linux-kernel - Re: [PATCH] perf bpf-loader: Add missing '*' for key_scan

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Message-ID: <20200520070551.GC110644@krava>
Date:   Wed, 20 May 2020 09:05:51 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Wang ShaoBo <bobo.shaobowang@...wei.com>
Cc:     cj.chengjian@...wei.com, huawei.libin@...wei.com,
        xiexiuqi@...wei.com, mark.rutland@....com, guohanjun@...wei.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        wangnan0@...wei.com, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf bpf-loader: Add missing '*' for key_scan_pos

On Wed, May 20, 2020 at 11:32:16AM +0800, Wang ShaoBo wrote:
> key_scan_pos is a pointer for getting scan position in
> bpf__obj_config_map() for each BPF map configuration term,
> but it's misused when error not happened.
> 
> Fixes: 066dacbf2a32 ("perf bpf: Add API to set values to map entries in a bpf object")
> Signed-off-by: Wang ShaoBo <bobo.shaobowang@...wei.com>
> ---
>  tools/perf/util/bpf-loader.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
> index 10c187b8b8ea..460056bc072c 100644
> --- a/tools/perf/util/bpf-loader.c
> +++ b/tools/perf/util/bpf-loader.c
> @@ -1225,7 +1225,7 @@ bpf__obj_config_map(struct bpf_object *obj,
>  out:
>  	free(map_name);
>  	if (!err)
> -		key_scan_pos += strlen(map_opt);
> +		*key_scan_pos += strlen(map_opt);

seems good, was there something failing because of this?

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

>  	return err;
>  }
>  
> -- 
> 2.17.1
>