[tip: core/rcu] rcu: Make rcu_gp_cleanup() be noinline for tracing

[tip-bot2 for Paul E. McKenney]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     2f20de99a63b0de9bcceedafc3281e65fbf7d4fd
Gitweb:        https://git.kernel.org/tip/2f20de99a63b0de9bcceedafc3281e65fbf7d4fd
Author:        Paul E. McKenney <paulmck@xxxxxxxxxx>
AuthorDate:    Sun, 11 Apr 2021 10:49:52 -07:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 10 May 2021 16:22:54 -07:00

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@xxxxxxxxxx>
---
 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 00a3ebc..6eb64e4 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;