linux-kernel - Re: [RFC PATCH v5 4/8] ACPI, PCI: avoid building pci

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Date:	Mon, 28 Jan 2013 14:09:22 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jiang Liu <liuj97@...il.com>, Jiang Liu <jiang.liu@...wei.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...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>
Subject: Re: [RFC PATCH v5 4/8] ACPI, PCI: avoid building pci_slot as module

On Sun, Jan 20, 2013 at 5:01 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Saturday, January 19, 2013 12:07:42 AM Jiang Liu wrote:
>> As discussed in thread at https://patchwork.kernel.org/patch/1946851/,
>> there's no value in supporting CONFIG_ACPI_PCI_SLOT=m any more.
>> So change Kconfig and code to only support building pci_slot as
>> built-in driver.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

I think we should eventually get rid of acpi_pci_register_driver() and
do this initialization directly from acpi_pci_root_add().  But
removing the module option here is a good first step.

Rafael, do you want to apply this (and [6/8]) via your tree?  If not,
I can take it.

>> ---
>>  drivers/acpi/Kconfig    |    5 +----
>>  drivers/acpi/internal.h |    5 +++++
>>  drivers/acpi/pci_slot.c |   13 +------------
>>  drivers/acpi/scan.c     |    1 +
>>  4 files changed, 8 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 0300bf6..7efd0d0 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -299,7 +299,7 @@ config ACPI_DEBUG_FUNC_TRACE
>>         is about half of the penalty and is rarely useful.
>>
>>  config ACPI_PCI_SLOT
>> -     tristate "PCI slot detection driver"
>> +     bool "PCI slot detection driver"
>>       depends on SYSFS
>>       default n
>>       help
>> @@ -308,9 +308,6 @@ config ACPI_PCI_SLOT
>>         i.e., segment/bus/device/function tuples, with physical slots in
>>         the system.  If you are unsure, say N.
>>
>> -       To compile this driver as a module, choose M here:
>> -       the module will be called pci_slot.
>> -
>>  config X86_PM_TIMER
>>       bool "Power Management Timer Support" if EXPERT
>>       depends on X86
>> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
>> index e050254..7374cfc 100644
>> --- a/drivers/acpi/internal.h
>> +++ b/drivers/acpi/internal.h
>> @@ -67,6 +67,11 @@ struct acpi_ec {
>>
>>  extern struct acpi_ec *first_ec;
>>
>> +#ifdef       CONFIG_ACPI_PCI_SLOT
>> +void acpi_pci_slot_init(void);
>> +#else
>> +static inline void acpi_pci_slot_init(void) { }
>> +#endif
>>  int acpi_pci_root_init(void);
>>  int acpi_ec_init(void);
>>  int acpi_ec_ecdt_probe(void);
>> diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
>> index d22585f..a7d7e77 100644
>> --- a/drivers/acpi/pci_slot.c
>> +++ b/drivers/acpi/pci_slot.c
>> @@ -330,19 +330,8 @@ static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
>>       {}
>>  };
>>
>> -static int __init
>> -acpi_pci_slot_init(void)
>> +void __init acpi_pci_slot_init(void)
>>  {
>>       dmi_check_system(acpi_pci_slot_dmi_table);
>>       acpi_pci_register_driver(&acpi_pci_slot_driver);
>> -     return 0;
>>  }
>> -
>> -static void __exit
>> -acpi_pci_slot_exit(void)
>> -{
>> -     acpi_pci_unregister_driver(&acpi_pci_slot_driver);
>> -}
>> -
>> -module_init(acpi_pci_slot_init);
>> -module_exit(acpi_pci_slot_exit);
>> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
>> index f8a0d0f..cb964ac 100644
>> --- a/drivers/acpi/scan.c
>> +++ b/drivers/acpi/scan.c
>> @@ -1732,6 +1732,7 @@ int __init acpi_scan_init(void)
>>
>>       acpi_power_init();
>>       acpi_pci_root_init();
>> +     acpi_pci_slot_init();
>>
>>       /*
>>        * Enumerate devices in the ACPI namespace.
>>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
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