linux-kernel - [PATCH tip/core/rcu 13/19] rcu: Make rcu_gp

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Message-Id: <20210511225304.2893154-13-paulmck@kernel.org>
Date:   Tue, 11 May 2021 15:52:58 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org,
        jiangshanlai@...il.com, akpm@...ux-foundation.org,
        mathieu.desnoyers@...icios.com, josh@...htriplett.org,
        tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 13/19] rcu: Make rcu_gp_cleanup() be noinline for tracing

Although there are trace events for RCU grace periods, these are only
enabled in CONFIG_RCU_TRACE=y kernels.  This commit therefore marks
rcu_gp_cleanup() noinline in order to provide a function that can be
traced that is invoked near the end of each grace period.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 00a3ebca70b8..6eb64e44bdcd 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2026,7 +2026,7 @@ static void rcu_gp_fqs_loop(void)
 /*
  * Clean up after the old grace period.
  */
-static void rcu_gp_cleanup(void)
+static noinline void rcu_gp_cleanup(void)
 {
 	int cpu;
 	bool needgp = false;
-- 
2.31.1.189.g2e36527f23