Kernel: Use a FixedArray for VMObject::m_physical_pages

This makes VMObject 8 bytes smaller since we can use the array size as
the page count.

The size() is now also computed from the page count instead of being
a separate value. This makes sizes always be a multiple of PAGE_SIZE,
which is sane.

1 files changed, 3 insertions, 6 deletions

diff --git a/Kernel/VM/VMObject.cpp b/Kernel/VM/VMObject.cpp
index e7885ffc4d..24c3b71352 100644
--- a/Kernel/VM/VMObject.cpp
+++ b/Kernel/VM/VMObject.cpp
@@ -4,18 +4,15 @@
 #include <Kernel/VM/VMObject.h>
 
 VMObject::VMObject(const VMObject& other)
-    : m_size(other.m_size)
-    , m_physical_pages(other.m_physical_pages)
+    : m_physical_pages(other.m_physical_pages)
 {
     MM.register_vmo(*this);
 }
 
-VMObject::VMObject(size_t size, ShouldFillPhysicalPages should_fill_physical_pages)
-    : m_size(size)
+VMObject::VMObject(size_t size)
+    : m_physical_pages(ceil_div(size, PAGE_SIZE))
 {
     MM.register_vmo(*this);
-    if (should_fill_physical_pages == ShouldFillPhysicalPages::Yes)
-        m_physical_pages.resize(page_count());
 }
 
 VMObject::~VMObject()