> Index: linux-2.6/kernel/perf_event.c
> ===================================================================
> --- linux-2.6.orig/kernel/perf_event.c
> +++ linux-2.6/kernel/perf_event.c
> @@ -668,15 +668,9 @@ group_sched_in(struct perf_event *group_
> }
> }
>
> - if (!txn)
> + if (!txn || !pmu->commit_txn(pmu))
> return 0;
>
> - ret = pmu->commit_txn(pmu);
> - if (!ret) {
> - pmu->cancel_txn(pmu);
> - return 0;
> - }
> -
> group_error:
> /*
> * Groups can be scheduled in as one unit only, so undo any
>
Looks okay.
I believe you can also drop the txn test in group_sched_in() after group_error:,
given you have the if !(txn) return 0.
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