linux-kernel - Re: [linux-pm] [PATCH 2/2 -stable] libata: add missing CONFIG

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Date:	Sat, 03 Mar 2007 12:20:35 +0900
From:	Tejun Heo <htejun@...il.com>
To:	nigel@...el.suspend2.net
CC:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-ide@...r.kernel.org, jgarzik@...ox.com,
	linux-pm@...ts.osdl.org, stable@...nel.org,
	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [PATCH 2/2 -stable] libata: add missing CONFIG_PM
 in LLDs

Hello, Nigel.

Nigel Cunningham wrote:
>> Index: work1/drivers/ata/ahci.c
>> ===================================================================
>> --- work1.orig/drivers/ata/ahci.c
>> +++ work1/drivers/ata/ahci.c
>> @@ -225,10 +225,12 @@ static void ahci_thaw(struct ata_port *a
>>  static void ahci_error_handler(struct ata_port *ap);
>>  static void ahci_vt8251_error_handler(struct ata_port *ap);
>>  static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
>> +#ifdef CONFIG_PM
>>  static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
>>  static int ahci_port_resume(struct ata_port *ap);
>>  static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
>>  static int ahci_pci_device_resume(struct pci_dev *pdev);
> 
> Wouldn't it be simpler to add
> 
> #else
> #define ahci_port_suspend(port, message) (NULL)
> 
> etc (or something similar)?

ahci_port_suspend() is used to fill ata_port_ops vector, so it needs to
be a function.  If you're talking about defining NULL function, yeah,
that will remove half of CONFIG_PMs but would require dummy definitions
for all functions.  I think both are ugly.  :-)

I'm working on a linker trick.  Please take a look at the following thread.

  http://thread.gmane.org/gmane.linux.ide/16475

-- 
tejun
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