[PATCH v4 09/35] rwsem.h: move declarations to rwsem_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/linux/backing-dev-defs.h  |  2 +-
 include/linux/comedi/comedidev.h  |  2 +-
 include/linux/gnss.h              |  2 +-
 include/linux/i3c/master.h        |  2 +-
 include/linux/ipc_namespace.h     |  2 +-
 include/linux/leds.h              |  2 +-
 include/linux/mfd/intel-m10-bmc.h |  2 +-
 include/linux/mm_types.h          |  2 +-
 include/linux/nfs_fs.h            |  2 +-
 include/linux/posix-clock.h       |  2 +-
 include/linux/quota.h             |  2 +-
 include/linux/rwsem.h             | 48 +------------------
 include/linux/rwsem_types.h       | 78 +++++++++++++++++++++++++++++++
 include/linux/tty.h               |  2 +-
 include/linux/user_namespace.h    |  2 +-
 include/net/sch_generic.h         |  2 +-
 include/rdma/ib_verbs.h           |  2 +-
 include/sound/core.h              |  2 +-
 18 files changed, 95 insertions(+), 63 deletions(-)
 create mode 100644 include/linux/rwsem_types.h

diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index b379687434fa..68fdec049456 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -15,7 +15,7 @@
 #include <linux/kref_types.h>
 
 #ifdef CONFIG_CGROUP_WRITEBACK
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #endif
 
 struct page;
diff --git a/include/linux/comedi/comedidev.h b/include/linux/comedi/comedidev.h
index d7a75b15c6f7..a3c2268f7ae5 100644
--- a/include/linux/comedi/comedidev.h
+++ b/include/linux/comedi/comedidev.h
@@ -13,7 +13,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/mutex_types.h>
 #include <linux/spinlock_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/kref_types.h>
 #include <linux/comedi.h>
 
diff --git a/include/linux/gnss.h b/include/linux/gnss.h
index 8fc4bdd38dc6..9f38ff948d78 100644
--- a/include/linux/gnss.h
+++ b/include/linux/gnss.h
@@ -12,7 +12,7 @@
 #include <linux/device.h>
 #include <linux/kfifo.h>
 #include <linux/mutex_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/types.h>
 #include <linux/wait.h>
 
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index 16cc81e55b12..0e456edeebbf 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -14,7 +14,7 @@
 #include <linux/i2c.h>
 #include <linux/i3c/ccc.h>
 #include <linux/i3c/device.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/workqueue_types.h>
 
 #define I3C_HOT_JOIN_ADDR		0x2
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index e8240cf2611a..a0011b6cd5d1 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -4,7 +4,7 @@
 
 #include <linux/err.h>
 #include <linux/idr.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/notifier.h>
 #include <linux/nsproxy.h>
 #include <linux/ns_common.h>
diff --git a/include/linux/leds.h b/include/linux/leds.h
index bec1c2fa5b26..6a50c2ea10e2 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -11,7 +11,7 @@
 #include <dt-bindings/leds/common.h>
 #include <linux/device.h>
 #include <linux/mutex_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/spinlock_types.h>
 #include <linux/timer_types.h>
 #include <linux/types.h>
diff --git a/include/linux/mfd/intel-m10-bmc.h b/include/linux/mfd/intel-m10-bmc.h
index ee66c9751003..3500f5fa8057 100644
--- a/include/linux/mfd/intel-m10-bmc.h
+++ b/include/linux/mfd/intel-m10-bmc.h
@@ -11,7 +11,7 @@
 #include <linux/bits.h>
 #include <linux/dev_printk.h>
 #include <linux/regmap.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 
 #define M10BMC_N3000_LEGACY_BUILD_VER	0x300468
 #define M10BMC_N3000_SYS_BASE		0x300800
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index ff5d33ace0f9..ed764511bc23 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -12,7 +12,7 @@
 #include <linux/spinlock_types.h>
 #include <linux/rbtree_types.h>
 #include <linux/maple_tree_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/cpumask.h>
 #include <linux/uprobes.h>
 #include <linux/rcupdate.h>
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 4511d8a50e15..8f14fce5d7e2 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -24,7 +24,7 @@
 #include <linux/pagemap.h>
 #include <linux/rbtree_types.h>
 #include <linux/refcount_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 
 #include <linux/sunrpc/debug.h>
 #include <linux/sunrpc/auth.h>
diff --git a/include/linux/posix-clock.h b/include/linux/posix-clock.h
index ef8619f48920..f8e0c65d262d 100644
--- a/include/linux/posix-clock.h
+++ b/include/linux/posix-clock.h
@@ -11,7 +11,7 @@
 #include <linux/fs.h>
 #include <linux/poll.h>
 #include <linux/posix-timers.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 
 struct posix_clock;
 struct posix_clock_context;
diff --git a/include/linux/quota.h b/include/linux/quota.h
index bf16d9d2866c..956281c84850 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -34,7 +34,7 @@
 
