[PATCH] rust_binder: avoid name mangling for get_work[_local]

[Alice Ryhl <aliceryhl@google.com>]

Currently ps -A shows processes waiting on schedule() in functions with
names such as do_epoll_wait, wait_woken, and the impeccably named
_RNvMs2_NtCs8QPsHWIn21X_16rust_binder_main6threadNtB5_6Thread8get_work.

To improve how ps output looks, give explicit non-mangled names to the
functions where Rust Binder calls schedule(), since these are the most
likely places to show up on ps output.

The name of rust_binder_waitlcl is truncated instead of using _local
suffix because rust_binder_wait_local is sufficiently long that ps shows
unaligned output.

Suggested-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
 drivers/android/binder/process.rs | 1 +
 drivers/android/binder/thread.rs  | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/android/binder/process.rs b/drivers/android/binder/process.rs
index 132055b4790f0ec69a87635b498909df2bf475e2..cf7425e74183966063ab53114637aec7b3672ac8 100644
--- a/drivers/android/binder/process.rs
+++ b/drivers/android/binder/process.rs
@@ -1436,6 +1436,7 @@ pub(crate) fn drop_outstanding_txn(&self) {
         }
     }
 
+    #[export_name = "rust_binder_freeze"]
     pub(crate) fn ioctl_freeze(&self, info: &BinderFreezeInfo) -> Result {
         if info.enable == 0 {
             let msgs = self.prepare_freeze_messages()?;
diff --git a/drivers/android/binder/thread.rs b/drivers/android/binder/thread.rs
index 1f1709a6a77abc1c865cc9387e7ba7493448c71d..2ca8ed8962314b58a3cfeb3ae0aa0ed60f179433 100644
--- a/drivers/android/binder/thread.rs
+++ b/drivers/android/binder/thread.rs
@@ -514,6 +514,7 @@ pub(crate) fn has_current_transaction(&self) -> bool {
     /// Attempts to fetch a work item from the thread-local queue. The behaviour if the queue is
     /// empty depends on `wait`: if it is true, the function waits for some work to be queued (or a
     /// signal); otherwise it returns indicating that none is available.
+    #[export_name = "rust_binder_waitlcl"]
     fn get_work_local(self: &Arc<Self>, wait: bool) -> Result<Option<DLArc<dyn DeliverToRead>>> {
         {
             let mut inner = self.inner.lock();
@@ -552,6 +553,7 @@ fn get_work_local(self: &Arc<Self>, wait: bool) -> Result<Option<DLArc<dyn Deliv
     ///
     /// This must only be called when the thread is not participating in a transaction chain. If it
     /// is, the local version (`get_work_local`) should be used instead.
+    #[export_name = "rust_binder_wait"]
     fn get_work(self: &Arc<Self>, wait: bool) -> Result<Option<DLArc<dyn DeliverToRead>>> {
         // Try to get work from the thread's work queue, using only a local lock.
         {

---
base-commit: cee73b1e840c154f64ace682cb477c1ae2e29cc4
change-id: 20260213-rust-binder-ps-46d9d060243a

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>