[PATCH 17/28] xarray.h: move declarations to xarray_types.h

[Max Kellermann <max.kellermann@ionos.com>]

By providing declarations in a lean header, we can reduce header
dependencies.

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
---
 include/drm/gpu_scheduler.h  |  2 +-
 include/linux/blkdev.h       |  2 +-
 include/linux/list_lru.h     |  5 ++-
 include/linux/mlx5/driver.h  |  2 +-
 include/linux/msi.h          |  2 +-
 include/linux/xarray.h       | 56 +----------------------------
 include/linux/xarray_types.h | 70 ++++++++++++++++++++++++++++++++++++
 include/net/net_namespace.h  |  2 +-
 include/net/sch_generic.h    |  2 +-
 include/sound/core.h         |  5 ++-
 10 files changed, 85 insertions(+), 63 deletions(-)
 create mode 100644 include/linux/xarray_types.h

diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
index 9a89f72a3bac..f2fb8931cb17 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -27,7 +27,7 @@
 #include <drm/spsc_queue.h>
 #include <linux/dma-fence.h>
 #include <linux/completion_types.h>
-#include <linux/xarray.h>
+#include <linux/xarray_types.h>
 #include <linux/wait_types.h>
 #include <linux/workqueue_types.h>
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3916d2f0a9af..d2c0934a7224 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -23,7 +23,7 @@
 #include <linux/sched.h>
 #include <linux/uio.h> // for iov_iter_is_aligned()
 #include <linux/uuid.h>
-#include <linux/xarray.h>
+#include <linux/xarray_types.h>
 
 struct module;
 struct request_queue;
diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index f2882a820690..bf0b71faa059 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -11,7 +11,10 @@
 #include <linux/list.h>
 #include <linux/nodemask.h>
 #include <linux/shrinker.h>
-#include <linux/xarray.h>
+
+#ifdef CONFIG_MEMCG_KMEM
+#include <linux/xarray_types.h>
+#endif
 
 struct mem_cgroup;
 
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index d9b99aca9e72..07956bd2e55b 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -41,7 +41,7 @@
 #include <linux/semaphore.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
-#include <linux/xarray.h>
+#include <linux/xarray_types.h>
 #include <linux/workqueue_types.h>
 #include <linux/mempool.h>
 #include <linux/interrupt.h>
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 04fd2c856287..a3969b00a793 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -21,7 +21,7 @@
 #include <linux/irqdomain_defs.h>
 #include <linux/cpumask.h>
 #include <linux/msi_api.h>
-#include <linux/xarray.h>
+#include <linux/xarray_types.h>
 #include <linux/mutex_types.h>
 #include <linux/list.h>
 #include <linux/irq.h>
diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index 0983c697648a..aab0539f925d 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -9,10 +9,10 @@
  * See Documentation/core-api/xarray.rst for how to use the XArray.
  */
 
+#include <linux/xarray_types.h>
 #include <linux/bitmap.h>
 #include <linux/bug.h>
 #include <linux/compiler.h>
-#include <linux/gfp_types.h>
 #include <linux/kconfig.h>
 #include <linux/kernel.h>
 #include <linux/rcupdate.h>
@@ -224,37 +224,12 @@ static inline int xa_err(void *entry)
 	return 0;
 }
 
-/**
- * struct xa_limit - Represents a range of IDs.
- * @min: The lowest ID to allocate (inclusive).
- * @max: The maximum ID to allocate (inclusive).
- *
- * This structure is used either directly or via the XA_LIMIT() macro
- * to communicate the range of IDs that are valid for allocation.
- * Three common ranges are predefined for you:
- * * xa_limit_32b	- [0 - UINT_MAX]
- * * xa_limit_31b	- [0 - INT_MAX]
- * * xa_limit_16b	- [0 - USHRT_MAX]
- */
-struct xa_limit {
-	u32 max;
-	u32 min;
-};
-
 #define XA_LIMIT(_min, _max) (struct xa_limit) { .min = _min, .max = _max }
 
 #define xa_limit_32b	XA_LIMIT(0, UINT_MAX)
 #define xa_limit_31b	XA_LIMIT(0, INT_MAX)
 #define xa_limit_16b	XA_LIMIT(0, USHRT_MAX)
 
-typedef unsigned __bitwise xa_mark_t;
-#define XA_MARK_0		((__force xa_mark_t)0U)
-#define XA_MARK_1		((__force xa_mark_t)1U)
-#define XA_MARK_2		((__force xa_mark_t)2U)
-#define XA_PRESENT		((__force xa_mark_t)8U)
-#define XA_MARK_MAX		XA_MARK_2
-#define XA_FREE_MARK		XA_MARK_0
-
 enum xa_lock_type {
 	XA_LOCK_IRQ = 1,
 	XA_LOCK_BH = 2,
@@ -277,35 +252,6 @@ enum xa_lock_type {
 #define XA_FLAGS_ALLOC	(XA_FLAGS_TRACK_FREE | XA_FLAGS_MARK(XA_FREE_MARK))
 #define XA_FLAGS_ALLOC1	(XA_FLAGS_TRACK_FREE | XA_FLAGS_ZERO_BUSY)
 
