Before SRCU_SIZE_WAIT_CALL srcu_size_state is reached, the srcu
callback only insert to boot-CPU srcu_data structure's->srcu_cblist
and other CPU srcu_data structure's->srcu_cblist is always empty. so
before SRCU_SIZE_WAIT_CALL is reached, need to correctly check boot-CPU
pend cbs in srcu_might_be_idle().
Signed-off-by: Zqiang <qiang1.zhang@xxxxxxxxx>
---
kernel/rcu/srcutree.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 6af031200580..6d9af9901765 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -1098,8 +1098,11 @@ static bool srcu_might_be_idle(struct srcu_struct *ssp)
unsigned long tlast;
check_init_srcu_struct(ssp);
- /* If the local srcu_data structure has callbacks, not idle. */
- sdp = raw_cpu_ptr(ssp->sda);
+ /* If the boot CPU or local srcu_data structure has callbacks, not idle. */
+ if (smp_load_acquire(&ssp->srcu_size_state) < SRCU_SIZE_WAIT_CALL)
+ sdp = per_cpu_ptr(ssp->sda, get_boot_cpu_id());
+ else
+ sdp = raw_cpu_ptr(ssp->sda);
spin_lock_irqsave_rcu_node(sdp, flags);
if (rcu_segcblist_pend_cbs(&sdp->srcu_cblist)) {
spin_unlock_irqrestore_rcu_node(sdp, flags);
--
2.25.1
