linux-kernel - RE: [PATCH] gpio: include <linux/gpio.h> not <asm/gpio.h>

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Message-ID: <BD79186B4FD85F4B8E60E381CAEE190901B77674@mi8nycmail19.Mi8.com>
Date:	Mon, 3 Aug 2009 18:17:29 -0400
From:	"H Hartley Sweeten" <hartleys@...ionengravers.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	<linux-kernel@...r.kernel.org>, <dbrownell@...rs.sourceforge.net>
Subject: RE: [PATCH] gpio: include <linux/gpio.h> not <asm/gpio.h>

On Monday, August 03, 2009 2:51 PM, Andrew Morton wrote:
>> Drivers should be including <linux/gpio.h> not <asm/gpio.h>.
>> 
>> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
>> 
>> ---
>> 
>> diff --git a/drivers/gpio/bt8xxgpio.c b/drivers/gpio/bt8xxgpio.c
>> index 984b587..fd1c54d 100644
>> --- a/drivers/gpio/bt8xxgpio.c
>> +++ b/drivers/gpio/bt8xxgpio.c
>> @@ -46,8 +46,7 @@
>>  #include <linux/module.h>
>>  #include <linux/pci.h>
>>  #include <linux/spinlock.h>
>> -
>> -#include <asm/gpio.h>
>> +#include <linux/gpio.h>
>
> There's some potential for breakage here.  include/linux/gpio.h has
>
> #ifdef CONFIG_GENERIC_GPIO
> #include <asm/gpio.h>
>
> #else
> 
> ...
>
> #endif
>
>
> So if there's some configuration which forgot to set
> CONFIG_GENERIC_GPIO, the driver will be switched over to use the
> include/linux/gpio.h stubs and will break.
>
> Please convince me that this cannot happen ;)

Can't happen for these drivers.  Everything in drivers/gpio requires
GPIOLIB which selects GENERIC_GPIO.  Please see drivers/gpio/Kconfig.

Thanks,
Hartley


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