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rcu: Clarify fill-the-gap comment in rcu_segcblist_advance()

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Reported-by: Frederic Weisbecker <frederic@kernel.org>
Reported-by: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Reported-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2022-02-02 09:10:04 -08:00
parent cfe43f478b
commit d22959aa93
1 changed files with 4 additions and 4 deletions
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8
kernel/rcu/rcu_segcblist.c
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@ -505,10 +505,10 @@ void rcu_segcblist_advance(struct rcu_segcblist *rsclp, unsigned long seq)
WRITE_ONCE(rsclp->tails[j], rsclp->tails[RCU_DONE_TAIL]);
/*
* Callbacks moved, so clean up the misordered ->tails[] pointers
* that now point into the middle of the list of ready-to-invoke
* callbacks. The overall effect is to copy down the later pointers
* into the gap that was created by the now-ready segments.
* Callbacks moved, so there might be an empty RCU_WAIT_TAIL
* and a non-empty RCU_NEXT_READY_TAIL. If so, copy the
* RCU_NEXT_READY_TAIL segment to fill the RCU_WAIT_TAIL gap
* created by the now-ready-to-invoke segments.
*/
for (j = RCU_WAIT_TAIL; i < RCU_NEXT_TAIL; i++, j++) {
if (rsclp->tails[j] == rsclp->tails[RCU_NEXT_TAIL])