[PATCH] ARM: tegra: add cpu_disable for hotplug

[Joseph Lo]

The Tegra114 could hotplug the CPU0, but the common cpu_disable didn't
support that. Adding a Tegra specific cpu_disable function for it.

Signed-off-by: Joseph Lo <josephl at nvidia.com>
---
This patch depends on the series of "ARM: tegra114: add CPU hotplug support".
---
 arch/arm/mach-tegra/common.h  |  1 +
 arch/arm/mach-tegra/hotplug.c | 10 ++++++++++
 arch/arm/mach-tegra/platsmp.c |  1 +
 3 files changed, 12 insertions(+)

diff --git a/arch/arm/mach-tegra/common.h b/arch/arm/mach-tegra/common.h
index 5900cc4..32f8eb3 100644
--- a/arch/arm/mach-tegra/common.h
+++ b/arch/arm/mach-tegra/common.h
@@ -2,3 +2,4 @@ extern struct smp_operations tegra_smp_ops;
 
 extern int tegra_cpu_kill(unsigned int cpu);
 extern void tegra_cpu_die(unsigned int cpu);
+extern int tegra_cpu_disable(unsigned int cpu);
diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c
index d07f152..9695b63 100644
--- a/arch/arm/mach-tegra/hotplug.c
+++ b/arch/arm/mach-tegra/hotplug.c
@@ -46,6 +46,16 @@ void __ref tegra_cpu_die(unsigned int cpu)
 	BUG();
 }
 
+int tegra_cpu_disable(unsigned int cpu)
+{
+	switch (tegra_chip_id) {
+	case TEGRA114:
+		return 0;
+	default:
+		return cpu == 0 ? -EPERM : 0;
+	}
+}
+
 void __init tegra_hotplug_init(void)
 {
 	if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index 554aedc..24db4ac 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -196,5 +196,6 @@ struct smp_operations tegra_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= tegra_cpu_kill,
 	.cpu_die		= tegra_cpu_die,
+	.cpu_disable		= tegra_cpu_disable,
 #endif
 };
-- 
1.8.2.2