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From: Robert Hancock <hancockrwd@gmail.com>
To: Roland Dreier <rdreier@cisco.com>
Cc: Ingo Molnar <mingo@elte.hu>, "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Robert P. J. Day" <rpjday@crashcourse.ca>,
	Hitoshi Mitake <h.mitake@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: arch/x86/Kconfig selects invalid HAVE_READQ, HAVE_WRITEQ vars
Date: Sun, 19 Apr 2009 20:08:52 -0600	[thread overview]
Message-ID: <49EBD934.4070909@gmail.com> (raw)
In-Reply-To: <adaskk4ywf9.fsf@cisco.com>

Roland Dreier wrote:
>  > Also, atomicity might not be possible to guarantee on the bus level: 
>  > say the device sits on a 32-bit PCI bus. (No matter what instruction 
>  > the CPU gets, a readq/writeq there has to be done as two 32-bit bus 
>  > accesses.)
> 
> Well, the conventional PCI devices I know of with 64-bit registers were
> PCI-X cards, keyed so they would only fit into a 64-bit slot.  And of
> course there is no such thing as 32-bit PCI Express.

It's quite possible to use most 64-bit PCI-X cards in a 32-bit slot, 
with the 64-bit part of the card not plugged into anything. It's 
supposed to work (as long as the card can handle the voltage the slot uses).

  reply	other threads:[~2009-04-20  2:09 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-19 19:45 arch/x86/Kconfig selects invalid HAVE_READQ, HAVE_WRITEQ vars Robert P. J. Day
2009-04-19 21:12 ` Roland Dreier
2009-04-19 21:46   ` Ingo Molnar
2009-04-19 22:02     ` H. Peter Anvin
2009-04-19 22:35       ` Ingo Molnar
2009-04-20  0:56         ` Roland Dreier
2009-04-20  2:08           ` Robert Hancock [this message]
2009-04-20  0:53     ` Roland Dreier
2009-04-20  1:20       ` H. Peter Anvin
2009-04-20 10:53         ` Ingo Molnar
2009-04-20 14:47           ` Hitoshi Mitake
2009-04-20 16:03             ` Ingo Molnar
2009-04-21  8:33               ` Hitoshi Mitake
2009-04-21  8:45                 ` Ingo Molnar
2009-04-21  8:57                   ` Hitoshi Mitake
2009-04-21 15:44                 ` H. Peter Anvin
2009-04-21 17:07                   ` Roland Dreier
2009-04-21 17:19                     ` H. Peter Anvin
2009-04-21 17:23                       ` Roland Dreier
2009-04-21 19:09                         ` H. Peter Anvin
2009-04-21 21:11                           ` Roland Dreier
2009-04-21 21:16                             ` H. Peter Anvin
2009-04-22  0:31                               ` David Miller
2009-04-28 19:05                                 ` [PATCH] x86: Remove readq()/writeq() on 32-bit Roland Dreier
2009-04-29  5:12                                   ` David Miller
2009-04-29 11:56                                     ` Ingo Molnar
2009-04-29 12:10                                       ` Jeff Garzik
2009-04-29 17:25                                         ` Roland Dreier
2009-04-29 19:59                                           ` Jeff Garzik
2009-05-13  5:32                                             ` Hitoshi Mitake
2009-05-13 20:19                                               ` H. Peter Anvin
2009-05-13 22:39                                                 ` Jeff Garzik
2009-05-13 23:39                                                   ` H. Peter Anvin
2009-05-14  0:49                                                     ` Jeff Garzik
2009-05-14  7:19                                                       ` Hitoshi Mitake
2009-05-15 23:44                                                         ` Jeff Garzik
2009-05-17  7:12                                                           ` Hitoshi Mitake
2009-05-17  8:06                                                             ` Jeff Garzik
2009-05-21 11:35                                                               ` Hitoshi Mitake
2009-05-21 11:49                                                                 ` Hitoshi Mitake
2009-05-13 20:42                                               ` Jeff Garzik
2009-05-13 21:05                                                 ` H. Peter Anvin
2009-05-13 21:30                                                   ` Jeff Garzik
2009-05-13 21:31                                                     ` Jeff Garzik
2009-05-13 21:54                                                     ` H. Peter Anvin
2009-05-13 22:06                                                 ` Roland Dreier
2009-05-13 22:29                                                   ` Jeff Garzik
2009-04-29 17:21                                       ` Roland Dreier
2009-04-22  0:27                           ` arch/x86/Kconfig selects invalid HAVE_READQ, HAVE_WRITEQ vars David Miller
2009-04-22  0:25                     ` David Miller

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