linux-kernel - Re: [PATCH v9 09/16] PCI, x86: implement pcibios_{add|remove}

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Message-ID: <CAErSpo7A3paLJ8u5FxPZpy=9yT_ZkXvEbcHbKLd7iMutdDaBUA@mail.gmail.com>
Date:	Tue, 16 Apr 2013 16:35:04 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Jiang Liu <liuj97@...il.com>, "Rafael J . Wysocki" <rjw@...k.pl>,
	Jiang Liu <jiang.liu@...wei.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Yijing Wang <wangyijing@...wei.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v9 09/16] PCI, x86: implement pcibios_{add|remove}_bus() hooks

On Tue, Apr 16, 2013 at 2:27 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Fri, 12 Apr 2013, Jiang Liu wrote:
>
>> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
>> index 901177d..305c68b 100644
>> --- a/arch/x86/pci/common.c
>> +++ b/arch/x86/pci/common.c
>> @@ -6,6 +6,7 @@
>>
>>  #include <linux/sched.h>
>>  #include <linux/pci.h>
>> +#include <linux/pci-acpi.h>
>>  #include <linux/ioport.h>
>>  #include <linux/init.h>
>>  #include <linux/dmi.h>
>> @@ -170,6 +171,16 @@ void pcibios_fixup_bus(struct pci_bus *b)
>>               pcibios_fixup_device_resources(dev);
>>  }
>>
>> +void pcibios_add_bus(struct pci_bus *bus)
>> +{
>> +     acpi_pci_add_bus(bus);
>> +}
>> +
>> +void pcibios_remove_bus(struct pci_bus *bus)
>> +{
>> +     acpi_pci_remove_bus(bus);
>> +}
>> +
>>  /*
>>   * Only use DMI information to set this if nothing was passed
>>   * on the kernel command line (which was parsed earlier).
>
> This causes build errors when CONFIG_ACPI isn't enabled since both
> acpi_pci_{add,remove}_bus() aren't defined in such a configuration:
>
> arch/x86/pci/common.c: In function 'pcibios_add_bus':
> arch/x86/pci/common.c:176:2: error: implicit declaration of function 'acpi_pci_add_bus'
> arch/x86/pci/common.c: In function 'pcibios_remove_bus':
> arch/x86/pci/common.c:181:2: error: implicit declaration of function 'acpi_pci_remove_bus'

Thanks for the report!

I'm pretty sure I fixed this:
http://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/commit/?h=pci/jiang-subdrivers&id=3b63aaa70e1ccc4b66d60acc78da09700706a703

The acpi_pci_add_bus()/acpi_pci_remove_bus() stubs for CONFIG_ACPI=n
were added early in the series (patch 07/16: "PCI/ACPI: Prepare stub
functions to handle ACPI PCI (hotplug) slots") but were mistakenly
removed in patch 12/16: "PCI: acpiphp: Do not use ACPI PCI subdriver
mechanism".

I updated my "next" branch with the fixed version of patch 12/16, so
the 20130417 linux-next tree should have the fix.

Bjorn
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