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rcu: grpnum just records group number

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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>
This commit is contained in:
Wei Yang 2020-06-12 10:07:54 +08:00 committed by Paul E. McKenney
parent a2dae43088
commit 7a0c2b0940
1 changed files with 1 additions and 1 deletions
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kernel/rcu/tree.h
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@ -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 */