linux-kernel - Re: [PATCH] coresight: use const for device

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Date:   Wed, 3 May 2017 14:21:36 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coresight: use const for device_node structures

Hi Leo,

On Tue, May 02, 2017 at 04:15:03PM +0800, Leo Yan wrote:
> Almost low level functions from open firmware have used const to
> qualify device_node structures, so add const for device_node
> parameters in of_coresight related functions.
> 
> Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  drivers/hwtracing/coresight/of_coresight.c | 4 ++--
>  include/linux/coresight.h                  | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
> index 629e031..859ad49 100644
> --- a/drivers/hwtracing/coresight/of_coresight.c
> +++ b/drivers/hwtracing/coresight/of_coresight.c
> @@ -52,7 +52,7 @@ of_coresight_get_endpoint_device(struct device_node *endpoint)
>  			       endpoint, of_dev_node_match);
>  }
>  
> -static void of_coresight_get_ports(struct device_node *node,
> +static void of_coresight_get_ports(const struct device_node *node,
>  				   int *nr_inport, int *nr_outport)
>  {
>  	struct device_node *ep = NULL;
> @@ -102,7 +102,7 @@ static int of_coresight_alloc_memory(struct device *dev,
>  }
>  
>  struct coresight_platform_data *of_get_coresight_platform_data(
> -				struct device *dev, struct device_node *node)
> +			struct device *dev, const struct device_node *node)

The original code didn't do things right.  I suggest:

struct coresight_platform_data *
of_get_coresight_platform_data(struct device *dev,
                               const struct device_node *node)


>  {
>  	int i = 0, ret = 0, cpu;
>  	struct coresight_platform_data *pdata;
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 2a5982c..769f2c8 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -264,10 +264,10 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset,
>  
>  #ifdef CONFIG_OF
>  extern struct coresight_platform_data *of_get_coresight_platform_data(
> -				struct device *dev, struct device_node *node);
> +	struct device *dev, const struct device_node *node);

Same as above.

Please send me another revision and I'll pick this up for the next cycle.

Thanks,
Mathieu

>  #else
>  static inline struct coresight_platform_data *of_get_coresight_platform_data(
> -	struct device *dev, struct device_node *node) { return NULL; }
> +	struct device *dev, const struct device_node *node) { return NULL; }
>  #endif
>  
>  #ifdef CONFIG_PID_NS
> -- 
> 2.7.4
>