Subject: [patch net-next 0/3] net/sched: Improve getting objects by indexes

From: [email-masked] (Frank Rowand)
Date: Wed, 16 Aug 2017 14:51:23 -0700

I deleted most of the distribution list.  My email server rejects an email
with this many recipients.

On 08/15/17 19:12, Chris Mi wrote:
> IDR uses internally radix tree which uses unsigned long. It doesn't
> makes sense to have index as signed value.
> 
> Signed-off-by: Chris Mi <[email-masked]>
> Signed-off-by: Jiri Pirko <[email-masked]>
> ---

< snip >

>  drivers/of/overlay.c                            | 15 +++----
>  drivers/of/unittest.c                           | 25 ++++++-----

< snip >

>  include/linux/of.h                              |  4 +-

< snip >

Split the patch apart.

> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index c0e4ee1..e5cfe01 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -373,10 +373,11 @@ static int of_free_overlay_info(struct of_overlay *ov)
>   *
>   * Returns the id of the created overlay, or a negative error number
>   */
> -int of_overlay_create(struct device_node *tree)
> +int of_overlay_create(struct device_node *tree, unsigned long *id)

Added parameter *id, but never assigned a value to it.

>  {
>  	struct of_overlay *ov;
> -	int err, id;
> +	unsigned long idr_index;
> +	int err;
>  
>  	/* allocate the overlay structure */
>  	ov = kzalloc(sizeof(*ov), GFP_KERNEL);
> @@ -390,12 +391,10 @@ int of_overlay_create(struct device_node *tree)
>  
>  	mutex_lock(&of_mutex);
>  
> -	id = idr_alloc(&ov_idr, ov, 0, 0, GFP_KERNEL);
> -	if (id < 0) {
> -		err = id;
> +	err = idr_alloc(&ov_idr, ov, &idr_index, 0, 0, GFP_KERNEL);
> +	if (err)
>  		goto err_destroy_trans;
> -	}
> -	ov->id = id;
> +	ov->id = idr_index;
>  
>  	/* build the overlay info structures */
>  	err = of_build_overlay_info(ov, tree);
> @@ -430,7 +429,7 @@ int of_overlay_create(struct device_node *tree)
>  
>  	mutex_unlock(&of_mutex);
>  
> -	return id;
> +	return err;
>  
>  err_revert_overlay:
>  err_abort_trans:
> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> index 0107fc6..ac7cc76 100644
> --- a/drivers/of/unittest.c
> +++ b/drivers/of/unittest.c
> @@ -1242,7 +1242,8 @@ static int of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
>  		int *overlay_id)
>  {
>  	struct device_node *np = NULL;
> -	int ret, id = -1;
> +	unsigned long id = -1;

Assigns a negative value to an unsigned.

> +	int ret;
>  
>  	np = of_find_node_by_path(overlay_path(overlay_nr));
>  	if (np == NULL) {
> @@ -1252,17 +1253,14 @@ static int of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
>  		goto out;
>  	}
>  
> -	ret = of_overlay_create(np);
> -	if (ret < 0) {
> +	ret = of_overlay_create(np, &id);
> +	if (ret) {
>  		unittest(0, "could not create overlay from \"%s\"\n",
>  				overlay_path(overlay_nr));
>  		goto out;
>  	}
> -	id = ret;
>  	of_unittest_track_overlay(id);
>  
> -	ret = 0;
> -
>  out:
>  	of_node_put(np);
>  
> @@ -1442,6 +1440,7 @@ static void of_unittest_overlay_6(void)
>  	int ret, i, ov_id[2];
>  	int overlay_nr = 6, unittest_nr = 6;
>  	int before = 0, after = 1;
> +	unsigned long id;
>  
>  	/* unittest device must be in before state */
>  	for (i = 0; i < 2; i++) {
> @@ -1466,13 +1465,13 @@ static void of_unittest_overlay_6(void)
>  			return;
>  		}
>  
> -		ret = of_overlay_create(np);
> -		if (ret < 0)  {
> +		ret = of_overlay_create(np, &id);
> +		if (ret)  {
>  			unittest(0, "could not create overlay from \"%s\"\n",
>  					overlay_path(overlay_nr + i));
>  			return;
>  		}
> -		ov_id[i] = ret;
> +		ov_id[i] = id;
>  		of_unittest_track_overlay(ov_id[i]);
>  	}
>  
> @@ -2094,6 +2093,7 @@ static int __init overlay_data_add(int onum)
>  	int ret;
>  	u32 size;
>  	u32 size_from_header;
> +	unsigned long id;
>  
>  	for (k = 0, info = overlays; info; info++, k++) {
>  		if (k == onum)
> @@ -2138,13 +2138,12 @@ static int __init overlay_data_add(int onum)
>  		goto out_free_np_overlay;
>  	}
>  
> -	ret = of_overlay_create(info->np_overlay);
> -	if (ret < 0) {
> +	ret = of_overlay_create(info->np_overlay, &id);
> +	if (ret) {
>  		pr_err("of_overlay_create() (ret=%d), %d\n", ret, onum);
>  		goto out_free_np_overlay;
>  	} else {
> -		info->overlay_id = ret;
> -		ret = 0;
> +		info->overlay_id = id;
>  	}
>  
>  	pr_debug("__dtb_overlay_begin applied, overlay id %d\n", ret);

> diff --git a/include/linux/of.h b/include/linux/of.h
> index 4a8a709..ceb14bf 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -1307,7 +1307,7 @@ struct of_overlay_notify_data {
>  #ifdef CONFIG_OF_OVERLAY
>  
>  /* ID based overlays; the API for external users */
> -int of_overlay_create(struct device_node *tree);
> +int of_overlay_create(struct device_node *tree, *unsigned long *id);

*unsigned long *id should be: unsigned long *id

How did you test this patch?

>  int of_overlay_destroy(int id);
>  int of_overlay_destroy_all(void);
>  
> @@ -1316,7 +1316,7 @@ struct of_overlay_notify_data {
>  
>  #else
>  
> -static inline int of_overlay_create(struct device_node *tree)
> +static inline int of_overlay_create(struct device_node *tree, unsigned long *id)
>  {
>  	return -ENOTSUPP;
>  }