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srcu: Mark callbacks not currently participating in barrier operation
SRCU keeps a count of the number of callbacks that the current srcu_barrier() is waiting on, but there is currently no easy way to work out which callback is stuck. One way to do this is to mark idle SRCU-barrier callbacks by making the ->next pointer point to the callback itself, and this commit does just that. Later commits will use this for debug output. Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
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@ -137,6 +137,7 @@ static void init_srcu_struct_data(struct srcu_struct *ssp)
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sdp->srcu_cblist_invoking = false;
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sdp->srcu_gp_seq_needed = ssp->srcu_sup->srcu_gp_seq;
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sdp->srcu_gp_seq_needed_exp = ssp->srcu_sup->srcu_gp_seq;
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sdp->srcu_barrier_head.next = &sdp->srcu_barrier_head;
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sdp->mynode = NULL;
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sdp->cpu = cpu;
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INIT_WORK(&sdp->work, srcu_invoke_callbacks);
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@ -1562,6 +1563,7 @@ static void srcu_barrier_cb(struct rcu_head *rhp)
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struct srcu_data *sdp;
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struct srcu_struct *ssp;
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rhp->next = rhp; // Mark the callback as having been invoked.
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sdp = container_of(rhp, struct srcu_data, srcu_barrier_head);
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ssp = sdp->ssp;
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if (atomic_dec_and_test(&ssp->srcu_sup->srcu_barrier_cpu_cnt))
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