Re: [PATCH -v11 04/30] PCI: Add busn_res into struct pci_bus.

[Bjorn Helgaas <bhelgaas@xxxxxxxxxx>]

On Sun, Mar 18, 2012 at 11:42 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> Will use it to track bus number resource tree.
>
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> ---
>  include/linux/pci.h |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index d93d3ae..7c03852 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -419,6 +419,7 @@ struct pci_bus {
>        struct list_head slots;         /* list of slots on this bus */
>        struct resource *resource[PCI_BRIDGE_RESOURCE_NUM];
>        struct list_head resources;     /* address space routed to this bus */
> +       struct resource busn_res;       /* track registered bus num range */
>
>        struct pci_ops  *ops;           /* configuration access functions */
>        void            *sysdata;       /* hook for sys-specific extension */

struct pci_bus already includes "secondary" and "subordinate".    This
new "busn_res" looks like it will contain the same information.  Why
do we need both?
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