[PATCH 8/8] tracing: Remove regular RCU context for _rcuidle tracepoints (again)

Peter Zijlstra
2020-02-12T09:44:04Z

Effectively revert commit 865e63b04e9b2 ("tracing: Add back in
rcu_irq_enter/exit_irqson() for rcuidle tracepoints") now that we've
taught perf how to deal with not having an RCU context provided.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
include/linux/tracepoint.h | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)

--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -179,10 +179,8 @@ static inline struct tracepoint *tracepo
* For rcuidle callers, use srcu since sched-rcu \
* doesn't work from the idle path. \
*/ \
- if (rcuidle) { \
+ if (rcuidle) \
__idx = srcu_read_lock_notrace(&tracepoint_srcu);\
- rcu_irq_enter_irqsave(); \
- } \
\
it_func_ptr = rcu_dereference_raw((tp)->funcs); \
\
@@ -194,10 +192,8 @@ static inline struct tracepoint *tracepo
} while ((++it_func_ptr)->func); \
} \
\
- if (rcuidle) { \
- rcu_irq_exit_irqsave(); \
+ if (rcuidle) \
srcu_read_unlock_notrace(&tracepoint_srcu, __idx);\
- } \
\
preempt_enable_notrace(); \
} while (0)