Fix some paging related bugs exposed by the spawn stress test.

- Process::exec() needs to restore the original paging scope when called
  on a non-current process.
- Add missing InterruptDisabler guards around g_processes access.
- Only flush the TLB when modifying the active page tables.

1 files changed, 2 insertions, 0 deletions

diff --git a/Kernel/MemoryManager.h b/Kernel/MemoryManager.h
index 6c4b19f7be..6ec6c5f95c 100644
--- a/Kernel/MemoryManager.h
+++ b/Kernel/MemoryManager.h
@@ -55,6 +55,8 @@ private:
 struct PageDirectory {
     dword entries[1024];
     RetainPtr<PhysicalPage> physical_pages[1024];
+
+    bool is_active() const;
 };
 
 class VMObject : public Retainable<VMObject> {