linux-kernel - Re: [PATCH v9 3/9] perf config: Collect configs to handle config variables

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Date:	Tue, 3 Nov 2015 21:10:50 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Taeung Song <treeze.taeung@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v9 3/9] perf config: Collect configs to handle config
 variables

On Tue, Nov 03, 2015 at 10:50:14AM +0900, Taeung Song wrote:
> Collecting configs into list because of two reason.
> 
> First of all, if there are same variables both user
> and system config file, they all will be printed
> when 'list' command work. But if config variables are
> duplicated, user config variables should only be printed
> because it has priority.
> 
> Lastly, list into which configs is collected
> will be required to keep and handle config variables
> and values in the near furture. For example,
> getting or setting functionality.
> 
> And change show_config() function.
> Old show_config() worked depending on perf_config().
> New show_config() work using collected configs list.
> 
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

One nitpick again..


[SNIP]
> +static int collect_current_config(const char *var, const char *value,
> +				  void *spec_sections __maybe_unused)

The spec_sections is actually used, so "__maybe_unused" is not necessary.

Thanks,
Namhyung


> +{
> +	int ret = -1;
> +	char *ptr, *key;
> +	char *section_name, *name;
> +	struct config_section *section = NULL;
> +	struct config_element *element = NULL;
> +	struct list_head *sections = (struct list_head *)spec_sections;
> +
> +	key = ptr = strdup(var);
> +	if (!key) {
> +		pr_err("%s: strdup failed\n", __func__);
> +		return -1;
> +	}
> +
> +	section_name = strsep(&ptr, ".");
> +	name = ptr;
> +	if (name == NULL || value == NULL)
> +		goto out_err;
> +
> +	find_config(sections, &section, &element, section_name, name);
> +
> +	if (!section) {
> +		section = init_section(section_name);
> +		if (!section)
> +			goto out_err;
> +		list_add_tail(&section->list, sections);
> +	}
> +
> +	value = strdup(value);
> +	if (!value) {
> +		pr_err("%s: strdup failed\n", __func__);
> +		goto out_err;
> +	}
> +
> +	if (!element)
> +		add_element(&section->element_head, name, value);
> +	else {
> +		free(element->value);
> +		element->value = (char *)value;
> +	}
> +
> +	ret = 0;
> +out_err:
> +	free(key);
> +	return ret;
> +}
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