From 49768524d4c3cdc5358c81e92062b9e89ec1e9d1 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sat, 1 Jun 2019 17:51:48 +0200
Subject: [PATCH] VM: Get rid of KernelPagingScope.

Every page directory inherits the kernel page directory, so there's no need
to explicitly enter the kernel's paging scope anymore.
---
 Kernel/VM/MemoryManager.cpp | 17 -----------------
 Kernel/VM/MemoryManager.h   |  6 ------
 2 files changed, 23 deletions(-)

diff --git a/Kernel/VM/MemoryManager.cpp b/Kernel/VM/MemoryManager.cpp
index 06e66f670bb..b147bbfc06c 100644
--- a/Kernel/VM/MemoryManager.cpp
+++ b/Kernel/VM/MemoryManager.cpp
@@ -454,12 +454,6 @@ void MemoryManager::enter_process_paging_scope(Process& process)
     asm volatile("movl %%eax, %%cr3"::"a"(process.page_directory().cr3()):"memory");
 }
 
-void MemoryManager::enter_kernel_paging_scope()
-{
-    InterruptDisabler disabler;
-    asm volatile("movl %%eax, %%cr3"::"a"(kernel_page_directory().cr3()):"memory");
-}
-
 void MemoryManager::flush_entire_tlb()
 {
     asm volatile(
@@ -666,14 +660,3 @@ ProcessPagingScope::~ProcessPagingScope()
 {
     MM.enter_process_paging_scope(current->process());
 }
-
-KernelPagingScope::KernelPagingScope()
-{
-    ASSERT(current);
-    MM.enter_kernel_paging_scope();
-}
-
-KernelPagingScope::~KernelPagingScope()
-{
-    MM.enter_process_paging_scope(current->process());
-}
diff --git a/Kernel/VM/MemoryManager.h b/Kernel/VM/MemoryManager.h
index b45cfcbf006..3413e57945e 100644
--- a/Kernel/VM/MemoryManager.h
+++ b/Kernel/VM/MemoryManager.h
@@ -51,7 +51,6 @@ public:
     void populate_page_directory(PageDirectory&);
 
     void enter_process_paging_scope(Process&);
-    void enter_kernel_paging_scope();
 
     bool validate_user_read(const Process&, LinearAddress) const;
     bool validate_user_write(const Process&, LinearAddress) const;
@@ -238,8 +237,3 @@ struct ProcessPagingScope {
     ProcessPagingScope(Process&);
     ~ProcessPagingScope();
 };
-
-struct KernelPagingScope {
-    KernelPagingScope();
-    ~KernelPagingScope();
-};