linux-kernel - [RFC PATCH v3 01/10] rcuwait: Split type definition to its own header

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Message-ID: <20240711130004.2157737-2-vschneid@redhat.com>
Date: Thu, 11 Jul 2024 14:59:55 +0200
From: Valentin Schneider <vschneid@...hat.com>
To: linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org
Cc: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Phil Auld <pauld@...hat.com>,
	Clark Williams <williams@...hat.com>,
	Tomas Glozar <tglozar@...hat.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Guo Ren <guoren@...nel.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Jens Axboe <axboe@...nel.dk>
Subject: [RFC PATCH v3 01/10] rcuwait: Split type definition to its own header

A later commit will add a struct irq_work member to struct task_struct, which
would require <linux/sched.h> to include the definition of struct
irq_work.

Thanks to header dependency hell, incudling <linux/irq_work.h> in <linux/sched.h>
results in defining inline helpers using not-yet-defined fields (mm_struct,
task_struct, various task states...).

Break off the definition of struct rcuwait into its own header file.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
---
 include/linux/rcuwait.h       |  9 ++-------
 include/linux/rcuwait_types.h | 16 ++++++++++++++++
 2 files changed, 18 insertions(+), 7 deletions(-)
 create mode 100644 include/linux/rcuwait_types.h

diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h
index 27343424225cf..1f1ca7d38cdf8 100644
--- a/include/linux/rcuwait.h
+++ b/include/linux/rcuwait.h
@@ -5,17 +5,12 @@
 #include <linux/rcupdate.h>
 #include <linux/sched/signal.h>
 
+#include <linux/rcuwait_types.h>
+
 /*
  * rcuwait provides a way of blocking and waking up a single
  * task in an rcu-safe manner.
- *
- * The only time @task is non-nil is when a user is blocked (or
- * checking if it needs to) on a condition, and reset as soon as we
- * know that the condition has succeeded and are awoken.
  */
-struct rcuwait {
-	struct task_struct __rcu *task;
-};
 
 #define __RCUWAIT_INITIALIZER(name)		\
 	{ .task = NULL, }
diff --git a/include/linux/rcuwait_types.h b/include/linux/rcuwait_types.h
new file mode 100644
index 0000000000000..60a4385a2c368
--- /dev/null
+++ b/include/linux/rcuwait_types.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_RCUWAIT_TYPES_H_
+#define _LINUX_RCUWAIT_TYPES_H_
+
+#include <linux/sched.h>
+
+/*
+ * The only time @task is non-nil is when a user is blocked (or
+ * checking if it needs to) on a condition, and reset as soon as we
+ * know that the condition has succeeded and are awoken.
+ */
+struct rcuwait {
+	struct task_struct __rcu *task;
+};
+
+#endif
-- 
2.43.0