Re: [PATCH bpf-next] bpf: allow bpf_perf_event_read_value in all BPF programs

[Daniel Borkmann <daniel@xxxxxxxxxxxxx>]

On 2/15/20 12:41 AM, Song Liu wrote:
> bpf_perf_event_read_value() is NMI safe. Enable it for all BPF programs.
> This can be used in fentry/fexit to profile BPF program and individual
> kernel function with hardware counters.
>
> Cc: Yonghong Song <yhs@xxxxxx>
> Signed-off-by: Song Liu <songliubraving@xxxxxx>

And ironically, we had that already for perf_event_read. Applied, thanks!