tracing: Fix synchronizing to event changes with tracepoint_synchronize_unregister()

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Now that some trace events can be protected by srcu_read_lock(tracepoint_srcu),
we need to make sure all locations that depend on this are also protected.
There were many places that did a synchronize_sched() thinking that it was
enough to protect againts access to trace events. This use to be the case,
but now that we use SRCU for _rcuidle() trace events, they may not be
protected by synchronize_sched(), as they may be called in paths that RCU is
not watching for preempt disable.

Fixes: e6753f23d9 ("tracepoint: Make rcuidle tracepoint callers use SRCU")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Steven Rostedt (VMware) 2018-08-09 15:31:48 -04:00

parent b207de3ec5

commit e0a568dcd1

4 changed files with 17 additions and 14 deletions

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8

kernel/trace/trace_events.c

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15

kernel/trace/trace_events_filter.c

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2

kernel/trace/trace_events_hist.c

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6

kernel/trace/trace_events_trigger.c

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