Kernel: Remove the limited use of AK::TypeTraits we had in the kernel

This was only used for VMObject and we can do without it there. This is
preparation for migrating to dynamic_cast-based helpers in userspace.

6 files changed, 4 insertions, 19 deletions

diff --git a/Kernel/VM/AnonymousVMObject.h b/Kernel/VM/AnonymousVMObject.h
index 1a0f5f13ba..aa5c189b7f 100644
--- a/Kernel/VM/AnonymousVMObject.h
+++ b/Kernel/VM/AnonymousVMObject.h
@@ -57,7 +57,3 @@ private:
 };
 
 }
-
-AK_BEGIN_TYPE_TRAITS(Kernel::AnonymousVMObject)
-static bool is_type(const Kernel::VMObject& vmobject) { return vmobject.is_anonymous(); }
-AK_END_TYPE_TRAITS()
diff --git a/Kernel/VM/ContiguousVMObject.h b/Kernel/VM/ContiguousVMObject.h
index 0df4f9c40d..13a633ba26 100644
--- a/Kernel/VM/ContiguousVMObject.h
+++ b/Kernel/VM/ContiguousVMObject.h
@@ -52,7 +52,3 @@ private:
 };
 
 }
-
-AK_BEGIN_TYPE_TRAITS(Kernel::ContiguousVMObject)
-static bool is_type(const Kernel::VMObject& vmobject) { return vmobject.is_contiguous(); }
-AK_END_TYPE_TRAITS()
diff --git a/Kernel/VM/InodeVMObject.h b/Kernel/VM/InodeVMObject.h
index 94e7073709..035663aa12 100644
--- a/Kernel/VM/InodeVMObject.h
+++ b/Kernel/VM/InodeVMObject.h
@@ -67,7 +67,3 @@ protected:
 };
 
 }
-
-AK_BEGIN_TYPE_TRAITS(Kernel::InodeVMObject)
-static bool is_type(const Kernel::VMObject& vmobject) { return vmobject.is_inode(); }
-AK_END_TYPE_TRAITS()
diff --git a/Kernel/VM/MemoryManager.cpp b/Kernel/VM/MemoryManager.cpp
index b2f3dcd30f..622b0ba4ca 100644
--- a/Kernel/VM/MemoryManager.cpp
+++ b/Kernel/VM/MemoryManager.cpp
@@ -509,8 +509,10 @@ RefPtr<PhysicalPage> MemoryManager::allocate_user_physical_page(ShouldZeroFill s
     if (!page) {
         // We didn't have a single free physical page. Let's try to free something up!
         // First, we look for a purgeable VMObject in the volatile state.
-        for_each_vmobject_of_type<PurgeableVMObject>([&](auto& vmobject) {
-            int purged_page_count = vmobject.purge_with_interrupts_disabled({});
+        for_each_vmobject([&](auto& vmobject) {
+            if (!vmobject.is_purgeable())
+                return IterationDecision::Continue;
+            int purged_page_count = static_cast<PurgeableVMObject&>(vmobject).purge_with_interrupts_disabled({});
             if (purged_page_count) {
                 klog() << "MM: Purge saved the day! Purged " << purged_page_count << " pages from PurgeableVMObject{" << &vmobject << "}";
                 page = find_free_user_physical_page();
diff --git a/Kernel/VM/PurgeableVMObject.h b/Kernel/VM/PurgeableVMObject.h
index 846222deab..5e100aa5f0 100644
--- a/Kernel/VM/PurgeableVMObject.h
+++ b/Kernel/VM/PurgeableVMObject.h
@@ -65,7 +65,3 @@ private:
 };
 
 }
-
-AK_BEGIN_TYPE_TRAITS(Kernel::PurgeableVMObject)
-static bool is_type(const Kernel::VMObject& vmobject) { return vmobject.is_purgeable(); }
-AK_END_TYPE_TRAITS()
diff --git a/Kernel/VM/VMObject.h b/Kernel/VM/VMObject.h
index 11bb4dada5..e126113f79 100644
--- a/Kernel/VM/VMObject.h
+++ b/Kernel/VM/VMObject.h
@@ -29,7 +29,6 @@
 #include <AK/InlineLinkedList.h>
 #include <AK/RefCounted.h>
 #include <AK/RefPtr.h>
-#include <AK/TypeCasts.h>
 #include <AK/Vector.h>
 #include <AK/Weakable.h>
 #include <Kernel/Lock.h>