 #include <linux/list.h>
 #include <linux/mutex_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/spinlock_types.h>
 #include <linux/percpu_counter.h>
 
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 9c29689ff505..ba9532734bf6 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -8,10 +8,10 @@
 #ifndef _LINUX_RWSEM_H
 #define _LINUX_RWSEM_H
 
+#include <linux/rwsem_types.h>
 #include <linux/linkage.h>
 
 #include <linux/types.h>
-#include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/atomic.h>
 #include <linux/err.h>
@@ -29,43 +29,6 @@
 
 #ifndef CONFIG_PREEMPT_RT
 
-#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
-#include <linux/osq_lock.h>
-#endif
-
-/*
- * For an uncontended rwsem, count and owner are the only fields a task
- * needs to touch when acquiring the rwsem. So they are put next to each
- * other to increase the chance that they will share the same cacheline.
- *
- * In a contended rwsem, the owner is likely the most frequently accessed
- * field in the structure as the optimistic waiter that holds the osq lock
- * will spin on owner. For an embedded rwsem, other hot fields in the
- * containing structure should be moved further away from the rwsem to
- * reduce the chance that they will share the same cacheline causing
- * cacheline bouncing problem.
- */
-struct rw_semaphore {
-	atomic_long_t count;
-	/*
-	 * Write owner or one of the read owners as well flags regarding
-	 * the current state of the rwsem. Can be used as a speculative
-	 * check to see if the write owner is running on the cpu.
-	 */
-	atomic_long_t owner;
-#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
-	struct optimistic_spin_queue osq; /* spinner MCS lock */
-#endif
-	raw_spinlock_t wait_lock;
-	struct list_head wait_list;
-#ifdef CONFIG_DEBUG_RWSEMS
-	void *magic;
-#endif
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-	struct lockdep_map	dep_map;
-#endif
-};
-
 /* In all implementations count != 0 means locked */
 static inline int rwsem_is_locked(struct rw_semaphore *sem)
 {
@@ -124,15 +87,6 @@ static inline int rwsem_is_contended(struct rw_semaphore *sem)
 
