[PATCH v2 2/5] rust: sync: Mark PollCondVar::drop() inline

[Boqun Feng]

From: Kunwu Chan <kunwu.chan@xxxxxxxxxxx>

When building the kernel using the llvm-18.1.3-rust-1.85.0-x86_64
with ARCH=arm64, the following symbols are generated:

$nm vmlinux | grep ' _R'.*PollCondVar  | rustfilt
... T <kernel::sync::poll::PollCondVar as kernel::init::PinnedDrop>::drop
...

This Rust symbol is trivial wrappers around the C functions
__wake_up_pollfree() and synchronize_rcu(). It doesn't make sense to go
through a trivial wrapper for its functions, so mark it inline.

[boqun: Reword the commit title and re-format the commit log per tip
tree's requirement, remove unnecessary information from "nm vmlinux"
result.]

Link: https://github.com/Rust-for-Linux/linux/issues/1145
Suggested-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Co-developed-by: Grace Deng <Grace.Deng006@xxxxxxxxx>
Signed-off-by: Grace Deng <Grace.Deng006@xxxxxxxxx>
Signed-off-by: Kunwu Chan <kunwu.chan@xxxxxxxxxxx>
Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Reviewed-by: Benno Lossin <benno.lossin@xxxxxxxxx>
Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
Link: https://lore.kernel.org/r/20250317025205.2366518-1-kunwu.chan@xxxxxxxxx
---
 rust/kernel/sync/poll.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/kernel/sync/poll.rs b/rust/kernel/sync/poll.rs
index d7e6e59e124b..7b973d72229b 100644
--- a/rust/kernel/sync/poll.rs
+++ b/rust/kernel/sync/poll.rs
@@ -107,6 +107,7 @@ fn deref(&self) -> &CondVar {
 
 #[pinned_drop]
 impl PinnedDrop for PollCondVar {
+    #[inline]
     fn drop(self: Pin<&mut Self>) {
         // Clear anything registered using `register_wait`.
         //
-- 
2.39.5 (Apple Git-154)