-/**
- * struct xarray - The anchor of the XArray.
- * @xa_lock: Lock that protects the contents of the XArray.
- *
- * To use the xarray, define it statically or embed it in your data structure.
- * It is a very small data structure, so it does not usually make sense to
- * allocate it separately and keep a pointer to it in your data structure.
- *
- * You may use the xa_lock to protect your own data structures as well.
- */
-/*
- * If all of the entries in the array are NULL, @xa_head is a NULL pointer.
- * If the only non-NULL entry in the array is at index 0, @xa_head is that
- * entry.  If any other entry in the array is non-NULL, @xa_head points
- * to an @xa_node.
- */
-struct xarray {
-	spinlock_t	xa_lock;
-/* private: The rest of the data structure is not to be used directly. */
-	gfp_t		xa_flags;
-	void __rcu *	xa_head;
-};
-
-#define XARRAY_INIT(name, flags) {				\
-	.xa_lock = __SPIN_LOCK_UNLOCKED(name.xa_lock),		\
-	.xa_flags = flags,					\
-	.xa_head = NULL,					\
-}
-
 /**
  * DEFINE_XARRAY_FLAGS() - Define an XArray with custom flags.
  * @name: A string that names your XArray.
diff --git a/include/linux/xarray_types.h b/include/linux/xarray_types.h
new file mode 100644
index 000000000000..ff241ce647a9
--- /dev/null
+++ b/include/linux/xarray_types.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+#ifndef _LINUX_XARRAY_TYPES_H
+#define _LINUX_XARRAY_TYPES_H
+/*
+ * eXtensible Arrays
+ * Copyright (c) 2017 Microsoft Corporation
+ * Author: Matthew Wilcox <willy@infradead.org>
+ *
+ * See Documentation/core-api/xarray.rst for how to use the XArray.
+ */
+
+#include <linux/gfp_types.h>
+#include <linux/spinlock_types.h>
+#include <linux/types.h>
+
+/**
+ * struct xa_limit - Represents a range of IDs.
+ * @min: The lowest ID to allocate (inclusive).
+ * @max: The maximum ID to allocate (inclusive).
+ *
+ * This structure is used either directly or via the XA_LIMIT() macro
+ * to communicate the range of IDs that are valid for allocation.
+ * Three common ranges are predefined for you:
+ * * xa_limit_32b	- [0 - UINT_MAX]
+ * * xa_limit_31b	- [0 - INT_MAX]
+ * * xa_limit_16b	- [0 - USHRT_MAX]
+ */
+struct xa_limit {
+	u32 max;
+	u32 min;
+};
+
+typedef unsigned __bitwise xa_mark_t;
+#define XA_MARK_0		((__force xa_mark_t)0U)
+#define XA_MARK_1		((__force xa_mark_t)1U)
+#define XA_MARK_2		((__force xa_mark_t)2U)
+#define XA_PRESENT		((__force xa_mark_t)8U)
+#define XA_MARK_MAX		XA_MARK_2
+#define XA_FREE_MARK		XA_MARK_0
+
+/**
+ * struct xarray - The anchor of the XArray.
+ * @xa_lock: Lock that protects the contents of the XArray.
+ *
+ * To use the xarray, define it statically or embed it in your data structure.
+ * It is a very small data structure, so it does not usually make sense to
+ * allocate it separately and keep a pointer to it in your data structure.
+ *
+ * You may use the xa_lock to protect your own data structures as well.
+ */
+/*
+ * If all of the entries in the array are NULL, @xa_head is a NULL pointer.
+ * If the only non-NULL entry in the array is at index 0, @xa_head is that
+ * entry.  If any other entry in the array is non-NULL, @xa_head points
+ * to an @xa_node.
+ */
+struct xarray {
+	spinlock_t	xa_lock;
+/* private: The rest of the data structure is not to be used directly. */
+	gfp_t		xa_flags;
+	void __rcu *	xa_head;
+};
+
+#define XARRAY_INIT(name, flags) {				\
+	.xa_lock = __SPIN_LOCK_UNLOCKED(name.xa_lock),		\
+	.xa_flags = flags,					\
+	.xa_head = NULL,					\
+}
+
+#endif /* _LINUX_XARRAY_TYPES_H */
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index a2f221a39cd2..7ffdd8c31151 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -41,7 +41,7 @@
 #include <linux/idr.h>
 #include <linux/skbuff.h>
 #include <linux/notifier.h>
-#include <linux/xarray.h>
+#include <linux/xarray_types.h>
 
 struct user_namespace;
 struct proc_dir_entry;
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 6ec5064156d9..9845ea172382 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -18,7 +18,7 @@
 #include <net/gen_stats.h>
 #include <net/rtnetlink.h>
 #include <net/flow_offload.h>
-#include <linux/xarray.h>
+#include <linux/xarray_types.h>
 
 struct Qdisc_ops;
 struct qdisc_walker;
diff --git a/include/sound/core.h b/include/sound/core.h
index f95f6863986f..7dcba88b2fb7 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -14,7 +14,10 @@
 #include <linux/stringify.h>
 #include <linux/printk.h>
 #include <linux/wait.h>
-#include <linux/xarray.h>
+
+#ifdef CONFIG_SND_CTL_FAST_LOOKUP
+#include <linux/xarray_types.h>
+#endif
 
 /* number of supported soundcards */
 #ifdef CONFIG_SND_DYNAMIC_MINORS
-- 
2.39.2