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| author | Frederic Weisbecker <frederic@kernel.org> | 2023-10-04 01:29:02 +0200 |
|---|---|---|
| committer | Neeraj Upadhyay (AMD) <neeraj.iitr10@gmail.com> | 2023-12-12 02:41:16 +0530 |
| commit | 94c55b9e21979daa88e190bf971c47432a818ebe (patch) | |
| tree | d017cdf353a7bcf9caa2b5b4b02ae5b3dafd48c4 | |
| parent | 20eb4142397cf3ec221de43f10ea149af462c572 (diff) | |
| download | linux-stable-94c55b9e21979daa88e190bf971c47432a818ebe.tar.gz linux-stable-94c55b9e21979daa88e190bf971c47432a818ebe.tar.bz2 linux-stable-94c55b9e21979daa88e190bf971c47432a818ebe.zip | |
srcu: No need to advance/accelerate if no callback enqueued
While in grace period start, there is nothing to accelerate and
therefore no need to advance the callbacks either if no callback is
to be enqueued.
Spare these needless operations in this case.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.iitr10@gmail.com>
| -rw-r--r-- | kernel/rcu/srcutree.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index e9356a103626..2bfc8ed1eed2 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -1261,9 +1261,11 @@ static unsigned long srcu_gp_start_if_needed(struct srcu_struct *ssp, * period (gp_num = X + 8). So acceleration fails. */ s = rcu_seq_snap(&ssp->srcu_sup->srcu_gp_seq); - rcu_segcblist_advance(&sdp->srcu_cblist, - rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq)); - WARN_ON_ONCE(!rcu_segcblist_accelerate(&sdp->srcu_cblist, s) && rhp); + if (rhp) { + rcu_segcblist_advance(&sdp->srcu_cblist, + rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq)); + WARN_ON_ONCE(!rcu_segcblist_accelerate(&sdp->srcu_cblist, s)); + } if (ULONG_CMP_LT(sdp->srcu_gp_seq_needed, s)) { sdp->srcu_gp_seq_needed = s; needgp = true; |