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Groups > linux.kernel > #1476919

[PATCH 1/7] percpu-rwsem: DEFINE_STATIC_PERCPU_RWSEM

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Provide a static init.

Cc: der.herr@hofr.at
Cc: viro@ZenIV.linux.org.uk
Cc: mingo@redhat.com
Cc: torvalds@linux-foundation.org
Cc: dave@stgolabs.net
Cc: oleg@redhat.com
Cc: riel@redhat.com
Cc: tj@kernel.org
Cc: paulmck@linux.vnet.ibm.com
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 include/linux/percpu-rwsem.h |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/include/linux/percpu-rwsem.h
+++ b/include/linux/percpu-rwsem.h
@@ -16,6 +16,15 @@ struct percpu_rw_semaphore {
 	int			readers_block;
 };
 
+#define DEFINE_STATIC_PERCPU_RWSEM(name)				\
+static DEFINE_PER_CPU(unsigned int, __percpu_rwsem_rc_##name);		\
+static struct percpu_rw_semaphore name = {				\
+	.rss = __RCU_SYNC_INITIALIZER(name.rss, RCU_SCHED_SYNC),	\
+	.read_count = &__percpu_rwsem_rc_##name,			\
+	.rw_sem = __RWSEM_INITIALIZER(name.rw_sem),			\
+	.writer = __WAIT_QUEUE_HEAD_INITIALIZER(name.writer),		\
+}
+
 extern int __percpu_down_read(struct percpu_rw_semaphore *, int);
 extern void __percpu_up_read(struct percpu_rw_semaphore *);
 
@@ -102,6 +111,9 @@ extern void percpu_free_rwsem(struct per
 
 #define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem)
 
+#define percpu_rwsem_assert_held(sem)				\
+	lockdep_assert_held(&(sem)->rw_sem)
+
 static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem,
 					bool read, unsigned long ip)
 {

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[PATCH 0/7] perpcu rwsem, fs/locks and killing lglocks Peter Zijlstra <peterz@infradead.org> - 2016-09-05 21:50 +0200
  [PATCH 5/7] fs/locks: Use percpu_down_read_preempt_disable Peter Zijlstra <peterz@infradead.org> - 2016-09-05 21:50 +0200
  [PATCH 6/7] stop_machine: Remove stop_cpus_lock and lg_double_lock/unlock() Peter Zijlstra <peterz@infradead.org> - 2016-09-05 21:50 +0200
  [PATCH 1/7] percpu-rwsem: DEFINE_STATIC_PERCPU_RWSEM Peter Zijlstra <peterz@infradead.org> - 2016-09-05 21:50 +0200
  [PATCH 7/7] locking: Remove lglock Peter Zijlstra <peterz@infradead.org> - 2016-09-05 21:50 +0200
  [PATCH 3/7] fs/locks: Replace lg_local with a per-cpu spinlock Peter Zijlstra <peterz@infradead.org> - 2016-09-05 21:50 +0200
  Re: [PATCH 0/7] perpcu rwsem, fs/locks and killing lglocks Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-09-06 06:50 +0200

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