why early_quirks only scan first 32 pci bus

[Crane Cai <crane.cai@xxxxxxx>]

Hi Jesse,

Sorry to disturb you. This is a question needs you help:

In file: $(KERNEL_SRC)/arch/x86/kernel/early-quirks.c
function early_quirks:
---
void __init early_quirks(void)
{
        int num, slot, func;

        if (!early_pci_allowed())
                return;

        /* Poor man's PCI discovery */
=>      for (num = 0; num < 32; num++)
                for (slot = 0; slot < 32; slot++)
                        for (func = 0; func < 8; func++) {
                                /* Only probe function 0 on single fn
devices */
                                if (check_dev_quirk(num, slot, func))
                                        break;
                        }
}
---

Why we only scan first 32 pci bus? We know in spec there are 256 pci
bus.

Thanks,
- Crane

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