linux-kernel - Re: [PATCH v4 01/12] perf util: Create rblist_

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Date:   Thu, 30 Nov 2017 16:30:22 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v4 01/12] perf util: Create rblist__reset() function

Em Thu, Nov 30, 2017 at 07:56:31PM +0800, Jin Yao escreveu:
> Currently we have a rblist__delete() which is used to delete a rblist.
> While rblist__delete() will free the pointer of rblist at the end.
> 
> It's inconvenience for user to delete a rblist which is not allocated
> by something like malloc(). For example, the rblist is defined in a
> data structure.

> This patch creates a new function rblist__reset() which function is
> similar as rblist__delete() but it will not free the rblist.

So, we've been using, mostly consistently:

int foo__init(struct foo *foo)
{
	foo->a = 1;
	foo->b = malloc(10);
	if (foo->b == NULL)
		return -1;
	return 0;
}

struct foo *foo__new(parameters)
{
	struct foo *foo = zalloc(sizeof(*foo));

	if (foo && foo__init(foo))
		goto out_delete;

	return foo;
out_delete:
	foo__delete(foo);
	return NULL);
}

void foo__exit(struct foo *foo)
{
	zfree(&foo->b);
}

void foo__delete(struct foo *foo)
{
	if (!foo)
		return;

	foo__exit(foo);
	free(foo);
}

So, please use delete+exit and new+init, i.e. replace 'reset' with
'exit' and 'free' with 'delete' (I saw this case in another patch), for
us to try and make all this more consistent, ok?

Thanks,

- Arnaldo
 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/util/rblist.c | 24 +++++++++++++++++-------
>  tools/perf/util/rblist.h |  1 +
>  2 files changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/util/rblist.c b/tools/perf/util/rblist.c
> index 0dfe27d..eafa663 100644
> --- a/tools/perf/util/rblist.c
> +++ b/tools/perf/util/rblist.c
> @@ -101,20 +101,30 @@ void rblist__init(struct rblist *rblist)
>  	return;
>  }
>  
> +static void remove_nodes(struct rblist *rblist)
> +{
> +	struct rb_node *pos, *next = rb_first(&rblist->entries);
> +
> +	while (next) {
> +		pos = next;
> +		next = rb_next(pos);
> +		rblist__remove_node(rblist, pos);
> +	}
> +}
> +
>  void rblist__delete(struct rblist *rblist)
>  {
>  	if (rblist != NULL) {
> -		struct rb_node *pos, *next = rb_first(&rblist->entries);
> -
> -		while (next) {
> -			pos = next;
> -			next = rb_next(pos);
> -			rblist__remove_node(rblist, pos);
> -		}
> +		remove_nodes(rblist);
>  		free(rblist);
>  	}
>  }
>  
> +void rblist__reset(struct rblist *rblist)
> +{
> +	remove_nodes(rblist);
> +}
> +
>  struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
>  {
>  	struct rb_node *node;
> diff --git a/tools/perf/util/rblist.h b/tools/perf/util/rblist.h
> index 4c8638a..048c285 100644
> --- a/tools/perf/util/rblist.h
> +++ b/tools/perf/util/rblist.h
> @@ -35,6 +35,7 @@ void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node);
>  struct rb_node *rblist__find(struct rblist *rblist, const void *entry);
>  struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry);
>  struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx);
> +void rblist__reset(struct rblist *rblist);
>  
>  static inline bool rblist__empty(const struct rblist *rblist)
>  {
> -- 
> 2.7.4