rcu: grplo/grphi just records CPU number

The ->grplo and ->grphi fields store the lowest and highest CPU number
covered by to a rcu_node structure, which is not the group number.
This commit therefore adjusts these fields' comments to match reality.

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 09ec93b..9f903f5 100644 (file)
--- 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 */