[PATCH 18/21] LoongArch: Use the __weak version of arch_unregister_cpu()

[Oracle]

From: James Morse <james.morse@xxxxxxx>

LoongArch provides its own arch_unregister_cpu(). This clears the
hotpluggable flag, then unregisters the CPU.

It isn't necessary to clear the hotpluggable flag when unregistering
a cpu. unregister_cpu() writes NULL to the percpu cpu_sys_devices
pointer, meaning cpu_is_hotpluggable() will return false, as
get_cpu_device() has returned NULL.

Remove arch_unregister_cpu() and use the __weak version.

Signed-off-by: James Morse <james.morse@xxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
---
Changes since RFC v3:
 * Adapt for removal of EXPORT_SYMBOL()s
---
 arch/loongarch/kernel/topology.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/arch/loongarch/kernel/topology.c b/arch/loongarch/kernel/topology.c
index 7dfb46c68f58..866c2c9ef6ab 100644
--- a/arch/loongarch/kernel/topology.c
+++ b/arch/loongarch/kernel/topology.c
@@ -18,12 +18,4 @@ int arch_register_cpu(int cpu)
 	c->hotpluggable = !io_master(cpu);
 	return register_cpu(c, cpu);
 }
-
-void arch_unregister_cpu(int cpu)
-{
-	struct cpu *c = &per_cpu(cpu_devices, cpu);
-
-	c->hotpluggable = 0;
-	unregister_cpu(c);
-}
 #endif
-- 
2.30.2