rust: inline some init methods

These methods should be inlined for optimization reasons. Failure to do
so can also produce symbol names larger than what `modpost` or `objtool`
can handle.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260605-nova-exports-v4-1-e948c287407c@nvidia.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: Gnurou

rust/kernel/alloc/kbox.rs

@@ -437,6 +437,7 @@ where
 {
     type Initialized = Box<T, A>;
 
+    #[inline]
     fn write_init<E>(mut self, init: impl Init<T, E>) -> Result<Self::Initialized, E> {
         let slot = self.as_mut_ptr();
         // SAFETY: When init errors/panics, slot will get deallocated but not dropped,
@@ -446,6 +447,7 @@ where
         Ok(unsafe { Box::assume_init(self) })
     }
 
+    #[inline]
     fn write_pin_init<E>(mut self, init: impl PinInit<T, E>) -> Result<Pin<Self::Initialized>, E> {
         let slot = self.as_mut_ptr();
         // SAFETY: When init errors/panics, slot will get deallocated but not dropped,

rust/kernel/init.rs

@@ -151,6 +151,7 @@ pub trait InPlaceInit<T>: Sized {
     /// type.
     ///
     /// If `T: !Unpin` it will not be able to move afterwards.
+    #[inline]
     fn pin_init<E>(init: impl PinInit<T, E>, flags: Flags) -> error::Result<Self::PinnedSelf>
     where
         Error: From<E>,
@@ -168,6 +169,7 @@ pub trait InPlaceInit<T>: Sized {
         E: From<AllocError>;
 
     /// Use the given initializer to in-place initialize a `T`.
+    #[inline]
     fn init<E>(init: impl Init<T, E>, flags: Flags) -> error::Result<Self>
     where
         Error: From<E>,

rust/kernel/sync/arc.rs

@@ -712,6 +712,7 @@ impl<T> InPlaceInit<T> for UniqueArc<T> {
 impl<T> InPlaceWrite<T> for UniqueArc<MaybeUninit<T>> {
     type Initialized = UniqueArc<T>;
 
+    #[inline]
     fn write_init<E>(mut self, init: impl Init<T, E>) -> Result<Self::Initialized, E> {
         let slot = self.as_mut_ptr();
         // SAFETY: When init errors/panics, slot will get deallocated but not dropped,
@@ -721,6 +722,7 @@ impl<T> InPlaceWrite<T> for UniqueArc<MaybeUninit<T>> {
         Ok(unsafe { self.assume_init() })
     }
 
+    #[inline]
     fn write_pin_init<E>(mut self, init: impl PinInit<T, E>) -> Result<Pin<Self::Initialized>, E> {
         let slot = self.as_mut_ptr();
         // SAFETY: When init errors/panics, slot will get deallocated but not dropped,
@@ -782,6 +784,7 @@ impl<T> UniqueArc<MaybeUninit<T>> {
     }
 
     /// Initialize `self` using the given initializer.
+    #[inline]
     pub fn init_with<E>(mut self, init: impl Init<T, E>) -> core::result::Result<UniqueArc<T>, E> {
         // SAFETY: The supplied pointer is valid for initialization.
         match unsafe { init.__init(self.as_mut_ptr()) } {
@@ -792,6 +795,7 @@ impl<T> UniqueArc<MaybeUninit<T>> {
     }
 
     /// Pin-initialize `self` using the given pin-initializer.
+    #[inline]
     pub fn pin_init_with<E>(
         mut self,
         init: impl PinInit<T, E>,