Commit b92db6cb authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Paul E. McKenney

rcu: Rearrange locking in rcu_start_gp()

If CPUs are to give prior notice of needed grace periods, it will be
necessary to invoke rcu_start_gp() without dropping the root rcu_node
structure's ->lock.  This commit takes a first step in this direction
by moving the release of this lock to the end of rcu_start_gp().
Signed-off-by: default avatarPaul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent c0f4dfd4
......@@ -1521,16 +1521,14 @@ rcu_start_gp(struct rcu_state *rsp, unsigned long flags)
raw_spin_unlock_irqrestore(&rnp->lock, flags);
return;
}
rsp->gp_flags = RCU_GP_FLAG_INIT;
raw_spin_unlock(&rnp->lock); /* Interrupts remain disabled. */
/* Ensure that CPU is aware of completion of last grace period. */
rcu_process_gp_end(rsp, rdp);
local_irq_restore(flags);
__rcu_process_gp_end(rsp, rdp->mynode, rdp);
/* Wake up rcu_gp_kthread() to start the grace period. */
wake_up(&rsp->gp_wq);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
}
/*
......
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