[PATCH tip/core/rcu 22/26] rcu: grpnum just records group number

paulmck
2020-06-23T00:22:22Z

From: Wei Yang <richard.weiyang@linux.alibaba.com>

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@linux.alibaba.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
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 9f903f5..c96ae35 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 */
--
2.9.5