remove compiler warnings

src/lib.rs

@@ -16,7 +16,6 @@
 #![allow(clippy::not_unsafe_ptr_arg_deref)]
 #![allow(clippy::missing_safety_doc)]
 #![allow(incomplete_features)]
-#![feature(asm)]
 #![feature(abi_x86_interrupt)]
 #![feature(allocator_api)]
 #![feature(asm)]
@@ -30,7 +29,6 @@
 #![feature(naked_functions)]
 #![feature(panic_info_message)]
 #![feature(specialization)]
-#![feature(naked_functions)]
 #![feature(nonnull_slice_from_raw_parts)]
 #![feature(core_intrinsics)]
 #![feature(alloc_error_handler)]

src/scheduler/mod.rs

@@ -27,7 +27,6 @@ use crate::config::*;
 use crate::kernel::scheduler::TaskStacks;
 use crate::scheduler::task::*;
 use crate::synch::spinlock::*;
-use crate::{DEFAULT_STACK_SIZE, KERNEL_STACK_SIZE};
 
 pub mod task;