On Tue, Jun 09, 2015 at 05:58:15PM +0100, Jiang Liu wrote:

On 2015/6/10 0:12, Lorenzo Pieralisi wrote:

[...]

quoted

quoted

+struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
+				     struct acpi_pci_root_ops *ops,
+				     struct acpi_pci_root_info *info,
+				     void *sysdata, int segment, int node)

I do not think you need to pass segment and node, they clutter the
function signature when you can retrieve them from root, I would
make them local variables and use root->segment and acpi_get_node
in the function body to retrieve them.

On x86, node and segment may be overridden under certain conditions.
For example, segment will always be 0 if 'pci_ignore_seg' is set.

Ok, so the question would be then why do you not override the value
in root->segment then (actually, is it *correct* to leave the segment
value in root-> unchanged even if it is overriden) ?

Anyway, node is just used for a printk, why do not you add segment and
node to acpi_pci_root_info ? Just cosmetic stuff, trying to help you
simplify the code, it is not easy to parse.

Thanks,
Lorenzo