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bpf: perf event change needed for subsequent bpf helpers

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This patch does not impact existing functionalities.
It contains the changes in perf event area needed for
subsequent bpf_perf_event_read_value and
bpf_perf_prog_read_value helpers.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yonghong Song
2017-10-05 09:19:19 -07:00
committed by David S. Miller
parent bdc476413d
commit 97562633bc
4 changed files with 20 additions and 6 deletions
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kernel/trace/bpf_trace.c
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@@ -275,7 +275,7 @@ BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags)
if (!ee)
return -ENOENT;
err = perf_event_read_local(ee->event, &value);
err = perf_event_read_local(ee->event, &value, NULL, NULL);
/*
* this api is ugly since we miss [-22..-2] range of valid
* counter values, but that's uapi