Re: [PATCH 1/1] Fix: trace sched switch start/stop racy updates

[Steven Rostedt]

On Sat, 17 Aug 2019 11:53:41 -0400 (EDT)
Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote:

> kernel/trace/trace.c:tracing_record_taskinfo_sched_switch()
> kernel/trace/trace.c:tracing_record_taskinfo()
> 
> where @flags is used to control a few branches. I don't think any of those
> would end up causing corruption if the flags is re-fetched between two
> branches, but it seems rather fragile.

There shouldn't be any corruption, as each flag test is not dependent
on any of the other tests. But I do agree, a READ_ONCE() would be
appropriate for just making a consistent state among the tests, even
though they are independent.

-- Steve