linux-kernel - [PATCH 2/8] Change the broadcast timer based on rating of clockevent dev

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Message-ID: <20070507202854.GB3926@linux-os.sc.intel.com>
Date:	Mon, 7 May 2007 13:28:54 -0700
From:	Venki Pallipadi <venkatesh.pallipadi@...el.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>, Chris Wright <chrisw@...s-sol.org>
Subject: [PATCH 2/8] Change the broadcast timer based on rating of clockevent dev



Change the broadcast timer, if a timer with higher rating becomes available.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>

Index: linux-2.6.21-tolkml/kernel/time/tick-common.c
===================================================================
--- linux-2.6.21-tolkml.orig/kernel/time/tick-common.c	2007-04-25 20:08:32.000000000 -0700
+++ linux-2.6.21-tolkml/kernel/time/tick-common.c	2007-05-07 09:52:55.000000000 -0700
@@ -200,7 +200,7 @@
 
 	cpu = smp_processor_id();
 	if (!cpu_isset(cpu, newdev->cpumask))
-		goto out;
+		goto out_bc;
 
 	td = &per_cpu(tick_cpu_device, cpu);
 	curdev = td->evtdev;
@@ -265,7 +265,7 @@
 	 */
 	if (tick_check_broadcast_device(newdev))
 		ret = NOTIFY_STOP;
-out:
+
 	spin_unlock_irqrestore(&tick_device_lock, flags);
 
 	return ret;
Index: linux-2.6.21-tolkml/kernel/time/tick-broadcast.c
===================================================================
--- linux-2.6.21-tolkml.orig/kernel/time/tick-broadcast.c	2007-04-25 20:08:32.000000000 -0700
+++ linux-2.6.21-tolkml/kernel/time/tick-broadcast.c	2007-05-07 09:54:32.000000000 -0700
@@ -58,8 +58,9 @@
  */
 int tick_check_broadcast_device(struct clock_event_device *dev)
 {
-	if (tick_broadcast_device.evtdev ||
-	    (dev->features & CLOCK_EVT_FEAT_C3STOP))
+	if ((tick_broadcast_device.evtdev &&
+	     tick_broadcast_device.evtdev->rating >= dev->rating) ||
+	     (dev->features & CLOCK_EVT_FEAT_C3STOP))
 		return 0;
 
 	clockevents_exchange_device(NULL, dev);
@@ -483,11 +484,9 @@
  */
 void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
 {
-	if (bc->mode != CLOCK_EVT_MODE_ONESHOT) {
-		bc->event_handler = tick_handle_oneshot_broadcast;
-		clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
-		bc->next_event.tv64 = KTIME_MAX;
-	}
+	bc->event_handler = tick_handle_oneshot_broadcast;
+	clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
+	bc->next_event.tv64 = KTIME_MAX;
 }
 
 /*
-
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