.4.58.0502221123540.2378@ppc970.osdl.org>
On Tue, 2005-02-22 at 11:36 -0800, Linus Torvalds wrote:
> DavidH - what's the word on nested read-semaphores like this? Are they
> supposed to work (like nested read-spinlocks), or do we need to do the
> things Olof does?
Isn't Olof scheme racy ? Can't the stuff get swapped out between the
first get_user() and the "real" one ?
Ben.
next prev parent reply other threads:[~2005-02-22 21:17 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-22 19:06 [PATCH/RFC] Futex mmap_sem deadlock Olof Johansson
2005-02-22 19:36 ` Linus Torvalds
2005-02-22 21:16 ` Benjamin Herrenschmidt [this message]
2005-02-22 21:19 ` Benjamin Herrenschmidt
2005-02-22 21:31 ` Linus Torvalds
2005-02-22 21:42 ` Benjamin Herrenschmidt
2005-02-22 22:10 ` Linus Torvalds
2005-02-22 22:24 ` Benjamin Herrenschmidt
2005-02-22 23:08 ` Greg KH
2005-02-23 11:24 ` David Howells
2005-02-22 19:55 ` Andrew Morton
2005-02-22 21:07 ` Jamie Lokier
2005-02-22 21:19 ` Olof Johansson
2005-02-22 22:09 ` Jamie Lokier
2005-02-22 21:19 ` Chris Friesen
2005-02-22 21:27 ` Jamie Lokier
2005-02-22 21:30 ` Linus Torvalds
2005-02-22 22:34 ` Jamie Lokier
2005-02-22 22:42 ` Olof Johansson
2005-02-22 23:20 ` Andrew Morton
2005-02-22 23:23 ` Olof Johansson
2005-02-23 11:39 ` David Howells
2005-02-23 16:22 ` Olof Johansson
2005-02-23 18:44 ` David Howells
2005-02-23 14:49 ` Joe Korty
2005-02-23 15:54 ` Linus Torvalds
2005-02-23 17:10 ` Olof Johansson
2005-02-23 17:37 ` Arjan van de Ven
2005-02-23 18:22 ` Jamie Lokier
2005-02-23 18:34 ` Linus Torvalds
2005-02-23 18:49 ` Jamie Lokier
2005-02-23 19:12 ` Olof Johansson
2005-02-23 22:00 ` Linus Torvalds
2005-02-24 0:00 ` Jamie Lokier
2005-02-23 18:37 ` Olof Johansson
2005-02-22 21:40 ` Andrew Morton
2005-02-22 21:59 ` Linus Torvalds
2005-02-23 11:42 ` David Howells
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