[patch 04/34] idle: Provide a generic entry point for the idle code

[Thomas Gleixner]

For now this calls cpu_idle(), but in the long run we want to move the
cpu bringup code to the core and therefor we add a state argument.

Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
 include/linux/cpu.h |    8 ++++++++
 init/main.c         |    2 +-
 kernel/Makefile     |    1 +
 kernel/cpu/Makefile |    1 +
 kernel/cpu/idle.c   |   10 ++++++++++
 5 files changed, 21 insertions(+), 1 deletion(-)

Index: linux-2.6/include/linux/cpu.h
===================================================================
--- linux-2.6.orig/include/linux/cpu.h
+++ linux-2.6/include/linux/cpu.h
@@ -212,4 +212,12 @@ static inline int disable_nonboot_cpus(v
 static inline void enable_nonboot_cpus(void) {}
 #endif /* !CONFIG_PM_SLEEP_SMP */
 
+enum cpuhp_state {
+       CPUHP_OFFLINE,
+       CPUHP_ONLINE,
+};
+
+void cpu_startup_entry(enum cpuhp_state state);
+void cpu_idle(void);
+
 #endif /* _LINUX_CPU_H_ */
Index: linux-2.6/init/main.c
===================================================================
--- linux-2.6.orig/init/main.c
+++ linux-2.6/init/main.c
@@ -384,7 +384,7 @@ static noinline void __init_refok rest_i
        init_idle_bootup_task(current);
        schedule_preempt_disabled();
        /* Call into cpu_idle with preempt disabled */
-       cpu_idle();
+       cpu_startup_entry(CPUHP_ONLINE);
 }
 
 /* Check for early params. */
Index: linux-2.6/kernel/Makefile
===================================================================
--- linux-2.6.orig/kernel/Makefile
+++ linux-2.6/kernel/Makefile
@@ -24,6 +24,7 @@ endif
 
 obj-y += sched/
 obj-y += power/
+obj-y += cpu/
 
 obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
 obj-$(CONFIG_FREEZER) += freezer.o
Index: linux-2.6/kernel/cpu/Makefile
===================================================================
--- /dev/null
+++ linux-2.6/kernel/cpu/Makefile
@@ -0,0 +1 @@
+obj-y  = idle.o
Index: linux-2.6/kernel/cpu/idle.c
===================================================================
--- /dev/null
+++ linux-2.6/kernel/cpu/idle.c
@@ -0,0 +1,10 @@
+/*
+ * Generic entry point for the idle threads
+ */
+#include <linux/sched.h>
+#include <linux/cpu.h>
+
+void cpu_startup_entry(enum cpuhp_state state)
+{
+       cpu_idle();
+}


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