[WIP] update memory_addr to new version, use git reference temporarily

Cargo.toml

@@ -13,3 +13,7 @@ categories = ["os", "memory-management", "no-std"]
 
 [dependencies]
 memory_addr = "0.2"
+
+[patch.crates-io]
+# todo: update to new version of `memory_addr` on `crates.io` once it get released
+memory_addr = { git = "https://github.com/arceos-hypervisor/memory_addr.git", rev = "95f42c9" }

src/area.rs

@@ -35,7 +35,7 @@ pub struct MemoryArea<F: Copy, P, B: MappingBackend<F, P>> {
 
 impl<F: Copy, P, B: MappingBackend<F, P>> MemoryArea<F, P, B> {
     /// Creates a new memory area.
-    pub const fn new(start: VirtAddr, size: usize, flags: F, backend: B) -> Self {
+    pub fn new(start: VirtAddr, size: usize, flags: F, backend: B) -> Self {
         Self {
             va_range: VirtAddrRange::from_start_size(start, size),
             flags,
@@ -65,7 +65,7 @@ impl<F: Copy, P, B: MappingBackend<F, P>> MemoryArea<F, P, B> {
     }
 
     /// Returns the size of the memory area.
-    pub const fn size(&self) -> usize {
+    pub fn size(&self) -> usize {
         self.va_range.size()
     }