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Message-Id: <20200221134216.051596115@infradead.org>
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Date:   Fri, 21 Feb 2020 14:34:32 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
        rostedt@goodmis.org
Cc:     peterz@infradead.org, mingo@kernel.org, joel@joelfernandes.org,
        gregkh@linuxfoundation.org, gustavo@embeddedor.com,
        tglx@linutronix.de, paulmck@kernel.org, josh@joshtriplett.org,
        mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com,
        luto@kernel.org, tony.luck@intel.com, frederic@kernel.org,
        dan.carpenter@oracle.com, mhiramat@kernel.org
Subject: [PATCH v4 16/27] tracing: Remove regular RCU context for _rcuidle tracepoints (again)
References: <20200221133416.777099322@infradead.org>
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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>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.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)