linux-kernel - [tip:smp/hotplug] h8300: Use generic idle loop

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Message-ID: <tip-0d24260c9e27fc1de20c72669bcc387767a1c170@git.kernel.org>
Date:	Mon, 8 Apr 2013 13:26:06 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	rusty@...tcorp.com.au, torvalds@...ux-foundation.org,
	peterz@...radead.org, srivatsa.bhat@...ux.vnet.ibm.com,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	ysato@...rs.sourceforge.jp, magnus.damm@...il.com
Subject: [tip:smp/hotplug] h8300: Use generic idle loop

Commit-ID:  0d24260c9e27fc1de20c72669bcc387767a1c170
Gitweb:     http://git.kernel.org/tip/0d24260c9e27fc1de20c72669bcc387767a1c170
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Thu, 21 Mar 2013 22:49:45 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 8 Apr 2013 17:39:25 +0200

h8300: Use generic idle loop

Use the core idle poll function instead of the private one

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Reviewed-by: Cc: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Cc: Magnus Damm <magnus.damm@...il.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Link: http://lkml.kernel.org/r/20130321215234.277153345@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/h8300/Kconfig          |  1 +
 arch/h8300/kernel/process.c | 35 ++++-------------------------------
 2 files changed, 5 insertions(+), 31 deletions(-)

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 79250de..5374975 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -8,6 +8,7 @@ config H8300
 	select VIRT_TO_BUS
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select GENERIC_IRQ_SHOW
+	select GENERIC_IDLE_LOOP
 	select GENERIC_CPU_DEVICES
 	select MODULES_USE_ELF_RELA
 	select OLD_SIGSUSPEND3
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
index b609f63..a17d2cd 100644
--- a/arch/h8300/kernel/process.c
+++ b/arch/h8300/kernel/process.c
@@ -53,40 +53,13 @@ asmlinkage void ret_from_kernel_thread(void);
  * The idle loop on an H8/300..
  */
 #if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
-static void default_idle(void)
+void arch_cpu_idle(void)
 {
-	local_irq_disable();
-	if (!need_resched()) {
-		local_irq_enable();
-		/* XXX: race here! What if need_resched() gets set now? */
-		__asm__("sleep");
-	} else
-		local_irq_enable();
-}
-#else
-static void default_idle(void)
-{
-	cpu_relax();
+	local_irq_enable();
+	/* XXX: race here! What if need_resched() gets set now? */
+	__asm__("sleep");
 }
 #endif
-void (*idle)(void) = default_idle;
-
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle(void)
-{
-	while (1) {
-		rcu_idle_enter();
-		while (!need_resched())
-			idle();
-		rcu_idle_exit();
-		schedule_preempt_disabled();
-	}
-}
 
 void machine_restart(char * __unused)
 {
--
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