linux-kernel - [PATCH 4/8] sched,rcu,tracing: Mark preempt_count

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Date:   Wed, 12 Feb 2020 10:32:14 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        rostedt@...dmis.org
Cc:     peterz@...radead.org, mingo@...nel.org, joel@...lfernandes.org,
        gregkh@...uxfoundation.org, gustavo@...eddedor.com,
        tglx@...utronix.de, paulmck@...nel.org, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com
Subject: [PATCH 4/8] sched,rcu,tracing: Mark preempt_count_{add,sub}() notrace

Because of the requirement that no tracing happens until after we've
incremented preempt_count, see nmi_enter() / trace_rcu_enter(), mark
these functions as notrace.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/sched/core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3781,7 +3781,7 @@ static inline void preempt_latency_start
 	}
 }
 
-void preempt_count_add(int val)
+void notrace preempt_count_add(int val)
 {
 #ifdef CONFIG_DEBUG_PREEMPT
 	/*
@@ -3813,7 +3813,7 @@ static inline void preempt_latency_stop(
 		trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip());
 }
 
-void preempt_count_sub(int val)
+void notrace preempt_count_sub(int val)
 {
 #ifdef CONFIG_DEBUG_PREEMPT
 	/*