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

@@ -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>

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);
+}

rust/helpers/helpers.c

@@ -7,6 +7,7 @@
  * Sorted alphabetically.
  */
 
+#include "binder.c"
 #include "blk.c"
 #include "bug.c"
 #include "build_assert.c"