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>
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@ -1261,9 +1261,11 @@ static unsigned long srcu_gp_start_if_needed(struct srcu_struct *ssp,
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* period (gp_num = X + 8). So acceleration fails.
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*/
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s = rcu_seq_snap(&ssp->srcu_sup->srcu_gp_seq);
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rcu_segcblist_advance(&sdp->srcu_cblist,
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rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq));
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WARN_ON_ONCE(!rcu_segcblist_accelerate(&sdp->srcu_cblist, s) && rhp);
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if (rhp) {
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rcu_segcblist_advance(&sdp->srcu_cblist,
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rcu_seq_current(&ssp->srcu_sup->srcu_gp_seq));
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WARN_ON_ONCE(!rcu_segcblist_accelerate(&sdp->srcu_cblist, s));
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}
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if (ULONG_CMP_LT(sdp->srcu_gp_seq_needed, s)) {
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sdp->srcu_gp_seq_needed = s;
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needgp = true;
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