linux-kernel - Re: [PATCH] usb: host: xhci: Move suspend ops under PM

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Date:	Thu, 12 Dec 2013 21:01:04 -0500
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] usb: host: xhci: Move suspend ops under PM_SLEEP to avoid
 warning

On Thursday 12 December 2013 08:51 PM, David Cohen wrote:
> On Thu, Dec 12, 2013 at 08:06:24PM -0500, Santosh Shilimkar wrote:
>> Otherwise you get below build warnings
>>
>> drivers/usb/host/xhci-plat.c:201:12: warning: ‘xhci_plat_suspend’ defined but not used [-Wunused-function]
>> drivers/usb/host/xhci-plat.c:209:12: warning: ‘xhci_plat_resume’ defined but not used [-Wunused-function]
>>
>> Cc: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...com>
>> ---
>>  drivers/usb/host/xhci-plat.c |    4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
>> index d9c169f..4875be5 100644
>> --- a/drivers/usb/host/xhci-plat.c
>> +++ b/drivers/usb/host/xhci-plat.c
>> @@ -197,7 +197,7 @@ static int xhci_plat_remove(struct platform_device *dev)
>>  	return 0;
>>  }
>>  
>> -#ifdef CONFIG_PM
>> +#ifdef CONFIG_PM_SLEEP
> 
> Can't you just remove these #ifdefs altogether?
> xhci_plat_pm_ops is set using SET_SYSTEM_SLEEP_PM_OPS() macro which
> already handles '#ifdef CONFIG_PM_SLEEP' case.
> 
It does handle the difference but the hooks implemented would
show-up un-used warning if you remove the #ifdefs.

drivers/usb/host/xhci-plat.c:200:12: warning: ‘xhci_plat_suspend’ defined but not used [-Wunused-function]
drivers/usb/host/xhci-plat.c:208:12: warning: ‘xhci_plat_resume’ defined but not used [-Wunused-function]

So you need to wrap them under the PM_SLEEP check.

Regards,
Santosh

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