On 01/21, Oleg Nesterov wrote: > > In theory, almost every user of task->child->perf_event_ctxp[] > is wrong. find_get_context() can install the new context at any > moment, we need read_barrier_depends(). And perhaps it makes sense to fix them all, although the problem is only theoretical. > dbe08d82ce3967ccdf459f7951d02589cf967300 "perf: Fix > find_get_context() vs perf_event_exit_task() race" added > rcu_dereference() into perf_event_exit_task_context() to make > the precedent, but this makes __rcu_dereference_check() unhappy. > Use rcu_dereference_raw() to shut up the warning. But rcu_dereference_raw() looks a bit confusing, and it is not very convenient to use read_barrier_depends() directly. Paul, may be it makes sense to add the new trivial helper which can be used instead? Yes, this is only cosmetic issue, I know ;) Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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