rcu: grpnum just records group number

The ->grpnum field in the rcu_node structure contains the bit position
in this structure's parent's bitmasks, which is not the CPU number.
This commit therefore adjusts this field's comment accordingly.

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 9f903f5c9fa1b8f0a1489c2aa1c0f4e8769979f6..c96ae351688b9cff62775c55043fec7c1590b01c 100644 (file)
--- 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 */