linux-kernel - Re: [PATCH v2 14/29] sparc/PCI: convert to pci_create_root

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Message-Id: <20111014.004654.210648346142583443.davem@davemloft.net>
Date:	Fri, 14 Oct 2011 00:46:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	bhelgaas@...gle.com
Cc:	linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/29] sparc/PCI: convert to pci_create_root_bus()
 for correct root bus resources

From: Bjorn Helgaas <bhelgaas@...gle.com>
Date: Thu, 13 Oct 2011 22:28:18 -0600

> Convert from pci_create_bus() to pci_create_root_bus().  This way the root
> bus resources are correct immediately.  This patch doesn't fix anything
> because sparc fixed them before scanning the bus, but it makes it more
> consistent with other architectures.
> 
> I didn't work out where pcibios_fixup_bus() is called.  I don't see a
> use of pci_scan_bus(), pci_scan_bus_parented(), or pci_scan_child_bus().
> 
> CC: David S. Miller <davem@...emloft.net>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

The pcibios_fixup_bus() case here (sparc64) is an artifact from when
we actually probed the PCI config space for device probing on sparc64,
and pci_bus_probe() would invoke it.

Unfortunately we can't delete this function now even though it's empty
with your changes, because drivers/pci/probe.o is unconditionally
linked into the kernel when CONFIG_PCI even when an architecture
(such as sparc64) doesn't use the majority of the code in it.

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