rust: ensure IoMem's build_assert! call is inlined

This increases chance that `build_assert!` call in `check_offset` is
optimized away under lower optimization levels and avoid false
positives.

Signed-off-by: Gary Guo <[email protected]>

Author: nbdd0121

rust/kernel/io_mem.rs

@@ -68,6 +68,7 @@ macro_rules! define_read {
         ///
         /// If the offset is not known at compile time, the build will fail.
         $(#[$attr])*
+        #[inline]
         pub fn $name(&self, offset: usize) -> $type_name {
             Self::check_offset::<$type_name>(offset);
             let ptr = self.ptr.wrapping_add(offset);
@@ -100,6 +101,7 @@ macro_rules! define_write {
         ///
         /// If the offset is not known at compile time, the build will fail.
         $(#[$attr])*
+        #[inline]
         pub fn $name(&self, value: $type_name, offset: usize) {
             Self::check_offset::<$type_name>(offset);
             let ptr = self.ptr.wrapping_add(offset);
@@ -164,6 +166,7 @@ impl<const SIZE: usize> IoMem<SIZE> {
         }
     }
 
+    #[inline]
     const fn offset_ok<T>(offset: usize) -> bool {
         let type_size = core::mem::size_of::<T>();
         if let Some(end) = offset.checked_add(type_size) {
@@ -183,6 +186,7 @@ impl<const SIZE: usize> IoMem<SIZE> {
         }
     }
 
+    #[inline]
     const fn check_offset<T>(offset: usize) {
         crate::build_assert!(Self::offset_ok::<T>(offset), "IoMem offset overflow");
     }