Re: [FIX bpf,perf] bpf,perf: return EOPNOTSUPP for bpf handler on PERF_COUNT_SW_DUMMY

[Martin KaFai Lau]

On Mon, Nov 16, 2020 at 07:37:52PM +0100, Florian Lehner wrote:
> bpf handlers for perf events other than tracepoints, kprobes or uprobes
> are attached to the overflow_handler of the perf event.
> 
> Perf events of type software/dummy are placeholder events. So when
> attaching a bpf handle to an overflow_handler of such an event, the bpf
> handler will not be triggered.
> 
> This fix returns the error EOPNOTSUPP to indicate that attaching a bpf
> handler to a perf event of type software/dummy is not supported.
> 
> Signed-off-by: Florian Lehner <dev@xxxxxxxxxxx>
It is missing a Fixes tag.