linux-kernel - [PATCH 3/4] rcu: grpnum just records group number

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Date:   Fri, 12 Jun 2020 10:07:54 +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 3/4] rcu: grpnum just records group number

grpnum in rcu_node means the position in its parent, which is not the
CPU number even in last level.

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

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index ce9ab7371706..512829eed545 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -75,7 +75,7 @@ struct rcu_node {
 				/*  Only one bit will be set in this mask. */
 	int	grplo;		/* lowest-numbered CPU here. */
 	int	grphi;		/* highest-numbered CPU here. */
-	u8	grpnum;		/* CPU/group number for next level up. */
+	u8	grpnum;		/* group number for next level up. */
 	u8	level;		/* root is at level 0. */
 	bool	wait_blkd_tasks;/* Necessary to wait for blocked tasks to */
 				/*  exit RCU read-side critical sections */
-- 
2.20.1 (Apple Git-117)