linux-kernel - Re: [PATCH -v11 04/30] PCI: Add busn_res into struct pci

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Date:	Mon, 30 Apr 2012 17:25:52 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>,
	David Miller <davem@...emloft.net>, x86 <x86@...nel.org>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH -v11 04/30] PCI: Add busn_res into struct pci_bus.

On Sun, Mar 18, 2012 at 11:42 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> Will use it to track bus number resource tree.
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  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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