From 0fc3870786cb5df8d42cad76ca7c86d79024ff37 Mon Sep 17 00:00:00 2001
From: Alice Ryhl <aliceryhl@google.com>
Date: Thu, 6 Feb 2025 14:15:19 +0000
Subject: [PATCH] ANDROID: make list_lru/task_work C functions available to
 Rust

Binder calls these C functions directly, so they need to be callable
from Rust. This change can be reverted once b/394605825 is fixed.

Bug: 388786466
Bug: 394605825
Change-Id: I02af16a1dc50a3a7595c0f40494e8054e563e74d
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
 rust/bindings/bindings_helper.h |  3 +++
 rust/helpers/binder.c           | 22 ++++++++++++++++++++++
 rust/helpers/helpers.c          |  1 +
 3 files changed, 26 insertions(+)
 create mode 100644 rust/helpers/binder.c

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index 6af795820d13..2675215ec32e 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -13,11 +13,13 @@
 #include <linux/cred.h>
 #include <linux/errname.h>
 #include <linux/ethtool.h>
+#include <linux/fdtable.h>
 #include <linux/file.h>
 #include <linux/firmware.h>
 #include <linux/fs.h>
 #include <linux/jiffies.h>
 #include <linux/jump_label.h>
+#include <linux/list_lru.h>
 #include <linux/mdio.h>
 #include <linux/miscdevice.h>
 #include <linux/phy.h>
@@ -27,6 +29,7 @@
 #include <linux/sched.h>
 #include <linux/security.h>
 #include <linux/slab.h>
+#include <linux/task_work.h>
 #include <linux/tracepoint.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
diff --git a/rust/helpers/binder.c b/rust/helpers/binder.c
new file mode 100644
index 000000000000..71534ac954be
--- /dev/null
+++ b/rust/helpers/binder.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/list_lru.h>
+#include <linux/task_work.h>
+
+unsigned long rust_helper_list_lru_count(struct list_lru *lru)
+{
+	return list_lru_count(lru);
+}
+
+unsigned long rust_helper_list_lru_walk(struct list_lru *lru,
+					list_lru_walk_cb isolate, void *cb_arg,
+					unsigned long nr_to_walk)
+{
+	return list_lru_walk(lru, isolate, cb_arg, nr_to_walk);
+}
+
+void rust_helper_init_task_work(struct callback_head *twork,
+				task_work_func_t func)
+{
+	init_task_work(twork, func);
+}
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 24accbfa244a..c4e5c7d78cf7 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -7,6 +7,7 @@
  * Sorted alphabetically.
  */
 
+#include "binder.c"
 #include "blk.c"
 #include "bug.c"
 #include "build_assert.c"