linux-kernel - [tip:smp/hotplug] sh: Remove cpu_idle

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Date:	Tue, 8 May 2012 05:31:07 -0700
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, lethal@...ux-sh.org, tglx@...utronix.de
Subject: [tip:smp/hotplug] sh: Remove cpu_idle_wait()

Commit-ID:  86627c93b35082f7a0e4d3111546943984b932c7
Gitweb:     http://git.kernel.org/tip/86627c93b35082f7a0e4d3111546943984b932c7
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 7 May 2012 17:59:51 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 8 May 2012 12:35:07 +0200

sh: Remove cpu_idle_wait()

cpuidle uses generic kick_all_cpus_sync() now. Remove the unused code.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Paul Mundt <lethal@...ux-sh.org>
Link: http://lkml.kernel.org/r/20120507175652.461648208@linutronix.de
---
 arch/sh/Kconfig                 |    3 ---
 arch/sh/include/asm/processor.h |    1 -
 arch/sh/kernel/idle.c           |   20 --------------------
 3 files changed, 0 insertions(+), 24 deletions(-)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 244cfd0..04a8cb4 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -153,9 +153,6 @@ config ARCH_NO_VIRT_TO_BUS
 config ARCH_HAS_DEFAULT_IDLE
 	def_bool y
 
-config ARCH_HAS_CPU_IDLE_WAIT
-	def_bool y
-
 config NO_IOPORT
 	def_bool !PCI
 	depends on !SH_CAYMAN && !SH_SH4202_MICRODEV && !SH_SHMIN
diff --git a/arch/sh/include/asm/processor.h b/arch/sh/include/asm/processor.h
index 6d87912..6dbc1be 100644
--- a/arch/sh/include/asm/processor.h
+++ b/arch/sh/include/asm/processor.h
@@ -98,7 +98,6 @@ extern struct sh_cpuinfo cpu_data[];
 #define cpu_relax()	barrier()
 
 void default_idle(void);
-void cpu_idle_wait(void);
 void stop_this_cpu(void *);
 
 /* Forward decl */
diff --git a/arch/sh/kernel/idle.c b/arch/sh/kernel/idle.c
index ee226e2..0c91016 100644
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -132,10 +132,6 @@ void __init select_idle_routine(void)
 		pm_idle = poll_idle;
 }
 
-static void do_nothing(void *unused)
-{
-}
-
 void stop_this_cpu(void *unused)
 {
 	local_irq_disable();
@@ -144,19 +140,3 @@ void stop_this_cpu(void *unused)
 	for (;;)
 		cpu_sleep();
 }
-
-/*
- * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
- * pm_idle and update to new pm_idle value. Required while changing pm_idle
- * handler on SMP systems.
- *
- * Caller must have changed pm_idle to the new value before the call. Old
- * pm_idle value will not be used by any CPU after the return of this function.
- */
-void cpu_idle_wait(void)
-{
-	smp_mb();
-	/* kick all the CPUs so that they exit out of pm_idle */
-	smp_call_function(do_nothing, NULL, 1);
-}
-EXPORT_SYMBOL_GPL(cpu_idle_wait);
--
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