 #else /* !CONFIG_PREEMPT_RT */
 
-#include <linux/rwbase_rt.h>
-
-struct rw_semaphore {
-	struct rwbase_rt	rwbase;
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-	struct lockdep_map	dep_map;
-#endif
-};
-
 #define __RWSEM_INITIALIZER(name)				\
 	{							\
 		.rwbase = __RWBASE_INITIALIZER(name),		\
diff --git a/include/linux/rwsem_types.h b/include/linux/rwsem_types.h
new file mode 100644
index 000000000000..105142147b9b
--- /dev/null
+++ b/include/linux/rwsem_types.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* rwsem.h: R/W semaphores, public interface
+ *
+ * Written by David Howells (dhowells@redhat.com).
+ * Derived from asm-i386/semaphore.h
+ */
+
+#ifndef _LINUX_RWSEM_TYPES_H
+#define _LINUX_RWSEM_TYPES_H
+
+#include <linux/list.h>
+#include <linux/spinlock_types.h>
+#include <linux/atomic.h>
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+#include <linux/lockdep_types.h>
+# define __RWSEM_DEP_MAP_INIT(lockname)			\
+	.dep_map = {					\
+		.name = #lockname,			\
+		.wait_type_inner = LD_WAIT_SLEEP,	\
+	},
+#else
+# define __RWSEM_DEP_MAP_INIT(lockname)
+#endif
+
+#ifndef CONFIG_PREEMPT_RT
+
+#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
+#include <linux/osq_lock.h>
+#endif
+
+/*
+ * For an uncontended rwsem, count and owner are the only fields a task
+ * needs to touch when acquiring the rwsem. So they are put next to each
+ * other to increase the chance that they will share the same cacheline.
+ *
+ * In a contended rwsem, the owner is likely the most frequently accessed
+ * field in the structure as the optimistic waiter that holds the osq lock
+ * will spin on owner. For an embedded rwsem, other hot fields in the
+ * containing structure should be moved further away from the rwsem to
+ * reduce the chance that they will share the same cacheline causing
+ * cacheline bouncing problem.
+ */
+struct rw_semaphore {
+	atomic_long_t count;
+	/*
+	 * Write owner or one of the read owners as well flags regarding
+	 * the current state of the rwsem. Can be used as a speculative
+	 * check to see if the write owner is running on the cpu.
+	 */
+	atomic_long_t owner;
+#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
+	struct optimistic_spin_queue osq; /* spinner MCS lock */
+#endif
+	raw_spinlock_t wait_lock;
+	struct list_head wait_list;
+#ifdef CONFIG_DEBUG_RWSEMS
+	void *magic;
+#endif
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	struct lockdep_map	dep_map;
+#endif
+};
+
+#else /* !CONFIG_PREEMPT_RT */
+
+#include <linux/rwbase_rt.h>
+
+struct rw_semaphore {
+	struct rwbase_rt	rwbase;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	struct lockdep_map	dep_map;
+#endif
+};
+
+#endif /* CONFIG_PREEMPT_RT */
+
+#endif /* _LINUX_RWSEM_TYPES_H */
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 5a3815e7d73d..da820609bc77 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -13,7 +13,7 @@
 #include <linux/mutex_types.h>
 #include <linux/tty_flags.h>
 #include <uapi/linux/tty.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/llist.h>
 
 
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 7d0e3418d497..c82e1b50dfcb 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -6,7 +6,7 @@
 #include <linux/ns_common.h>
 #include <linux/sched.h>
 #include <linux/workqueue_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/sysctl.h>
 #include <linux/err.h>
 
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index bab44a435a62..6ec5064156d9 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -12,7 +12,7 @@
 #include <linux/list.h>
 #include <linux/refcount.h>
 #include <linux/mutex_types.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/atomic.h>
 #include <linux/hashtable.h>
 #include <net/gen_stats.h>
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 64b62d1388a4..7d6216e85b0e 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -18,7 +18,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/kref_types.h>
 #include <linux/list.h>
-#include <linux/rwsem.h>
+#include <linux/rwsem_types.h>
 #include <linux/workqueue_types.h>
 #include <linux/irq_poll.h>
 #include <uapi/linux/if_ether.h>
diff --git a/include/sound/core.h b/include/sound/core.h
index 0c512acac050..f95f6863986f 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -10,7 +10,7 @@
 #include <linux/device.h>
 #include <linux/sched.h>		/* wake_up() */
 #include <linux/mutex_types.h>		/* struct mutex */
-#include <linux/rwsem.h>		/* struct rw_semaphore */
+#include <linux/rwsem_types.h>		/* struct rw_semaphore */
 #include <linux/stringify.h>
 #include <linux/printk.h>
 #include <linux/wait.h>
-- 
2.39.2