linux-kernel - Re: [PATCH RESEND] of: add const to struct of_device

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Date:	Fri, 22 Jun 2012 07:56:13 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	devicetree-discuss@...ts.ozlabs.org, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>
Cc:	kernel@...gutronix.de
Subject: Re: [PATCH RESEND] of: add const to struct of_device_id.data

On Thu, Jun 07, 2012 at 12:20:14PM +0200, Uwe Kleine-König wrote:
> Drivers should never need to modify the data of a device id. So it can
> be const which in turn allows more consts in the driver.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
> (Cc += lkml + Grant)
> 
> Hello,
> 
> this might introduce warnings in drivers that access the data member
> without using const, so this is definitly merge window material if it is
> considered at all.
ping

Best regards
Uwe

>  include/linux/mod_devicetable.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 501da4c..183f411 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -222,7 +222,7 @@ struct of_device_id
>  	char	type[32];
>  	char	compatible[128];
>  #ifdef __KERNEL__
> -	void	*data;
> +	const void *data;
>  #else
>  	kernel_ulong_t data;
>  #endif
> -- 
> 1.7.10
> 
> 
> 
> -- 
> Pengutronix e.K.                           | Uwe Kleine-König            |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> 

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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