linux-kernel - Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

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Date:	Sat, 30 Aug 2008 17:27:01 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Jordan Crouse" <jordan.crouse@....com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Jeff Garzik" <jeff@...zik.org>, "Tejun Heo" <htejun@...il.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"David Witbrodt" <dawitbro@...global.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Kernel Testers" <kernel-testers@...r.kernel.org>
Subject: Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

On Sat, Aug 30, 2008 at 4:39 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On Sat, Aug 30, 2008 at 4:28 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>>
>> On Sat, 30 Aug 2008, Yinghai Lu wrote:
>>>
>>> wait, THAT BAR is 64BIT capable, So kernel should assign 64bit range to it...
>>> it request_resource fails...
>>
>> I don't think we've ever done new allocations in 64 bits. Although looking
>> for it, I have to admit that I don't see what would limit us right now.
>> There used to be some paths that weren't 64-bit clean, but I think we
>> fixed all of those.
>
> would be some corner case...
>

pci_assign_unassigned_resources==>pci_bus_assign_resources==>pbus_assign_resources_sorted(struct

static void pbus_assign_resources_sorted(struct pci_bus *bus)
{
        struct pci_dev *dev;
        struct resource *res;
        struct resource_list head, *list, *tmp;
        int idx;

        head.next = NULL;
        list_for_each_entry(dev, &bus->devices, bus_list) {
                u16 class = dev->class >> 8;

                /* Don't touch classless devices or host bridges or ioapics.  */
                if (class == PCI_CLASS_NOT_DEFINED ||
                    class == PCI_CLASS_BRIDGE_HOST)
                        continue;


it skips the host bridge...

YH
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