From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com,
tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 06/11] rcu: eliminate second argument of rcu_process_dyntick()
Date: Mon, 4 Jan 2010 15:09:05 -0800 [thread overview]
Message-ID: <12626465503786-git-send-email-> (raw)
In-Reply-To: <20100104230850.GA22111@linux.vnet.ibm.com>
From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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@linux.vnet.ibm.com>
---
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. */
--
1.5.2.5
next prev parent reply other threads:[~2010-01-04 23:10 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-04 23:08 [PATCH tip/core/rcu 0/11] rcu: suppress GP start to simplify force_quiescent_state() Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 01/11] rcu: adjust force_quiescent_state() locking, step 1 Paul E. McKenney
2010-01-13 10:24 ` [tip:core/rcu] rcu: Adjust " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 02/11] rcu: adjust force_quiescent_state() locking, step 2 Paul E. McKenney
2010-01-13 10:25 ` [tip:core/rcu] rcu: Adjust " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 03/11] rcu: prohibit starting new grace periods while forcing quiescent states Paul E. McKenney
2010-01-13 10:25 ` [tip:core/rcu] rcu: Prohibit " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 04/11] rcu: eliminate local variable signaled from force_quiescent_state() Paul E. McKenney
2010-01-13 10:25 ` [tip:core/rcu] rcu: Eliminate " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 05/11] rcu: eliminate local variable lastcomp " Paul E. McKenney
2010-01-13 10:25 ` [tip:core/rcu] rcu: Eliminate " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` Paul E. McKenney [this message]
2010-01-13 10:26 ` [tip:core/rcu] rcu: Eliminate second argument of rcu_process_dyntick() tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 07/11] rcu: eliminate rcu_process_dyntick() return value Paul E. McKenney
2010-01-13 10:26 ` [tip:core/rcu] rcu: Eliminate " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 08/11] rcu: remove leg of force_quiescent_state() switch statement Paul E. McKenney
2010-01-13 10:26 ` [tip:core/rcu] rcu: Remove " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 09/11] rcu: remove redundant grace-period check Paul E. McKenney
2010-01-13 10:26 ` [tip:core/rcu] rcu: Remove " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 10/11] rcu: make force_quiescent_state() start grace period if needed Paul E. McKenney
2010-01-13 10:27 ` [tip:core/rcu] rcu: Make " tip-bot for Paul E. McKenney
2010-01-04 23:09 ` [PATCH tip/core/rcu 11/11] rcu: add force_quiescent_state() testing to rcutorture Paul E. McKenney
2010-01-13 10:27 ` [tip:core/rcu] rcu: Add " tip-bot for Paul E. McKenney
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