linux-kernel - Re: [PATCH part2 4/6] x86, PCI: Separate rom resource claim out

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Date:	Mon, 17 Sep 2012 20:18:34 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, x86 <x86@...nel.org>,
	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-acpi@...r.kernel.org
Subject: Re: [PATCH part2 4/6] x86, PCI: Separate rom resource claim out

On Mon, Sep 17, 2012 at 4:38 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Sun, Sep 2, 2012 at 3:50 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> So could use it with hot-added root bus.
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> ---
>>  arch/x86/pci/i386.c |   58 ++++++++++++++++++++++++++++++++++++---------------
>>  1 files changed, 41 insertions(+), 17 deletions(-)
>>
>> diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
>> index 84696ed..4fdf0b2 100644
>> --- a/arch/x86/pci/i386.c
>> +++ b/arch/x86/pci/i386.c
>> @@ -298,27 +298,51 @@ static void __init pcibios_allocate_resources(struct pci_bus *bus, int pass)
>>         }
>>  }
>>
>> +static void __init __pcibios_allocate_rom_resources(struct pci_bus *bus)
>> +{
>> +       struct pci_dev *dev;
>> +       struct pci_bus *child;
>> +
>> +       list_for_each_entry(dev, &bus->devices, bus_list) {
>> +               pcibios_allocate_dev_rom_resource(dev);
>> +
>> +               child = dev->subordinate;
>> +               if (child)
>> +                       __pcibios_allocate_rom_resources(child);
>
> I really dislike the "__" prefix on the function names.  It seems
> pointless to add another function and the "__" when all you need is a
> test of PCI_ASSIGN_ROMS.  Also, it makes the structure of
> __pcibios_allocate_rom_resources() different from
> pcibios_allocate_resources() when they should be exactly the same.
>
> What if you made pcibios_assign_resources() look like this:
>
>     if (!!(pci_probe & PCI_ASSIGN_ROMS)) {
>         list_for_each_entry(bus, &pci_root_buses, node)
>             pcibios_allocate_rom_resources(bus);
>     }
>
> Then I don't think you'd need the extra function.

ok, will just move pci_probe checking back to
pcibios_allocate_rom_resources directly.

Yinghai
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