Remove unused and deduplicate identical arch specific consts

src/allocator/linked_list.rs

@@ -29,9 +29,9 @@ unsafe impl GlobalAlloc for Allocator {
                         super::map_heap(
                             &mut KernelMapper::lock_rw(),
                             crate::KERNEL_HEAP_OFFSET + size,
-                            crate::KERNEL_HEAP_SIZE,
+                            super::KERNEL_HEAP_SIZE,
                         );
-                        heap.extend(crate::KERNEL_HEAP_SIZE);
+                        heap.extend(super::KERNEL_HEAP_SIZE);
                     }
                 }
             }

src/allocator/mod.rs

@@ -7,6 +7,9 @@ use rmm::{Flusher, FrameAllocator};
 pub use self::linked_list::Allocator;
 mod linked_list;
 
+/// Size of kernel heap
+const KERNEL_HEAP_SIZE: usize = ::rmm::MEGABYTE;
+
 unsafe fn map_heap(mapper: &mut KernelMapper<true>, offset: usize, size: usize) {
     let mut flush_all = PageFlushAll::new();
 
@@ -37,7 +40,7 @@ unsafe fn map_heap(mapper: &mut KernelMapper<true>, offset: usize, size: usize)
 pub unsafe fn init() {
     unsafe {
         let offset = crate::KERNEL_HEAP_OFFSET;
-        let size = crate::KERNEL_HEAP_SIZE;
+        let size = KERNEL_HEAP_SIZE;
 
         // Map heap pages
         map_heap(&mut KernelMapper::lock_rw(), offset, size);