linux-kernel - Re: [PATCH 12/12] perf maps: Set maps pointer in the kmap area for kernel maps

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Date:   Wed, 18 Dec 2019 10:05:04 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 12/12] perf maps: Set maps pointer in the kmap area for
 kernel maps

On Tue, Dec 17, 2019 at 11:48:28AM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> +	machine->vmlinux_map = map__new2(0, kernel, &machine->kmaps);
>  	if (machine->vmlinux_map == NULL)
>  		return -1;
>  
> @@ -1098,7 +1097,6 @@ __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
>  	if (!kmap)
>  		return -1;
>  
> -	kmap->kmaps = &machine->kmaps;
>  	maps__insert(&machine->kmaps, map);
>  
>  	return 0;
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index fdd5bddb3075..a2cdfe62df94 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -223,7 +223,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
>   * they are loaded) and for vmlinux, where only after we load all the
>   * symbols we'll know where it starts and ends.
>   */
> -struct map *map__new2(u64 start, struct dso *dso)
> +struct map *map__new2(u64 start, struct dso *dso, struct maps *kmaps)
>  {
>  	struct map *map = calloc(1, (sizeof(*map) +
>  				     (dso->kernel ? sizeof(struct kmap) : 0)));
> @@ -232,6 +232,19 @@ struct map *map__new2(u64 start, struct dso *dso)
>  		 * ->end will be filled after we load all the symbols
>  		 */
>  		map__init(map, start, 0, 0, dso);

we are passing NULL for kmaps in some cases,
should we check it in here and warn?

		if (!WARN_ON_ONCE(!kmaps, "too bad..") && dso->kernel)
			

jirka