netdev - Re: [PATCH] perf stat: Fix error return code in bperf_

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Date:   Tue, 1 Jun 2021 10:52:42 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Yu Kuai <yukuai3@...wei.com>, Song Liu <songliubraving@...com>
Cc:     peterz@...radead.org, mingo@...hat.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, yi.zhang@...wei.com
Subject: Re: [PATCH] perf stat: Fix error return code in bperf__load()

Em Mon, May 17, 2021 at 04:12:54PM +0800, Yu Kuai escreveu:
> Fix to return a negative error code from the error handling
> case instead of 0, as done elsewhere in this function.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Applied, but I had to add Song to the CC list and also add this line:

Fixes: 7fac83aaf2eecc9e ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF")

So that the stable@...nel.org folks can get this auto-collected.

Perhaps you guys can make Hulk do that as well? :-)

Thanks,

- Arnaldo

> ---
>  tools/perf/util/bpf_counter.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
> index ddb52f748c8e..843b20aa6688 100644
> --- a/tools/perf/util/bpf_counter.c
> +++ b/tools/perf/util/bpf_counter.c
> @@ -522,6 +522,7 @@ static int bperf__load(struct evsel *evsel, struct target *target)
>  	evsel->bperf_leader_link_fd = bpf_link_get_fd_by_id(entry.link_id);
>  	if (evsel->bperf_leader_link_fd < 0 &&
>  	    bperf_reload_leader_program(evsel, attr_map_fd, &entry))
> +		err = -1;
>  		goto out;
>  
>  	/*
> @@ -550,6 +551,7 @@ static int bperf__load(struct evsel *evsel, struct target *target)
>  	/* Step 2: load the follower skeleton */
>  	evsel->follower_skel = bperf_follower_bpf__open();
>  	if (!evsel->follower_skel) {
> +		err = -1;
>  		pr_err("Failed to open follower skeleton\n");
>  		goto out;
>  	}
> -- 
> 2.25.4
> 

-- 

- Arnaldo