From: Paul E. McKenney <paulmck@linux.ibm.com>
Date: Mon, 1 Oct 2018 20:25:32 +0000 (-0700)
Subject: rcu: Avoid double multiply by HZ
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b3c1d9ec7c59feadd22693f43145d8285bd35b04;p=linux.git

rcu: Avoid double multiply by HZ

The rcu_check_gp_start_stall() function multiplies the return value
from rcu_jiffies_till_stall_check() by HZ, but the units are already
in jiffies.  This commit therefore avoids the need for introduction of
a jiffies-squared unit by removing the extraneous multiplication.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
---

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 121f833acd046..4933f5d9d9928 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2603,7 +2603,7 @@ static void force_quiescent_state(void)
 static void
 rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp)
 {
-	const unsigned long gpssdelay = rcu_jiffies_till_stall_check() * HZ;
+	const unsigned long gpssdelay = rcu_jiffies_till_stall_check();
 	unsigned long flags;
 	unsigned long j;
 	struct rcu_node *rnp_root = rcu_get_root();