From d434c00fa3ac476ca6295b8310d097dd71984624 Mon Sep 17 00:00:00 2001 From: "Uladzislau Rezki (Sony)" Date: Thu, 15 Apr 2021 19:19:58 +0200 Subject: [PATCH] kvfree_rcu: Add a bulk-list check when a scheduler is run The rcu_scheduler_active flag is set to RCU_SCHEDULER_RUNNING once the scheduler is up and running. That signal is used in order to check and queue a "monitor work" to reclaim freed objects (if there are any) during early boot. This flag is used by kvfree_rcu() to determine when work can safely be queued, at which point memory passed to earlier invocations of kvfree_rcu() can be processed. However, only "krcp->head" is checked for objects that need to be released, and there are now two more, namely, "krcp->bkvhead[0]" and "krcp->bkvhead[1]". Therefore, check these two additional channels. Signed-off-by: Uladzislau Rezki (Sony) Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 676a49ab5b2b4..e86f32d6b8f94 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3739,7 +3739,8 @@ void __init kfree_rcu_scheduler_running(void) struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu); raw_spin_lock_irqsave(&krcp->lock, flags); - if (!krcp->head || krcp->monitor_todo) { + if ((!krcp->bkvhead[0] && !krcp->bkvhead[1] && !krcp->head) || + krcp->monitor_todo) { raw_spin_unlock_irqrestore(&krcp->lock, flags); continue; } -- 2.30.2