[RFC PATCH v2 2/3] ARM: SoC: Add per SoC SMP and CPU hotplug operations

Populate the SoC descriptor structure with the SMP and CPU hotplug
operations. To allow the kernel to continue building, the platform
hooks are defined as weak symbols which are overrided by the
platform code. Once all platforms are converted, the "weak" attribute
will be removed and the function made static.

Cc: Arnd Bergmann<arnd@arndb.de>
Cc: Nicolas Pitre<nico@fluxnic.net>
Signed-off-by: Marc Zyngier<redacted>
---
  arch/arm/include/asm/soc.h |   18 ++++++++++++++++
  arch/arm/kernel/setup.c    |   11 ++++++++++
  arch/arm/kernel/smp.c      |   47 ++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 76 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/soc.h b/arch/arm/include/asm/soc.h
index ce92784..2593f90 100644
--- a/arch/arm/include/asm/soc.h
+++ b/arch/arm/include/asm/soc.h

@@ -12,10 +12,28 @@
  #ifndef __ASM_ARM_SOC_H
  #define __ASM_ARM_SOC_H

+struct task_struct;
+
+struct arm_soc_smp_ops {
+	void (*smp_init_cpus)(void);
+	void (*smp_prepare_cpus)(unsigned int max_cpus);
+	void (*smp_secondary_init)(unsigned int cpu);
+	int  (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
+#ifdef CONFIG_HOTPLUG_CPU
+	int  (*cpu_kill)(unsigned int cpu);
+	void (*cpu_die)(unsigned int cpu);
+	int  (*cpu_disable)(unsigned int cpu);
+#endif
+};