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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-02-02 09:10:04 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-04-11 17:28:48 -0700 |
| commit | d22959aa93528c6cf4583560696856cf6bba6b72 (patch) | |
| tree | 683cf33bd238217d5835cde9f77af6dae129f37d /kernel/rcu/rcu_segcblist.c | |
| parent | cfe43f478b79ba45573ca22d52d0d8823be068fa (diff) | |
| download | linux-stable-d22959aa93528c6cf4583560696856cf6bba6b72.tar.gz linux-stable-d22959aa93528c6cf4583560696856cf6bba6b72.tar.bz2 linux-stable-d22959aa93528c6cf4583560696856cf6bba6b72.zip | |
rcu: Clarify fill-the-gap comment in rcu_segcblist_advance()
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>
Diffstat (limited to 'kernel/rcu/rcu_segcblist.c')
| -rw-r--r-- | kernel/rcu/rcu_segcblist.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c index 81145c3ece25..c54ea2b6a36b 100644 --- a/kernel/rcu/rcu_segcblist.c +++ b/kernel/rcu/rcu_segcblist.c @@ -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]) |