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

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Date:   Tue, 1 Jun 2021 10:55:52 -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 Tue, Jun 01, 2021 at 10:52:42AM -0300, Arnaldo Carvalho de Melo escreveu:
> 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,

Something else to teach Hulk:

util/bpf_counter.c: In function ‘bperf__load’:
util/bpf_counter.c:523:9: error: this ‘if’ clause does not guard... [-Werror=misleading-indentation]
  523 |         if (evsel->bperf_leader_link_fd < 0 &&
      |         ^~
util/bpf_counter.c:526:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
  526 |                 goto out;
      |                 ^~~~
cc1: all warnings being treated as errors

I'm adding the missing {} for the now multiline if block.

- 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

-- 

- Arnaldo