Remove unused imports and methods

Author: phil-opp

src/frame_allocator.rs

@@ -1,6 +1,5 @@
 use os_bootinfo::{MemoryMap, MemoryRegion, MemoryRegionType};
-use x86_64::structures::paging::{PhysFrame, PageSize, PhysFrameRange};
-use x86_64::PhysAddr;
+use x86_64::structures::paging::{PhysFrame, PhysFrameRange};
 
 pub(crate) struct FrameAllocator<'a> {
     pub memory_map: &'a mut MemoryMap,
@@ -57,28 +56,6 @@ impl<'a> FrameAllocator<'a> {
         }
     }
 
-    pub(crate) fn deallocate_frame(&mut self, frame: PhysFrame) {
-        // try to find an existing region of same type that can be enlarged
-        let mut iter = self.memory_map.iter_mut().peekable();
-        while let Some(region) = iter.next() {
-            if region.range.end == frame && region.region_type == MemoryRegionType::Usable {
-                region.range.end += 1;
-                if let Some(next) = iter.next() {
-                    if next.range.start == frame {
-                        next.range.start += 1;
-                    }
-                }
-                return;
-            }
-        }
-
-        // insert frame as a new region
-        self.memory_map.add_region(MemoryRegion {
-            range: PhysFrame::range(frame, frame + 1),
-            region_type: MemoryRegionType::Usable,
-        });
-    }
-
     /// Marks the passed region in the memory map.
     ///
     /// Panics if a non-usable region (e.g. a reserved region) overlaps with the passed region.

src/page_table.rs

@@ -3,7 +3,7 @@ use frame_allocator::FrameAllocator;
 use os_bootinfo::MemoryRegionType;
 use x86_64::instructions::tlb;
 use x86_64::structures::paging::{MapToError, RecursivePageTable, UnmapError};
-use x86_64::structures::paging::{Page, PageTableFlags, PhysFrame, Mapper, PageSize, Size4KB, Size2MB};
+use x86_64::structures::paging::{Page, PageTableFlags, PhysFrame, Mapper, PageSize, Size4KB};
 use x86_64::{align_up, PhysAddr, VirtAddr};
 use xmas_elf::program::{self, ProgramHeader64};