linux-kernel - Re: [PATCH 08/13] PCI: Add pci_bus_extend/shrink

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Message-ID: <CAE9FiQX1=U=ysmvRY4Kwx8MAR1KWxn3JaD32xjdCSnbWXT7V2A@mail.gmail.com>
Date:	Mon, 30 Jan 2012 10:42:01 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 08/13] PCI: Add pci_bus_extend/shrink_top()

On Mon, Jan 30, 2012 at 7:50 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Fri, Jan 27, 2012 at 6:49 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> extend or shrink bus and parent buses top (subordinate)
>>
>> extended range is verified safe range, and stop at recorded parent_res.
...
> This makes me nervous for the same reason as
> pci_bus_update_busn_res_end() -- we're changing res->end for resources
> already in a tree.  How do we know the tree remains consistent?
>

Yes, we already try to allocate near the top and later pad the top. So
it is safe to just adjust top.

Yinghai
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