Kernel: Switch singletons to use new Singleton class

MemoryManager cannot use the Singleton class because
MemoryManager::initialize is called before the global constructors
are run. That caused the Singleton to be re-initialized, causing
it to create another MemoryManager instance.

Fixes #3226

1 files changed, 1 insertions, 3 deletions

diff --git a/Kernel/Net/LoopbackAdapter.h b/Kernel/Net/LoopbackAdapter.h
index b87bb5003f..cebedfe7a3 100644
--- a/Kernel/Net/LoopbackAdapter.h
+++ b/Kernel/Net/LoopbackAdapter.h
@@ -33,15 +33,13 @@ namespace Kernel {
 class LoopbackAdapter final : public NetworkAdapter {
     AK_MAKE_ETERNAL
 public:
+    LoopbackAdapter();
     static LoopbackAdapter& the();
 
     virtual ~LoopbackAdapter() override;
 
     virtual void send_raw(ReadonlyBytes) override;
     virtual const char* class_name() const override { return "LoopbackAdapter"; }
-
-private:
-    LoopbackAdapter();
 };
 
 }