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Date: Fri, 12 Feb 2016 15:23:41 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
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        =?iso-8859-1?Q?J=E9r=E9mie?= Galarneau 
	<jeremie.galarneau@efficios.com>,
        Jiri Olsa <jolsa@kernel.org>, Kirill Smelkov <kirr@nexedi.com>,
        Li Zefan <lizefan@huawei.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, pi3orama@163.com,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 14/54] perf tools: Support setting different slots in a
 BPF map separately
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On Fri, Feb 05, 2016 at 02:01:39PM +0000, Wang Nan wrote:

SNIP

>  
> +int parse_events__merge_arrays(struct parse_events_array *dest,
> +			       struct parse_events_array *another)
> +{
> +	struct parse_events_array new;
> +
> +	if (!dest || !another)
> +		return -EINVAL;
> +
> +	new.nr_ranges = dest->nr_ranges + another->nr_ranges;
> +	new.ranges = malloc(sizeof(new.ranges[0]) * new.nr_ranges);
> +	if (!new.ranges)
> +		return -ENOMEM;
> +
> +	memcpy(&new.ranges[0], dest->ranges,
> +	       sizeof(new.ranges[0]) * dest->nr_ranges);
> +	memcpy(&new.ranges[dest->nr_ranges], another->ranges,
> +	       sizeof(new.ranges[0]) * another->nr_ranges);
> +	free(dest->ranges);
> +	free(another->ranges);
> +	*dest = new;
> +	return 0;
> +}

is there a user for this function in this patchset? can't find it..

I recall I've already seen it in earlier versions, but can't find it now ;-)

jirka