On Sat, Aug 30, 2008 at 4:39 PM, Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
> On Sat, Aug 30, 2008 at 4:28 PM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> 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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