linux-kernel - [PATCH 2/4] rcu: grplo/grphi just records CPU number

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Date:   Fri, 12 Jun 2020 10:07:53 +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 2/4] rcu: grplo/grphi just records CPU number

We store lowest and highest CPU number belongs to a rcu_node, which is
not the group number.

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 ed9b534ad870..ce9ab7371706 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -73,8 +73,8 @@ struct rcu_node {
 	unsigned long ffmask;	/* Fully functional CPUs. */
 	unsigned long grpmask;	/* Mask to apply to parent qsmask. */
 				/*  Only one bit will be set in this mask. */
-	int	grplo;		/* lowest-numbered CPU or group here. */
-	int	grphi;		/* highest-numbered CPU or group here. */
+	int	grplo;		/* lowest-numbered CPU here. */
+	int	grphi;		/* highest-numbered CPU here. */
 	u8	grpnum;		/* CPU/group number for next level up. */
 	u8	level;		/* root is at level 0. */
 	bool	wait_blkd_tasks;/* Necessary to wait for blocked tasks to */
-- 
2.20.1 (Apple Git-117)