rcu: Mark callbacks not currently participating in barrier operation

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RCU keeps a count of the number of callbacks that the current
rcu_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
RCU-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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Paul E. McKenney 2024-08-01 17:43:01 -07:00 • committed by Neeraj Upadhyay

parent 48c21c020f

commit 0616f7e981

1 changed files with 3 additions and 0 deletions

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kernel/rcu/tree.c

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