i2c: rust: mark I2cAdapter methods as inline

When building the kernel using llvm-19.1.7-rust-1.85.0-x86_64, the
following symbols are generated:

$ nm vmlinux | grep ' _R'.*I2cAdapter | rustfilt
ffffffff817ff380 T <kernel::i2c::I2cAdapter>::get
ffffffff817ff400 T <kernel::i2c::I2cAdapter as kernel::sync::aref::AlwaysRefCounted>::dec_ref
ffffffff817ff3e0 T <kernel::i2c::I2cAdapter as kernel::sync::aref::AlwaysRefCounted>::inc_ref

However, these Rust symbols are trivial wrappers around the
`i2c_get_adapter` and `i2c_put_adapter` functions. It doesn't make sense
to go through a trivial wrapper for these functions.

Link: https://github.com/Rust-for-Linux/linux/issues/1145
Suggested-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Nicolás Antinori <nico.antinori.7@gmail.com>
Reviewed-by: Onur Özkan <work@onurozkan.dev>
Reviewed-by: Igor Korotin <igor.korotin@linux.dev>
Signed-off-by: Igor Korotin <igor.korotin@linux.dev>

diff --git a/rust/kernel/i2c.rs b/rust/kernel/i2c.rs
index dd9271a..c4002e2 100644 (file)
--- a/rust/kernel/i2c.rs
+++ b/rust/kernel/i2c.rs
@@ -404,6 +404,7 @@ impl I2cAdapter {
     }
 
     /// Gets pointer to an `i2c_adapter` by index.
+    #[inline]
     pub fn get(index: i32) -> Result<ARef<Self>> {
         // SAFETY: `index` must refer to a valid I2C adapter; the kernel
         // guarantees that `i2c_get_adapter(index)` returns either a valid
@@ -425,11 +426,13 @@ kernel::impl_device_context_into_aref!(I2cAdapter);
 
 // SAFETY: Instances of `I2cAdapter` are always reference-counted.
 unsafe impl AlwaysRefCounted for I2cAdapter {
+    #[inline]
     fn inc_ref(&self) {
         // SAFETY: The existence of a shared reference guarantees that the refcount is non-zero.
         unsafe { bindings::i2c_get_adapter(self.index()) };
     }
 
+    #[inline]
     unsafe fn dec_ref(obj: NonNull<Self>) {
         // SAFETY: The safety requirements guarantee that the refcount is non-zero.
         unsafe { bindings::i2c_put_adapter(obj.as_ref().as_raw()) }