diff --git a/kernel/src/arch/riscv/backtrace.rs b/kernel/src/arch/riscv/backtrace.rs
index 5f5ee44..d659b94 100644
--- a/kernel/src/arch/riscv/backtrace.rs
+++ b/kernel/src/arch/riscv/backtrace.rs
@@ -55,8 +55,8 @@ impl Iterator for crate::plat::backtrace::FrameWalker {
             return None;
         }
 
-        let prev_fp = unsafe { *(self.current_fp.as_const_ptr() as *const usize).offset(-2) };
-        let prev_pc = unsafe { *(self.current_fp.as_const_ptr() as *const usize).offset(-1) };
+        let prev_fp = unsafe { *self.current_fp.as_const_ptr::<usize>().offset(-2) };
+        let prev_pc = unsafe { *self.current_fp.as_const_ptr::<usize>().offset(-1) };
 
         self.current_fp = VirtAddr::from(prev_fp);
         self.current_pc = VirtAddr::from(prev_pc);
diff --git a/xtask/src/artifact.rs b/xtask/src/artifact.rs
index c6b54c4..c162e01 100644
--- a/xtask/src/artifact.rs
+++ b/xtask/src/artifact.rs
@@ -51,12 +51,6 @@ impl Arch {
         }
     }
 
-    pub fn bits(&self) -> u32 {
-        match self {
-            Arch::RISCV64 => 64,
-        }
-    }
-
     pub fn board_arch_name(&self) -> String {
         "riscv".to_string()
     }