linux-kernel - [PATCH RFC rcu 15/19] srcu: Fix long lines in srcu_get

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Message-Id: <20230324001938.3443499-15-paulmck@kernel.org>
Date:   Thu, 23 Mar 2023 17:19:34 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, hch@....de,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH RFC rcu 15/19] srcu: Fix long lines in srcu_get_delay()

This commit creates an srcu_usage pointer named "sup" as a shorter
synonym for the "ssp->srcu_sup" that was bloating several lines of code.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Christoph Hellwig <hch@....de>
---
 kernel/rcu/srcutree.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 22dc266d2090..f6bb9fbe1b9c 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -616,17 +616,18 @@ static unsigned long srcu_get_delay(struct srcu_struct *ssp)
 	unsigned long gpstart;
 	unsigned long j;
 	unsigned long jbase = SRCU_INTERVAL;
+	struct srcu_usage *sup = ssp->srcu_sup;
 
-	if (ULONG_CMP_LT(READ_ONCE(ssp->srcu_sup->srcu_gp_seq), READ_ONCE(ssp->srcu_sup->srcu_gp_seq_needed_exp)))
+	if (ULONG_CMP_LT(READ_ONCE(sup->srcu_gp_seq), READ_ONCE(sup->srcu_gp_seq_needed_exp)))
 		jbase = 0;
-	if (rcu_seq_state(READ_ONCE(ssp->srcu_sup->srcu_gp_seq))) {
+	if (rcu_seq_state(READ_ONCE(sup->srcu_gp_seq))) {
 		j = jiffies - 1;
-		gpstart = READ_ONCE(ssp->srcu_sup->srcu_gp_start);
+		gpstart = READ_ONCE(sup->srcu_gp_start);
 		if (time_after(j, gpstart))
 			jbase += j - gpstart;
 		if (!jbase) {
-			WRITE_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay, READ_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay) + 1);
-			if (READ_ONCE(ssp->srcu_sup->srcu_n_exp_nodelay) > srcu_max_nodelay_phase)
+			WRITE_ONCE(sup->srcu_n_exp_nodelay, READ_ONCE(sup->srcu_n_exp_nodelay) + 1);
+			if (READ_ONCE(sup->srcu_n_exp_nodelay) > srcu_max_nodelay_phase)
 				jbase = 1;
 		}
 	}
-- 
2.40.0.rc2