linux-kernel - [tip: core/rcu] rcu: gp_max is protected by root rcu

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Message-ID: <159618740851.4006.12238943856453230041.tip-bot2@tip-bot2>
Date:   Fri, 31 Jul 2020 09:23:28 -0000
From:   "tip-bot2 for Wei Yang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Wei Yang <richard.weiyang@...ux.alibaba.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/rcu] rcu: gp_max is protected by root rcu_node's lock

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

Commit-ID:     00943a609d7ad0f08e58bc9c214f38b0ba163c88
Gitweb:        https://git.kernel.org/tip/00943a609d7ad0f08e58bc9c214f38b0ba163c88
Author:        Wei Yang <richard.weiyang@...ux.alibaba.com>
AuthorDate:    Fri, 12 Jun 2020 10:07:52 +08:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Mon, 29 Jun 2020 11:58:51 -07:00

rcu: gp_max is protected by root rcu_node's lock

Because gp_max is protected by root rcu_node's lock, this commit moves
the gp_max definition to the region of the rcu_node structure containing
fields protected by this lock.

Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 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 575745f..09ec93b 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -302,6 +302,8 @@ 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. */
@@ -347,8 +349,6 @@ 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. */