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Message-ID: <20250313074537.729578-1-kunwu.chan@linux.dev>
Date: Thu, 13 Mar 2025 15:45:36 +0800
From: Kunwu Chan <kunwu.chan@...ux.dev>
To: ojeda@...nel.org,
alex.gaynor@...il.com,
boqun.feng@...il.com,
gary@...yguo.net,
bjorn3_gh@...tonmail.com,
benno.lossin@...ton.me,
a.hindborg@...nel.org,
aliceryhl@...gle.com,
tmgross@...ch.edu,
dakr@...nel.org,
nathan@...nel.org,
nick.desaulniers+lkml@...il.com,
morbo@...gle.com,
justinstitt@...gle.com
Cc: rust-for-linux@...r.kernel.org,
linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev,
Kunwu Chan <kunwu.chan@...mail.com>,
Grace Deng <Grace.Deng006@...il.com>
Subject: [PATCH] rust: sync: optimize Rust symbol generation for PollCondVar
From: Kunwu Chan <kunwu.chan@...mail.com>
When build 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
ffff800080019e90 T <kernel::sync::poll::PollCondVar>
::new::{closure#0}::{closure#0}::panic_cold_explicit
ffff8000805b8e04 T <kernel::sync::poll::PollCondVar
as kernel::init::PinnedDrop>::drop
ffff8000805b8e04 T <kernel::sync::poll::PollCondVar
as core::ops::drop::Drop>::drop
This Rust symbol
(<kernel::sync::poll::PollCondVar as kernel::init::PinnedDrop>::drop)
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 them inline.
After doing so, the above symbol will not in output.
Signed-off-by: Kunwu Chan <kunwu.chan@...mail.com>
Co-developed-by: Grace Deng <Grace.Deng006@...il.com>
Signed-off-by: Grace Deng <Grace.Deng006@...il.com>
---
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 d5f17153b424..a4f92c545fec 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`.
//
--
2.43.0
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