linux-kernel - [PATCH 1/4] rcu: gp_max is protected by root rcu

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Message-Id: <20200612020755.50526-2-richard.weiyang@linux.alibaba.com>
Date:   Fri, 12 Jun 2020 10:07:52 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     paulmck@...nel.org, josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        joel@...lfernandes.org, trivial@...nel.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: [PATCH 1/4] rcu: gp_max is protected by root rcu_node's lock

gp_max is protected by root rcu_node's lock, let's move the definition
to the place where comments indicate.

Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
---
 kernel/rcu/tree.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 43991a40b084..ed9b534ad870 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -301,6 +301,8 @@ struct rcu_state {
 	u8	boost ____cacheline_internodealigned_in_smp;
 						/* Subject to priority boost. */
 	unsigned long gp_seq;			/* Grace-period sequence #. */
+	unsigned long gp_max;			/* Maximum GP duration in */
+						/*  jiffies. */
 	struct task_struct *gp_kthread;		/* Task for grace periods. */
 	struct swait_queue_head gp_wq;		/* Where GP task waits. */
 	short gp_flags;				/* Commands for GP task. */
@@ -346,8 +348,6 @@ struct rcu_state {
 						/*  a reluctant CPU. */
 	unsigned long n_force_qs_gpstart;	/* Snapshot of n_force_qs at */
 						/*  GP start. */
-	unsigned long gp_max;			/* Maximum GP duration in */
-						/*  jiffies. */
 	const char *name;			/* Name of structure. */
 	char abbr;				/* Abbreviated name. */
 
-- 
2.20.1 (Apple Git-117)