linux-kernel - [RFC 2/3] Revert "tracing: Add back in rcu_irq_enter/exit

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Date:   Fri,  7 Feb 2020 15:56:55 -0500
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ingo Molnar <mingo@...hat.com>,
        Richard Fontana <rfontana@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: [RFC 2/3] Revert "tracing: Add back in rcu_irq_enter/exit_irqson() for rcuidle tracepoints"

This reverts commit 865e63b04e9b2a658d7f26bd13a71dcd964a9118.

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 include/linux/tracepoint.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 59463c90fdc3d..ab1f13b7f7d2c 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -179,10 +179,8 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 		 * 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_irqson();				\
-		}							\
 									\
 		it_func_ptr = rcu_dereference_raw((tp)->funcs);		\
 									\
@@ -194,10 +192,8 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 			} while ((++it_func_ptr)->func);		\
 		}							\
 									\
-		if (rcuidle) {						\
-			rcu_irq_exit_irqson();				\
+		if (rcuidle)						\
 			srcu_read_unlock_notrace(&tracepoint_srcu, idx);\
-		}							\
 									\
 		preempt_enable_notrace();				\
 	} while (0)
-- 
2.25.0.341.g760bfbb309-goog