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rcu: Switch callers from rcu_process_gp_end() to note_gp_changes() 

Because note_gp_changes() now incorporates rcu_process_gp_end() function,
this commit switches to the former and eliminates the latter.  In
addition, this commit changes external calls from __rcu_process_gp_end()
to __note_gp_changes().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2013-03-19 11:32:11 -07:00
parent d34ea3221a
commit 470716fc04
2 changed files with 4 additions and 29 deletions
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31
kernel/rcutree.c
View File

@ -1343,28 +1343,6 @@ static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp)
raw_spin_unlock_irqrestore(&rnp->lock, flags);
}
/*
* Advance this CPU's callbacks, but only if the current grace period
* has ended. This may be called only from the CPU to whom the rdp
* belongs.
*/
static void
rcu_process_gp_end(struct rcu_state *rsp, struct rcu_data *rdp)
{
unsigned long flags;
struct rcu_node *rnp;
local_irq_save(flags);
rnp = rdp->mynode;
if (rdp->completed == ACCESS_ONCE(rnp->completed) || /* outside lock. */
!raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */
local_irq_restore(flags);
return;
}
__rcu_process_gp_end(rsp, rnp, rdp);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
}
/*
* Did someone else start a new RCU grace period start since we last
* checked? Update local state appropriately if so. Must be called
@ -1393,9 +1371,6 @@ check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
static void
rcu_start_gp_per_cpu(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp)
{
/* Prior grace period ended, so advance callbacks for current CPU. */
__rcu_process_gp_end(rsp, rnp, rdp);
/* Set state so that this CPU will detect the next quiescent state. */
__note_gp_changes(rsp, rnp, rdp);
}
@ -1531,7 +1506,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
ACCESS_ONCE(rnp->completed) = rsp->gpnum;
rdp = this_cpu_ptr(rsp->rda);
if (rnp == rdp->mynode)
__rcu_process_gp_end(rsp, rnp, rdp);
__note_gp_changes(rsp, rnp, rdp);
nocb += rcu_future_gp_cleanup(rsp, rnp);
raw_spin_unlock_irq(&rnp->lock);
cond_resched();
@ -2276,7 +2251,7 @@ __rcu_process_callbacks(struct rcu_state *rsp)
WARN_ON_ONCE(rdp->beenonline == 0);
/* Handle the end of a grace period that some other CPU ended. */
rcu_process_gp_end(rsp, rdp);
note_gp_changes(rsp, rdp);
/* Update RCU state based on any recent quiescent states. */
rcu_check_quiescent_state(rsp, rdp);
@ -2362,7 +2337,7 @@ static void __call_rcu_core(struct rcu_state *rsp, struct rcu_data *rdp,
if (unlikely(rdp->qlen > rdp->qlen_last_fqs_check + qhimark)) {
/* Are we ignoring a completed grace period? */
rcu_process_gp_end(rsp, rdp);
note_gp_changes(rsp, rdp);
check_for_new_grace_period(rsp, rdp);
/* Start a new grace period if one not already started. */

2
kernel/rcutree_plugin.h
View File

@ -1628,7 +1628,7 @@ static bool rcu_try_advance_all_cbs(void)
*/
if (rdp->completed != rnp->completed &&
rdp->nxttail[RCU_DONE_TAIL] != rdp->nxttail[RCU_NEXT_TAIL])
rcu_process_gp_end(rsp, rdp);
note_gp_changes(rsp, rdp);
if (cpu_has_callbacks_ready_to_invoke(rdp))
cbs_ready = true;