linux-kernel - [v5 RFC PATCH 6/7]: POWER: add a default

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Message-ID: <20090922054024.GG6417@linux.vnet.ibm.com>
Date:	Tue, 22 Sep 2009 11:10:24 +0530
From:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
To:	Joel Schopp <jschopp@...tin.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Arun Bharadwaj <arun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [v5 RFC PATCH 6/7]: POWER: add a default_idle idle loop for POWER.

* Arun R Bharadwaj <arun@...ux.vnet.ibm.com> [2009-09-22 11:03:14]:

In arch/powerpc/kernel/idle.c create a default_idle() routine by moving
the failover condition of the cpu_idle() idle loop. This is needed by
cpuidle infrastructure to call default_idle when other idle routines
are not yet registered. Functionality remains the same, but the code is
slightly moved around.


Signed-off-by: Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
---
 arch/powerpc/Kconfig              |    3 +++
 arch/powerpc/include/asm/system.h |    1 +
 arch/powerpc/kernel/idle.c        |    6 ++++++
 3 files changed, 10 insertions(+)

Index: linux.trees.git/arch/powerpc/Kconfig
===================================================================
--- linux.trees.git.orig/arch/powerpc/Kconfig
+++ linux.trees.git/arch/powerpc/Kconfig
@@ -88,6 +88,9 @@ config ARCH_HAS_ILOG2_U64
 	bool
 	default y if 64BIT
 
+config ARCH_HAS_DEFAULT_IDLE
+	def_bool y
+
 config GENERIC_HWEIGHT
 	bool
 	default y
Index: linux.trees.git/arch/powerpc/include/asm/system.h
===================================================================
--- linux.trees.git.orig/arch/powerpc/include/asm/system.h
+++ linux.trees.git/arch/powerpc/include/asm/system.h
@@ -218,6 +218,7 @@ extern unsigned long klimit;
 extern void *alloc_maybe_bootmem(size_t size, gfp_t mask);
 extern void *zalloc_maybe_bootmem(size_t size, gfp_t mask);
 
+extern void default_idle(void);
 extern int powersave_nap;	/* set if nap mode can be used in idle loop */
 
 /*
Index: linux.trees.git/arch/powerpc/kernel/idle.c
===================================================================
--- linux.trees.git.orig/arch/powerpc/kernel/idle.c
+++ linux.trees.git/arch/powerpc/kernel/idle.c
@@ -94,6 +94,12 @@ void cpu_idle(void)
 	}
 }
 
+void default_idle(void)
+{
+	HMT_low();
+	HMT_very_low();
+}
+
 int powersave_nap;
 
 #ifdef CONFIG_SYSCTL
--
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