linux-kernel - [PATCH tip/core/rcu 3/8] rcu: Rename note_new_gpnum() to note_gp

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Date:	Fri, 12 Apr 2013 16:32:32 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, edumazet@...gle.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 3/8] rcu: Rename note_new_gpnum() to note_gp_changes()

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>

Because note_new_gpnum() now also checks for the ends of old grace periods,
this commit changes its name to note_gp_changes().  Later commits will merge
rcu_process_gp_end() into note_gp_changes().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutree.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index a57bac3..dded193 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1297,7 +1297,7 @@ __rcu_process_gp_end(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_dat
  * ->lock of the leaf rcu_node structure corresponding to the current CPU,
  *  and must have irqs disabled.
  */
-static void __note_new_gpnum(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp)
+static void __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp)
 {
 	/* Handle the ends of any preceding grace periods first. */
 	__rcu_process_gp_end(rsp, rnp, rdp);
@@ -1316,19 +1316,20 @@ static void __note_new_gpnum(struct rcu_state *rsp, struct rcu_node *rnp, struct
 	}
 }
 
-static void note_new_gpnum(struct rcu_state *rsp, struct rcu_data *rdp)
+static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp)
 {
 	unsigned long flags;
 	struct rcu_node *rnp;
 
 	local_irq_save(flags);
 	rnp = rdp->mynode;
-	if (rdp->gpnum == ACCESS_ONCE(rnp->gpnum) || /* outside lock. */
+	if ((rdp->gpnum == ACCESS_ONCE(rnp->gpnum) &&
+	     rdp->completed == ACCESS_ONCE(rnp->completed)) || /* w/out lock. */
 	    !raw_spin_trylock(&rnp->lock)) { /* irqs already off, so later. */
 		local_irq_restore(flags);
 		return;
 	}
-	__note_new_gpnum(rsp, rnp, rdp);
+	__note_gp_changes(rsp, rnp, rdp);
 	raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
@@ -1367,7 +1368,7 @@ check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp)
 
 	local_irq_save(flags);
 	if (rdp->gpnum != rsp->gpnum) {
-		note_new_gpnum(rsp, rdp);
+		note_gp_changes(rsp, rdp);
 		ret = 1;
 	}
 	local_irq_restore(flags);
@@ -1386,7 +1387,7 @@ rcu_start_gp_per_cpu(struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_dat
 	__rcu_process_gp_end(rsp, rnp, rdp);
 
 	/* Set state so that this CPU will detect the next quiescent state. */
-	__note_new_gpnum(rsp, rnp, rdp);
+	__note_gp_changes(rsp, rnp, rdp);
 }
 
 /*
-- 
1.8.1.5

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