linux-kernel - Re: [PATCH] iio: declare struct to fix warning

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Date:	Thu, 30 Jul 2015 17:26:47 +0800
From:	Pengyu Ma <pengyu.ma@...driver.com>
To:	<jic23@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-iio@...r.kernel.org>
Subject: Re: [PATCH] iio: declare struct to fix warning

Since my email doesn't subscribe lkml, I will send again with my gmail

Pengyu

On 07/30/2015 05:18 PM, Pengyu Ma wrote:
> When compile iio related driver the following warning shown:
>
> include/linux/iio/trigger.h:35:34: warning: 'struct iio_trigger'
> declared inside parameter list
>    int (*set_trigger_state)(struct iio_trigger *trig, bool state);
>
> include/linux/iio/trigger.h:38:18: warning: 'struct iio_dev'
> declared inside parameter list
>             struct iio_dev *indio_dev);
>
> 1st warning: 'struct iio_trigger' was used before declaration;
> 2nd warning: 'struct iio_dev' was used without including head file.
>
> Signed-off-by: Pengyu Ma <pengyu.ma@...driver.com>
> ---
>   include/linux/iio/trigger.h | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
> index 68f46cd..cbe4286 100644
> --- a/include/linux/iio/trigger.h
> +++ b/include/linux/iio/trigger.h
> @@ -9,6 +9,7 @@
>   #include <linux/irq.h>
>   #include <linux/module.h>
>   #include <linux/atomic.h>
> +#include <linux/iio/iio.h>
>   
>   #ifndef _IIO_TRIGGER_H_
>   #define _IIO_TRIGGER_H_
> @@ -18,6 +19,8 @@ struct iio_subirq {
>   	bool enabled;
>   };
>   
> +struct iio_trigger; /* forward declaration */
> +
>   /**
>    * struct iio_trigger_ops - operations structure for an iio_trigger.
>    * @owner:		used to monitor usage count of the trigger.

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