Add a kmalloc_eternal() for things that will never be destroyed.

VirtualFileSystem/FullDevice.h

@@ -3,6 +3,7 @@
 #include "CharacterDevice.h"
 
 class FullDevice final : public CharacterDevice {
+    AK_MAKE_ETERNAL
 public:
     FullDevice();
     virtual ~FullDevice();

VirtualFileSystem/NullDevice.h

@@ -3,6 +3,7 @@
 #include "CharacterDevice.h"
 
 class NullDevice final : public CharacterDevice {
+    AK_MAKE_ETERNAL
 public:
     NullDevice();
     virtual ~NullDevice() override;

VirtualFileSystem/RandomDevice.h

@@ -3,6 +3,7 @@
 #include "CharacterDevice.h"
 
 class RandomDevice final : public CharacterDevice {
+    AK_MAKE_ETERNAL
 public:
     RandomDevice();
     virtual ~RandomDevice() override;

VirtualFileSystem/VirtualFileSystem.h

@@ -28,6 +28,7 @@ inline constexpr dword encodedDevice(unsigned major, unsigned minor)
 }
 
 class VirtualFileSystem {
+    AK_MAKE_ETERNAL
 public:
     static void initializeGlobals();
     static SpinLock& lock();

VirtualFileSystem/ZeroDevice.h

@@ -3,6 +3,7 @@
 #include "CharacterDevice.h"
 
 class ZeroDevice final : public CharacterDevice {
+    AK_MAKE_ETERNAL
 public:
     ZeroDevice();
     virtual ~ZeroDevice() override;