diff options
| author | Paul E. McKenney <[email protected]> | 2024-08-01 17:36:22 -0700 |
|---|---|---|
| committer | Neeraj Upadhyay <[email protected]> | 2024-08-12 23:51:35 +0530 |
| commit | e53cef031bfac2369d249cfd726706c30a5a3351 (patch) | |
| tree | 87f0898be80a0d53adc7b5b9eb1b9f81d31206cb | |
| parent | c8c3ae83e0bbed6d56a00068c7d10ebf64db48d9 (diff) | |
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" <[email protected]>
Signed-off-by: Neeraj Upadhyay <[email protected]>
| -rw-r--r-- | kernel/rcu/srcutree.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index aaee09a6748c..31706e3293bc 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -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)) |