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srcu: Mark callbacks not currently participating in barrier operation

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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>
This commit is contained in:
Paul E. McKenney 2024-08-01 17:36:22 -07:00 committed by Neeraj Upadhyay
parent c8c3ae83e0
commit e53cef031b
1 changed files with 2 additions and 0 deletions
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kernel/rcu/srcutree.c
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@ -137,6 +137,7 @@ static void init_srcu_struct_data(struct srcu_struct *ssp)
sdp->srcu_cblist_invoking = false;
sdp->srcu_gp_seq_needed = ssp->srcu_sup->srcu_gp_seq;
sdp->srcu_gp_seq_needed_exp = ssp->srcu_sup->srcu_gp_seq;
sdp->srcu_barrier_head.next = &sdp->srcu_barrier_head;
sdp->mynode = NULL;
sdp->cpu = cpu;
INIT_WORK(&sdp->work, srcu_invoke_callbacks);
@ -1562,6 +1563,7 @@ static void srcu_barrier_cb(struct rcu_head *rhp)
struct srcu_data *sdp;
struct srcu_struct *ssp;
rhp->next = rhp; // Mark the callback as having been invoked.
sdp = container_of(rhp, struct srcu_data, srcu_barrier_head);
ssp = sdp->ssp;
if (atomic_dec_and_test(&ssp->srcu_sup->srcu_barrier_cpu_cnt))