From: Kunwu Chan <[email protected]> call_srcu() is forbidden on atomic srcu_struct, so srcu_gp_end() never has callbacks to invoke for them. Yet it schedules callback invocation, which for atomic SRCU's SRCU_SIZE_SMALL state arms the boot CPU's ->delay_work timer every grace period, only for srcu_invoke_callbacks() to find nothing to do.
Skip this for atomic SRCU. Signed-off-by: Kunwu Chan <[email protected]> --- kernel/rcu/srcutree.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c index 2d2a12f86115..c19f59725706 100644 --- a/kernel/rcu/srcutree.c +++ b/kernel/rcu/srcutree.c @@ -1018,10 +1018,10 @@ static void srcu_gp_end(struct srcu_struct *ssp, bool is_atomic) /* Initiate callback invocation as needed. */ ss_state = smp_load_acquire(&sup->srcu_size_state); - if (ss_state < SRCU_SIZE_WAIT_BARRIER) { + if (!is_atomic && ss_state < SRCU_SIZE_WAIT_BARRIER) { srcu_schedule_cbs_sdp(per_cpu_ptr(ssp->sda, get_boot_cpu_id()), cbdelay); - } else { + } else if (!is_atomic) { idx = rcu_seq_ctr(gpseq) % ARRAY_SIZE(snp->srcu_have_cbs); srcu_for_each_node_breadth_first(ssp, snp) { raw_spin_lock_irq_rcu_node(snp); -- 2.43.0
