MIPS: SGI-IP27: do boot CPU init later

To make use of per_cpu variables in interrupt code per_cpu_init() must
be done after setup_per_cpu_areas(). This is achieved by calling it
in smp_prepare_boot_cpu() via a new smp_ops method.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

arch/mips/include/asm/smp-ops.h

@@ -29,6 +29,7 @@ struct plat_smp_ops {
 	int (*boot_secondary)(int cpu, struct task_struct *idle);
 	void (*smp_setup)(void);
 	void (*prepare_cpus)(unsigned int max_cpus);
+	void (*prepare_boot_cpu)(void);
 #ifdef CONFIG_HOTPLUG_CPU
 	int (*cpu_disable)(void);
 	void (*cpu_die)(unsigned int cpu);

arch/mips/kernel/smp.c

@@ -444,6 +444,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 /* preload SMP state for boot cpu */
 void smp_prepare_boot_cpu(void)
 {
+	if (mp_ops->prepare_boot_cpu)
+		mp_ops->prepare_boot_cpu();
 	set_cpu_possible(0, true);
 	set_cpu_online(0, true);
 }

arch/mips/sgi-ip27/ip27-init.c

@@ -212,7 +212,6 @@ void __init plat_mem_setup(void)
 #endif
 
 	ioc3_eth_init();
-	per_cpu_init();
 
 	set_io_port_base(IO_BASE);
 }

arch/mips/sgi-ip27/ip27-smp.c

@@ -177,7 +177,7 @@ static void ip27_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 		ip27_send_ipi_single(i, action);
 }
 
-static void ip27_init_secondary(void)
+static void ip27_init_cpu(void)
 {
 	per_cpu_init();
 }
@@ -235,9 +235,10 @@ static void __init ip27_prepare_cpus(unsigned int max_cpus)
 const struct plat_smp_ops ip27_smp_ops = {
 	.send_ipi_single	= ip27_send_ipi_single,
 	.send_ipi_mask		= ip27_send_ipi_mask,
-	.init_secondary		= ip27_init_secondary,
+	.init_secondary		= ip27_init_cpu,
 	.smp_finish		= ip27_smp_finish,
 	.boot_secondary		= ip27_boot_secondary,
 	.smp_setup		= ip27_smp_setup,
 	.prepare_cpus		= ip27_prepare_cpus,
+	.prepare_boot_cpu	= ip27_init_cpu,
 };