rcu: Drop early GP request check from rcu_gp_kthread()

Now that grace-period requests use funnel locking and now that they
set ->gp_flags to RCU_GP_FLAG_INIT even when the RCU grace-period
kthread has not yet started, rcu_gp_kthread() no longer needs to check
need_any_future_gp() at startup time.  This commit therefore removes
this check.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 020a0fe2dbeefea54a2ecc25dd10f96725c1f855..ed238886e6cab995b88f166ee4ebf8d372e903fe 100644 (file)
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2135,12 +2135,6 @@ static int __noreturn rcu_gp_kthread(void *arg)
        struct rcu_state *rsp = arg;
        struct rcu_node *rnp = rcu_get_root(rsp);
 
-       /* Check for early-boot work. */
-       raw_spin_lock_irq_rcu_node(rnp);
-       if (need_any_future_gp(rnp))
-               WRITE_ONCE(rsp->gp_flags, RCU_GP_FLAG_INIT);
-       raw_spin_unlock_irq_rcu_node(rnp);
-
        rcu_bind_gp_kthread();
        for (;;) {