linux-kernel - Re: [PATCH] perf bpf filter: Fix a broken perf sample data naming in BPF

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Date:   Fri, 26 May 2023 15:22:01 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Song Liu <song@...nel.org>,
        bpf@...r.kernel.org
Subject: Re: [PATCH] perf bpf filter: Fix a broken perf sample data naming in
 BPF

Em Thu, May 25, 2023 at 11:53:09PM -0700, John Fastabend escreveu:
> Namhyung Kim wrote:
> > BPF CO-RE requires 3 underscores for the ignored suffix rule but it
> > mistakenly used only 2.  Let's fix it.
> > 
> > Fixes: 3a8b8fc31748 ("perf bpf filter: Support pre-5.16 kernels where 'mem_hops' isn't in 'union perf_mem_data_src'")
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> >  tools/perf/util/bpf_skel/sample_filter.bpf.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/perf/util/bpf_skel/sample_filter.bpf.c b/tools/perf/util/bpf_skel/sample_filter.bpf.c
> > index cffe493af1ed..fb94f5280626 100644
> > --- a/tools/perf/util/bpf_skel/sample_filter.bpf.c
> > +++ b/tools/perf/util/bpf_skel/sample_filter.bpf.c
> > @@ -25,7 +25,7 @@ struct perf_sample_data___new {
> >  } __attribute__((preserve_access_index));
> >  
> >  /* new kernel perf_mem_data_src definition */
> > -union perf_mem_data_src__new {
> > +union perf_mem_data_src___new {
> >  	__u64 val;
> >  	struct {
> >  		__u64   mem_op:5,	/* type of opcode */
> > @@ -108,7 +108,7 @@ static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
> >  		if (entry->part == 7)
> >  			return kctx->data->data_src.mem_blk;
> >  		if (entry->part == 8) {
> > -			union perf_mem_data_src__new *data = (void *)&kctx->data->data_src;
> > +			union perf_mem_data_src___new *data = (void *)&kctx->data->data_src;
> >  
> >  			if (bpf_core_field_exists(data->mem_hops))
> >  				return data->mem_hops;
> > -- 
> > 2.41.0.rc0.172.g3f132b7071-goog
> > 
> > 
> 
> Acked-by: John Fastabend <john.fastabend@...il.com>

Thanks, applied.

- Arnaldo