linux-kernel - Re: [PATCH 14/54] perf tools: Support setting different slots in a BPF map separately

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Date:	Fri, 12 Feb 2016 15:23:41 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Cody P Schafer <dev@...yps.com>,
	"David S. Miller" <davem@...emloft.net>,
	He Kuang <hekuang@...wei.com>,
	Jérémie Galarneau 
	<jeremie.galarneau@...icios.com>, Jiri Olsa <jolsa@...nel.org>,
	Kirill Smelkov <kirr@...edi.com>,
	Li Zefan <lizefan@...wei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, pi3orama@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/54] perf tools: Support setting different slots in a
 BPF map separately

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