* Stephane Eranian <eran...@google.com> wrote:
> - if (is_cgroup_event(event))
> + if (is_cgroup_event(event)) {
> ctx->nr_cgroups--;
> + cpuctx = __get_cpu_context(ctx);
> + /*
> + * if there are no more cgroup events
> + * then clear cgrp to avoid stale pointer
> + * in update_cgrp_time_from_cpuctx()
> + */
> + if (!ctx->nr_cgroups)
> + cpuctx->cgrp = NULL;
> + }
The ->cgrp pointer does not exist on !CGROUPS kernels. I suspect the cleanest
approach would be to make those two cgrp fields available unconditionally in
struct perf_event.
Thanks,
Ingo
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