linux-kernel - [tip:core/rcu] rcu: Eliminate second argument of rcu_process

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Date:	Wed, 13 Jan 2010 10:26:09 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/rcu] rcu: Eliminate second argument of rcu_process_dyntick()

Commit-ID:  eb1ba45f1e7f6e626fefc063b340c7cbec9bd8c7
Gitweb:     http://git.kernel.org/tip/eb1ba45f1e7f6e626fefc063b340c7cbec9bd8c7
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Mon, 4 Jan 2010 15:09:05 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 13 Jan 2010 09:06:03 +0100

rcu: Eliminate second argument of rcu_process_dyntick()

At this point, the second argument to all calls to
rcu_process_dyntick() is a function of the same field of the
structure passed in as the first argument, namely, rsp->gpnum-1.
 So propagate rsp->gpnum-1 to all uses of the second argument
within rcu_process_dyntick() and then eliminate the second
argument.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: Valdis.Kletnieks@...edu
Cc: dhowells@...hat.com
LKML-Reference: <12626465503786-git-send-email->
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/rcutree.c |   11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 62b6433..c7d0070 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1147,7 +1147,7 @@ void rcu_check_callbacks(int cpu, int user)
  * Returns 1 if the current grace period ends while scanning (possibly
  * because we made it end).
  */
-static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
+static int rcu_process_dyntick(struct rcu_state *rsp,
 			       int (*f)(struct rcu_data *))
 {
 	unsigned long bit;
@@ -1159,7 +1159,7 @@ static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
 	rcu_for_each_leaf_node(rsp, rnp) {
 		mask = 0;
 		spin_lock_irqsave(&rnp->lock, flags);
-		if (rnp->completed != lastcomp) {
+		if (rnp->completed != rsp->gpnum - 1) {
 			spin_unlock_irqrestore(&rnp->lock, flags);
 			return 1;
 		}
@@ -1173,7 +1173,7 @@ static int rcu_process_dyntick(struct rcu_state *rsp, long lastcomp,
 			if ((rnp->qsmask & bit) != 0 && f(rsp->rda[cpu]))
 				mask |= bit;
 		}
-		if (mask != 0 && rnp->completed == lastcomp) {
+		if (mask != 0 && rnp->completed == rsp->gpnum - 1) {
 
 			/* rcu_report_qs_rnp() releases rnp->lock. */
 			rcu_report_qs_rnp(mask, rsp, rnp, flags);
@@ -1226,7 +1226,7 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 			break; /* So gcc recognizes the dead code. */
 
 		/* Record dyntick-idle state. */
-		gpdone = rcu_process_dyntick(rsp, rsp->gpnum - 1,
+		gpdone = rcu_process_dyntick(rsp,
 					     dyntick_save_progress_counter);
 		spin_lock(&rnp->lock);  /* irqs already disabled */
 		if (gpdone)
@@ -1249,8 +1249,7 @@ static void force_quiescent_state(struct rcu_state *rsp, int relaxed)
 
 		/* Check dyntick-idle state, send IPI to laggarts. */
 		spin_unlock(&rnp->lock);  /* irqs remain disabled */
-		gpdone = rcu_process_dyntick(rsp, rsp->gpnum - 1,
-					     rcu_implicit_dynticks_qs);
+		gpdone = rcu_process_dyntick(rsp, rcu_implicit_dynticks_qs);
 
 		/* Leave state in case more forcing is required. */
 
--
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