linux-kernel - Re: [PATCH v3, part1 04/10] PCI: mark pci_scan_bus_parented() as _

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Message-ID: <51B0B99C.4020009@gmail.com>
Date:	Fri, 07 Jun 2013 00:32:28 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Yinghai Lu <yinghai@...nel.org>, Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH v3, part1 04/10] PCI: mark pci_scan_bus_parented() as
 __deprecated

On Thu 06 Jun 2013 04:04:36 AM CST, Bjorn Helgaas wrote:
> [+cc Konrad, Jeremy, xen-devel (users of interface you're deprecating)]
>
> On Sat, May 25, 2013 at 7:48 AM, Jiang Liu <liuj97@...il.com> wrote:
>> Mark pci_scan_bus_parented() as __deprecated and clean up outdated
>> comments.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
>> Cc: Chris Metcalf <cmetcalf@...era.com>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: Thierry Reding <thierry.reding@...onic-design.de>
>> Cc: linux-kernel@...r.kernel.org
>> Cc: linux-pci@...r.kernel.org
>> ---
>>  arch/tile/kernel/pci.c | 3 ---
>>  include/linux/pci.h    | 4 ++--
>>  2 files changed, 2 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
>> index 67237d3..936e087 100644
>> --- a/arch/tile/kernel/pci.c
>> +++ b/arch/tile/kernel/pci.c
>> @@ -309,9 +309,6 @@ int __init pcibios_init(void)
>>                          *
>>                          * It reads the PCI tree for this bus into the Linux
>>                          * data structures.
>> -                        *
>> -                        * This is inlined in linux/pci.h and calls into
>> -                        * pci_scan_bus_parented() in probe.c.
>>                          */
>>                         pci_add_resource(&resources, &ioport_resource);
>>                         pci_add_resource(&resources, &iomem_resource);
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index b0f4a82..7b23fa0 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -720,8 +720,8 @@ void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
>>  void pcibios_scan_specific_bus(int busn);
>>  struct pci_bus *pci_find_bus(int domain, int busnr);
>>  void pci_bus_add_devices(const struct pci_bus *bus);
>> -struct pci_bus *pci_scan_bus_parented(struct device *parent, int bus,
>> -                                     struct pci_ops *ops, void *sysdata);
>> +struct pci_bus * __deprecated pci_scan_bus_parented(struct device *parent,
>> +                       int bus, struct pci_ops *ops, void *sysdata);
>>  struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
>>  struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>>                                     struct pci_ops *ops, void *sysdata,
>
> I think this patch is a good idea, but I think we need to change the
> only existing user of pci_scan_bus_parented() (pcifront_scan_root() in
> drivers/pci/xen-pcifront.c) at the same time, so xen doesn't start
> getting build warnings.  The deprecation warnings are really intended
> for out-of-tree users that we aren't able to fix ourselves.
>
> I'm getting this series queued up in
> http://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=pci/jiang-bus-lock-v3,
> so if you want to send a patch just for xen, I can fold that in.
>
> Bjorn
Hi Bjorn,
        I have posted a big patch for that, but still need help from 
Xen experts to review it.
Please refer to https://patchwork.kernel.org/patch/2578551/
Thanks!
Gerry
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