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srcutree: Add lockdep and early-boot checks to synchronize_srcu_atomic()

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Add the lockdep annotation, same-type SRCU nesting warning, and
early-boot check used by __synchronize_srcu().

Suggested-by: Zqiang <qiang.zhang@linux.dev>
Signed-off-by: Kunwu Chan <kunwu.chan@gmail.com>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Kunwu Chan 2026-09-11 17:35:15 +08:00 committed by Paul E. McKenney
parent 0150a00d82
commit 91d2ab160c
1 changed files with 8 additions and 0 deletions
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8
kernel/rcu/srcutree.c
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@ -2122,6 +2122,14 @@ void synchronize_srcu_atomic(struct srcu_struct *ssp)
unsigned long rdm0, rdm1;
unsigned long unlocks0, unlocks1;
srcu_lock_sync(&ssp->dep_map);
RCU_LOCKDEP_WARN(lockdep_is_held(ssp),
"Illegal synchronize_srcu_atomic() in same-type SRCU read-side critical section");
if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE)
return;
// Initialize. Either init_srcu_struct() was invoked or
// DEFINE_SRCU() or similar was used. Therefore, no allocation
// will be done here.