[tip: locking/core] rust: sync: Use safe synchronize_rcu() abstraction in poll

[tip-bot2 for Philipp Stanner]

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     47c3367ff096e66f614ed3cdadece26ffc04b5e8
Gitweb:        https://git.kernel.org/tip/47c3367ff096e66f614ed3cdadece26ffc04b5e8
Author:        Philipp Stanner <phasta@xxxxxxxxxx>
AuthorDate:    Wed, 24 Jun 2026 17:07:04 +02:00
Committer:     Boqun Feng <boqun@xxxxxxxxxx>
CommitterDate: Tue, 04 Aug 2026 05:52:54 -07:00

rust: sync: Use safe synchronize_rcu() abstraction in poll

We now have a safe wrapper for the foreign function synchronize_rcu().

Use it in poll.rs.

Signed-off-by: Philipp Stanner <phasta@xxxxxxxxxx>
Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
Reviewed-by: Onur Özkan <work@xxxxxxxxxxxxx>
Reviewed-by: Danilo Krummrich <dakr@xxxxxxxxxx>
Reviewed-by: Gary Guo <gary@xxxxxxxxxxx>
Signed-off-by: Boqun Feng <boqun@xxxxxxxxxx>
Link: https://patch.msgid.link/20260624150704.1504001-5-phasta@xxxxxxxxxx
---
 rust/kernel/sync/poll.rs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/rust/kernel/sync/poll.rs b/rust/kernel/sync/poll.rs
index 0ec985d..5aa0ce9 100644
--- a/rust/kernel/sync/poll.rs
+++ b/rust/kernel/sync/poll.rs
@@ -8,7 +8,11 @@ use crate::{
     bindings,
     fs::File,
     prelude::*,
-    sync::{CondVar, LockClassKey},
+    sync::{
+        rcu::synchronize_rcu,
+        CondVar,
+        LockClassKey, //
+    }, //
 };
 use core::{marker::PhantomData, ops::Deref};
 
@@ -99,8 +103,6 @@ impl PinnedDrop for PollCondVar {
         unsafe { bindings::__wake_up_pollfree(self.inner.wait_queue_head.get()) };
 
         // Wait for epoll items to be properly removed.
-        //
-        // SAFETY: Just an FFI call.
-        unsafe { bindings::synchronize_rcu() };
+        synchronize_rcu();
     }
 }