linux-kernel - [PATCH tip/core/rcu 01/24] rcu: Inline increment_cpu_stall

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Message-Id: <20180829225405.7275-1-paulmck@linux.vnet.ibm.com>
Date:   Wed, 29 Aug 2018 15:53:42 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.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@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 01/24] rcu: Inline increment_cpu_stall_ticks() into its sole caller

Consolidation of the RCU flavors into one makes increment_cpu_stall_ticks()
a trivial one-line function with only one caller.  This commit therefore
inlines it.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c        | 2 +-
 kernel/rcu/tree.h        | 1 -
 kernel/rcu/tree_plugin.h | 6 ------
 3 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 91f5d612502a..35a4346c7cce 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2554,7 +2554,7 @@ static void rcu_do_batch(struct rcu_data *rdp)
 void rcu_check_callbacks(int user)
 {
 	trace_rcu_utilization(TPS("Start scheduler-tick"));
-	increment_cpu_stall_ticks();
+	raw_cpu_inc(rcu_data.ticks_this_gp);
 	rcu_flavor_check_callbacks(user);
 	if (rcu_pending())
 		invoke_rcu_core();
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 8abc15c42d84..46452d3d0fad 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -466,7 +466,6 @@ static void print_cpu_stall_info_begin(void);
 static void print_cpu_stall_info(int cpu);
 static void print_cpu_stall_info_end(void);
 static void zero_cpu_stall_ticks(struct rcu_data *rdp);
-static void increment_cpu_stall_ticks(void);
 static bool rcu_nocb_cpu_needs_barrier(int cpu);
 static struct swait_queue_head *rcu_nocb_gp_get(struct rcu_node *rnp);
 static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq);
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 878a1d2cd465..cd276c46bc14 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1815,12 +1815,6 @@ static void zero_cpu_stall_ticks(struct rcu_data *rdp)
 	rdp->softirq_snap = kstat_softirqs_cpu(RCU_SOFTIRQ, smp_processor_id());
 }
 
-/* Increment ->ticks_this_gp for all flavors of RCU. */
-static void increment_cpu_stall_ticks(void)
-{
-	raw_cpu_inc(rcu_data.ticks_this_gp);
-}
-
 #ifdef CONFIG_RCU_NOCB_CPU
 
 /*
-- 
2.17.1