From: ebiederm@xmission.com (Eric W. Biederman)
To: Linus Torvalds <torvalds@osdl.org>
Cc: Andrew Morton <akpm@osdl.org>,
len.brown@intel.com, Thierry Vignaud <tvignaud@mandriva.com>,
Matthew Wilcox <matthew@wil.cx>, Ernst Herzberg <earny@net4u.de>,
Aaron Durbin <adurbin@google.com>,
Alex Romosan <romosan@sycorax.lbl.gov>,
openib-general@openib.org, Andi Kleen <ak@suse.de>,
linux-ide@vger.kernel.org, oprofile-list@lists.sourceforge.net,
Jens Axboe <jens.axboe@oracle.com>, Adrian Bunk <bunk@stusta.de>,
linux-pci@atrey.karlin.mff.cuni.cz,
Elimar Riesebieter <riesebie@lxtec.de>,
discuss@x86-64.org, linux-pm@osdl.org,
Komuro <komurojun-mbn@nifty.com>,
Jeff Chua <jeff.chua.linux@gmail.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
phil.el@wanadoo.fr, gregkh@suse.de, neilb@cse.unsw.edu.au,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-acpi@vger.kernel.org, mingo@redhat.com,
nfs@lists.sourceforge.net, cpufreq@lists.linux.o
Subject: Re: [discuss] Re: 2.6.19-rc4: known unfixed regressions (v3)
Date: Wed, 08 Nov 2006 10:38:27 -0700 [thread overview]
Message-ID: <m1d57x4z58.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0611080803280.3667@g5.osdl.org> (Linus Torvalds's message of "Wed, 8 Nov 2006 08:05:18 -0800 (PST)")
Linus Torvalds <torvalds@osdl.org> writes:
> On Wed, 8 Nov 2006, Matthew Wilcox wrote:
>>
>> On Wed, Nov 08, 2006 at 08:39:44AM +0100, Andi Kleen wrote:
>> > ACPI knows the number of busses.
>>
>> But what if the number of busses increases later, eg by hotplugging
>> a card with a PCI-PCI bridge on it? Or does it know the number of
>> busses which can be supported by this machine's MMCONFIG region?
>
> ACPI will give the maximum number.
>
> However, in this case, the correct thing to do (always _has_ been) is to
> not use ACPI for _anything_, but just read the base and the size of the
> MMCONFIG region from the hardware itself.
>
> Anyway, I do not consider this a regression. MMCONFIG has _never_ worked
> reliably. It has always been a case of "we can make it work on some
> machines by making it break on others".
The implementations I have seen, I believe have all been on bridges and
the maximum size is actually generated from the bus number below the bridge.
Eric
next prev parent reply other threads:[~2006-11-08 17:38 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-07 16:57 [discuss] Re: 2.6.19-rc4: known unfixed regressions (v3) Jeff Chua
2006-11-07 17:11 ` Aaron Durbin
2006-11-07 17:11 ` Matthew Wilcox
2006-11-07 17:49 ` Eric W. Biederman
2006-11-07 17:50 ` Aaron Durbin
2006-11-07 17:56 ` Matthew Wilcox
2006-11-08 15:14 ` Andi Kleen
2006-11-08 7:39 ` Andi Kleen
2006-11-08 12:22 ` Matthew Wilcox
2006-11-08 16:05 ` Linus Torvalds
2006-11-08 17:38 ` Eric W. Biederman [this message]
2006-11-08 18:52 ` Linus Torvalds
2006-11-08 19:10 ` Aaron Durbin
2006-11-08 19:25 ` Linus Torvalds
2006-11-08 19:24 ` Eric W. Biederman
2006-11-10 6:52 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2006-11-07 16:56 Jeff Chua
2006-11-06 22:40 Jeff Chua
2006-11-07 15:50 ` Aaron Durbin
[not found] <Pine.LNX.4.64.0610302019560.25218@g5.osdl.org>
2006-11-05 6:48 ` Adrian Bunk
2006-11-05 9:30 ` Jeff Chua
2006-11-06 17:47 ` [discuss] " Andi Kleen
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