On 11 September 2026 17:09:13 BST, Kunwu Chan <[email protected]> wrote: >Add the RCU_LOCKDEP_WARN and early-boot check that the Tree version >gained, srcu_lock_sync() was already present. > >Suggested-by: Zqiang <[email protected]>
Ok. Reviewed-by: Bradley Morgan <[email protected]> >Signed-off-by: Kunwu Chan <[email protected]> >--- > kernel/rcu/srcutiny.c | 6 ++++++ > 1 file changed, 6 insertions(+) > >diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c >index 99f8bfd98b04..76411562366f 100644 >--- a/kernel/rcu/srcutiny.c >+++ b/kernel/rcu/srcutiny.c >@@ -361,6 +361,12 @@ void synchronize_srcu_atomic(struct srcu_struct *ssp) > > 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; >+ Wow! > if (IS_ENABLED(CONFIG_PREEMPTION)) > synchronize_rcu(); // Needed for RCU Tasks Trace to imply RCU > grace period. > // And in Tiny RCU, it is near zero cost and > doesn't block. > --- Thanks! https://lore.kernel.org/all/[email protected]/
