refactor: remove NullLock

kernel/src/sync.rs

@@ -4,27 +4,12 @@ use core::cell::UnsafeCell;
 use core::ops::{Deref, DerefMut};
 use crate::arch::platform::{irq_mask_save, irq_restore};
 
-/// Dummy lock implementation, does not do any locking.
-///
-/// Only safe to use before I implement context switching or
-/// interrupts are enabled.
-#[repr(transparent)]
-pub struct NullLock<T: ?Sized> {
-    value: UnsafeCell<T>,
-}
-
 /// Same as [NullLock], but ensures IRQs are disabled while
 /// the lock is held
 pub struct IrqSafeNullLock<T: ?Sized> {
     value: UnsafeCell<T>,
 }
 
-/// Dummy lock guard for [NullLock]
-#[repr(transparent)]
-pub struct NullLockGuard<'a, T: ?Sized> {
-    value: &'a mut T,
-}
-
 /// Same as [NullLockGuard], but reverts IRQ mask back to normal
 /// when dropped
 pub struct IrqSafeNullLockGuard<'a, T: ?Sized> {
@@ -76,39 +61,4 @@ impl<T: ?Sized> Drop for IrqSafeNullLockGuard<'_, T> {
     }
 }
 
-impl<T> NullLock<T> {
-    /// Constructs a new instance of the lock, wrapping `value`
-    #[inline(always)]
-    pub const fn new(value: T) -> Self {
-        Self {
-            value: UnsafeCell::new(value),
-        }
-    }
-
-    /// Returns [NullLockGuard] for this lock
-    #[inline(always)]
-    pub fn lock(&self) -> NullLockGuard<T> {
-        NullLockGuard {
-            value: unsafe { &mut *self.value.get() },
-        }
-    }
-}
-
-impl<T: ?Sized> Deref for NullLockGuard<'_, T> {
-    type Target = T;
-
-    fn deref(&self) -> &Self::Target {
-        self.value
-    }
-}
-
-impl<T: ?Sized> DerefMut for NullLockGuard<'_, T> {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        self.value
-    }
-}
-
-unsafe impl<T: ?Sized> Sync for NullLock<T> {}
 unsafe impl<T: ?Sized> Sync for IrqSafeNullLock<T> {}
-
-pub use IrqSafeNullLock as Spin;