linux-kernel - [PATCH] x86_64: move out tick_nohz_stop_sched

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Date:	Wed, 09 Jan 2008 19:44:06 -0800
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	mingo@...e.hu
Cc:	tglx@...utronix.de, hpa@...or.com, chrisw@...s-sol.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86_64: move out tick_nohz_stop_sched_tick() call from the
 loop

Hello,

tick_nohz_stop_sched_tick() and tick_nohz_restart_sched_tick()
pair in cpu_idle() is different from 32-bit version.

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
Subject: [PATCH] x86_64: move out tick_nohz_stop_sched_tick() call from the loop

Move out tick_nohz_stop_sched_tick() call from the loop in cpu_idle
same as 32-bit version.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
 arch/x86/kernel/process_64.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 93ce4f3..6870208 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -170,14 +170,13 @@ void cpu_idle(void)
 	current_thread_info()->status |= TS_POLLING;
 	/* endless idle loop with no priority at all */
 	while (1) {
+		tick_nohz_stop_sched_tick();
 		while (!need_resched()) {
 			void (*idle)(void);
 
 			if (__get_cpu_var(cpu_idle_state))
 				__get_cpu_var(cpu_idle_state) = 0;
 
-			tick_nohz_stop_sched_tick();
-
 			rmb();
 			idle = pm_idle;
 			if (!idle)
-- 
1.5.3.6


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