Re: [PATCH net-next v4 1/2] bpf/tracing: allow user space to query prog array on the same tp

[Peter Zijlstra]

On Mon, Dec 11, 2017 at 11:39:02AM -0800, Yonghong Song wrote:
> The usage:
>   struct perf_event_query_bpf *query = malloc(...);
>   query.ids_len = ids_len;
>   err = ioctl(pmu_efd, PERF_EVENT_IOC_QUERY_BPF, &query);

You didn't spot the fixes to your changelog ;-) The above should read
something like:

    struct perf_event_query_bpf *query =
        malloc(sizeof(*query) + sizeof(u32) * ids_len);
    query->ids_len = ids_len;
    err = ioctl(pmu_efd, PERF_EVENT_IOC_QUERY_BPF, query);