[PATCH v2] rust: helpers: move list_lru and task_work helpers out of binder.c

[Xiaobo Liu]

The helpers in binder.c wrap generic list_lru and task_work inline
functions and have nothing to do with binder. Move each of them to a
file named after its own C header:

  - list_lru helpers move to list_lru.c,
  - init_task_work moves to task_work.c.

Add the new list_lru.c to the SHRINKER entry in MAINTAINERS, which
already covers include/linux/list_lru.h.

Signed-off-by: Xiaobo Liu <cppcoffee@xxxxxxxxx>
---
 MAINTAINERS                           |  1 +
 rust/helpers/helpers.c                |  3 ++-
 rust/helpers/{binder.c => list_lru.c} |  7 -------
 rust/helpers/task_work.c              | 13 +++++++++++++
 4 files changed, 16 insertions(+), 8 deletions(-)
 rename rust/helpers/{binder.c => list_lru.c} (72%)
 create mode 100644 rust/helpers/task_work.c

diff --git a/MAINTAINERS b/MAINTAINERS
index ba45953bb..428992431 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -24590,6 +24590,7 @@ S:	Maintained
 F:	Documentation/admin-guide/mm/shrinker_debugfs.rst
 F:	include/linux/list_lru.h
 F:	include/linux/shrinker.h
+F:	rust/helpers/list_lru.c
 F:	mm/list_lru.c
 F:	mm/shrinker.c
 F:	mm/shrinker_debug.c
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 998e31052..ea34101b9 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -43,7 +43,6 @@
 #include "atomic_ext.c"
 #include "auxiliary.c"
 #include "barrier.c"
-#include "binder.c"
 #include "bitmap.c"
 #include "bitops.c"
 #include "blk.c"
@@ -69,6 +68,7 @@
 #include "jump_label.c"
 #include "kunit.c"
 #include "list.c"
+#include "list_lru.c"
 #include "maple_tree.c"
 #include "mm.c"
 #include "mutex.c"
@@ -93,6 +93,7 @@
 #include "string.c"
 #include "sync.c"
 #include "task.c"
+#include "task_work.c"
 #include "time.c"
 #include "uaccess.c"
 #include "usb.c"
diff --git a/rust/helpers/binder.c b/rust/helpers/list_lru.c
similarity index 72%
rename from rust/helpers/binder.c
rename to rust/helpers/list_lru.c
index a2327f1b3..3b88d1a96 100644
--- a/rust/helpers/binder.c
+++ b/rust/helpers/list_lru.c
@@ -5,7 +5,6 @@
  */
 
 #include <linux/list_lru.h>
-#include <linux/task_work.h>
 
 __rust_helper unsigned long rust_helper_list_lru_count(struct list_lru *lru)
 {
@@ -19,9 +18,3 @@ __rust_helper unsigned long rust_helper_list_lru_walk(struct list_lru *lru,
 {
 	return list_lru_walk(lru, isolate, cb_arg, nr_to_walk);
 }
-
-__rust_helper 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/task_work.c b/rust/helpers/task_work.c
new file mode 100644
index 000000000..cb961cd22
--- /dev/null
+++ b/rust/helpers/task_work.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright (C) 2025 Google LLC.
+ */
+
+#include <linux/task_work.h>
+
+__rust_helper void rust_helper_init_task_work(struct callback_head *twork,
+					      task_work_func_t func)
+{
+	init_task_work(twork, func);
+}
-- 
2.34.1