linux-kernel - [PATCH v1 1/1] rculist: move list_for_each

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Message-ID: <20250710121528.780875-1-andriy.shevchenko@linux.intel.com>
Date: Thu, 10 Jul 2025 15:15:28 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christian Brauner <brauner@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Maarten Lankhorst <dev@...khorst.se>,
	Natalie Vock <natalie.vock@....de>,
	linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org,
	cgroups@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang@...ux.dev>,
	Maxime Ripard <mripard@...nel.org>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>
Subject: [PATCH v1 1/1] rculist: move list_for_each_rcu() to where it belongs

The list_for_each_rcu() relies on the rcu_dereference() API which is not
provided by the list.h. At the same time list.h is a low-level basic header
that must not have dependencies like RCU, besides the fact of the potential
circular dependencies in some cases. With all that said, move RCU related
API to the rculist.h where it belongs.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/list.h    | 10 ----------
 include/linux/rculist.h | 10 ++++++++++
 kernel/cgroup/dmem.c    |  1 +
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/linux/list.h b/include/linux/list.h
index e7e28afd28f8..e7bdad9b8618 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -686,16 +686,6 @@ static inline void list_splice_tail_init(struct list_head *list,
 #define list_for_each(pos, head) \
 	for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next)
 
-/**
- * list_for_each_rcu - Iterate over a list in an RCU-safe fashion
- * @pos:	the &struct list_head to use as a loop cursor.
- * @head:	the head for your list.
- */
-#define list_for_each_rcu(pos, head)		  \
-	for (pos = rcu_dereference((head)->next); \
-	     !list_is_head(pos, (head)); \
-	     pos = rcu_dereference(pos->next))
-
 /**
  * list_for_each_continue - continue iteration over a list
  * @pos:	the &struct list_head to use as a loop cursor.
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 1b11926ddd47..2abba7552605 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -42,6 +42,16 @@ static inline void INIT_LIST_HEAD_RCU(struct list_head *list)
  */
 #define list_bidir_prev_rcu(list) (*((struct list_head __rcu **)(&(list)->prev)))
 
+/**
+ * list_for_each_rcu - Iterate over a list in an RCU-safe fashion
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ */
+#define list_for_each_rcu(pos, head)		  \
+	for (pos = rcu_dereference((head)->next); \
+	     !list_is_head(pos, (head)); \
+	     pos = rcu_dereference(pos->next))
+
 /**
  * list_tail_rcu - returns the prev pointer of the head of the list
  * @head: the head of the list
diff --git a/kernel/cgroup/dmem.c b/kernel/cgroup/dmem.c
index 10b63433f057..e12b946278b6 100644
--- a/kernel/cgroup/dmem.c
+++ b/kernel/cgroup/dmem.c
@@ -14,6 +14,7 @@
 #include <linux/mutex.h>
 #include <linux/page_counter.h>
 #include <linux/parser.h>
+#include <linux/rculist.h>
 #include <linux/slab.h>
 
 struct dmem_cgroup_region {
-- 
2.47.2