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rcu/kfree: Warn on unexpected tail state

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Within the rcu_sr_normal_gp_cleanup_work() function, there is an acquire
load from rcu_state.srs_done_tail, which is expected to be non-NULL.
This commit adds a WARN_ON_ONCE() to check this expectation.

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 2024-06-18 10:40:30 -07:00 committed by Neeraj Upadhyay
parent 8400291e28
commit 3471e96bcf
1 changed files with 1 additions and 1 deletions
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kernel/rcu/tree.c
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@ -1649,7 +1649,7 @@ static void rcu_sr_normal_gp_cleanup_work(struct work_struct *work)
* the done tail list manipulations are protected here.
*/
done = smp_load_acquire(&rcu_state.srs_done_tail);
if (!done)
if (WARN_ON_ONCE(!done))
return;
WARN_ON_ONCE(!rcu_sr_is_wait_head(done));