[PATCH 1/5] ppc64: Make idle_loop a ppc_md function

[Michael Ellerman]

This patch adds an idle member to the ppc_md structure and calls it from
cpu_idle(). If a platform leaves ppc_md.idle as null it will get the
default idle loop default_idle().

Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
---

 arch/ppc64/kernel/idle.c    |    8 +++++---
 arch/ppc64/kernel/setup.c   |    6 +++---
 include/asm-ppc64/machdep.h |    5 +++++
 3 files changed, 13 insertions(+), 6 deletions(-)

Index: ppc64-2.6/include/asm-ppc64/machdep.h
===================================================================
--- ppc64-2.6.orig/include/asm-ppc64/machdep.h
+++ ppc64-2.6/include/asm-ppc64/machdep.h
@@ -140,8 +140,13 @@ struct machdep_calls {
 						unsigned long size,
 						pgprot_t vma_prot);
 
+	/* Idle loop for this platform, leave empty for default idle loop */
+	int		(*idle_loop)(void);
 };
 
+extern int default_idle(void);
+extern int native_idle(void);
+
 extern struct machdep_calls ppc_md;
 extern char cmd_line[COMMAND_LINE_SIZE];
 
Index: ppc64-2.6/arch/ppc64/kernel/setup.c
===================================================================
--- ppc64-2.6.orig/arch/ppc64/kernel/setup.c
+++ ppc64-2.6/arch/ppc64/kernel/setup.c
@@ -96,7 +96,6 @@ extern void udbg_init_maple_realmode(voi
 extern unsigned long klimit;
 
 extern void mm_init_ppc64(void);
-extern int  idle_setup(void);
 extern void stab_initialize(unsigned long stab);
 extern void htab_initialize(void);
 extern void early_init_devtree(void *flat_dt);
@@ -1081,8 +1080,9 @@ void __init setup_arch(char **cmdline_p)
 
 	ppc_md.setup_arch();
 
-	/* Select the correct idle loop for the platform. */
-	idle_setup();
+	/* Use the default idle loop if the platform hasn't provided one. */
+	if (NULL == ppc_md.idle_loop)
+		ppc_md.idle_loop = default_idle;
 
 	paging_init();
 	ppc64_boot_msg(0x15, "Setup Done");
Index: ppc64-2.6/arch/ppc64/kernel/idle.c
===================================================================
--- ppc64-2.6.orig/arch/ppc64/kernel/idle.c
+++ ppc64-2.6/arch/ppc64/kernel/idle.c
@@ -33,6 +33,7 @@
 #include <asm/iSeries/ItLpQueue.h>
 #include <asm/plpar_wrappers.h>
 #include <asm/systemcfg.h>
+#include <asm/machdep.h>
 
 extern void power4_idle(void);
 
@@ -122,7 +123,7 @@ static int iSeries_idle(void)
 
 #else
 
-static int default_idle(void)
+int default_idle(void)
 {
 	long oldval;
 	unsigned int cpu = smp_processor_id();
@@ -288,7 +289,7 @@ static int shared_idle(void)
 
 #endif /* CONFIG_PPC_PSERIES */
 
-static int native_idle(void)
+int native_idle(void)
 {
 	while(1) {
 		/* check CPU type here */
@@ -308,7 +309,8 @@ static int native_idle(void)
 
 void cpu_idle(void)
 {
-	idle_loop();
+	BUG_ON(NULL == ppc_md.idle_loop);
+	ppc_md.idle_loop();
 }
 
 int powersave_nap;