linux-kernel - [PATCH 39/50] refcount: Split out refcount

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Message-ID: <20231216033300.3553457-7-kent.overstreet@linux.dev>
Date: Fri, 15 Dec 2023 22:32:45 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Cc: Kent Overstreet <kent.overstreet@...ux.dev>,
	tglx@...utronix.de,
	x86@...nel.org,
	tj@...nel.org,
	peterz@...radead.org,
	mathieu.desnoyers@...icios.com,
	paulmck@...nel.org,
	keescook@...omium.org,
	dave.hansen@...ux.intel.com,
	mingo@...hat.com,
	will@...nel.org,
	longman@...hat.com,
	boqun.feng@...il.com,
	brauner@...nel.org
Subject: [PATCH 39/50] refcount: Split out refcount_types.h

More trimming of sched.h dependencies.

Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
---
 include/linux/refcount.h       | 13 +------------
 include/linux/refcount_types.h | 19 +++++++++++++++++++
 include/linux/sched.h          |  2 +-
 3 files changed, 21 insertions(+), 13 deletions(-)
 create mode 100644 include/linux/refcount_types.h

diff --git a/include/linux/refcount.h b/include/linux/refcount.h
index a62fcca97486..85c6df0d1bef 100644
--- a/include/linux/refcount.h
+++ b/include/linux/refcount.h
@@ -96,22 +96,11 @@
 #include <linux/bug.h>
 #include <linux/compiler.h>
 #include <linux/limits.h>
+#include <linux/refcount_types.h>
 #include <linux/spinlock_types.h>
 
 struct mutex;
 
-/**
- * typedef refcount_t - variant of atomic_t specialized for reference counts
- * @refs: atomic_t counter field
- *
- * The counter saturates at REFCOUNT_SATURATED and will not move once
- * there. This avoids wrapping the counter and causing 'spurious'
- * use-after-free bugs.
- */
-typedef struct refcount_struct {
-	atomic_t refs;
-} refcount_t;
-
 #define REFCOUNT_INIT(n)	{ .refs = ATOMIC_INIT(n), }
 #define REFCOUNT_MAX		INT_MAX
 #define REFCOUNT_SATURATED	(INT_MIN / 2)
diff --git a/include/linux/refcount_types.h b/include/linux/refcount_types.h
new file mode 100644
index 000000000000..162004f06edf
--- /dev/null
+++ b/include/linux/refcount_types.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_REFCOUNT_TYPES_H
+#define _LINUX_REFCOUNT_TYPES_H
+
+#include <linux/types.h>
+
+/**
+ * typedef refcount_t - variant of atomic_t specialized for reference counts
+ * @refs: atomic_t counter field
+ *
+ * The counter saturates at REFCOUNT_SATURATED and will not move once
+ * there. This avoids wrapping the counter and causing 'spurious'
+ * use-after-free bugs.
+ */
+typedef struct refcount_struct {
+	atomic_t refs;
+} refcount_t;
+
+#endif /* _LINUX_REFCOUNT_TYPES_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index fea6d913e004..f52977af1511 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -22,7 +22,7 @@
 #include <linux/seccomp.h>
 #include <linux/nodemask_types.h>
 #include <linux/rcupdate.h>
-#include <linux/refcount.h>
+#include <linux/refcount_types.h>
 #include <linux/resource.h>
 #include <linux/latencytop.h>
 #include <linux/sched/prio.h>
-- 
2.43.0