Messages in this thread Patch in this message | | | Date | Mon, 22 Jun 2015 14:16:31 +0200 | From | Peter Zijlstra <> | Subject | [RFC][PATCH 08/13] percpu-rwsem: DEFINE_STATIC_PERCPU_RWSEM |
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Provide a static init
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- include/linux/percpu-rwsem.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
--- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -16,6 +16,19 @@ struct percpu_rw_semaphore { struct rw_semaphore rw_sem; }; +#define DEFINE_STATIC_PERCPU_RWSEM(name) \ +static DEFINE_PER_CPU(unsigned int, __percpu_rwsem_refcount_##name); \ +static struct percpu_rw_semaphore name = { \ + .refcount = &__percpu_rwsem_refcount_##name, \ + .state = 0, \ + .rss = __RCU_SYNC_INITIALIZER(name.rss, RCU_SCHED_SYNC), \ + .writer = __WAIT_QUEUE_HEAD_INITIALIZER(name.writer), \ + .rw_sem = __RWSEM_INITIALIZER(name.rw_sem), \ +} + +#define lockdep_assert_held_percpu_rwsem(sem) \ + lockdep_assert_held(&(sem)->rw_sem) + extern void __percpu_down_read(struct percpu_rw_semaphore *); extern bool __percpu_down_read_trylock(struct percpu_rw_semaphore *); extern void __percpu_up_read(struct percpu_rw_semaphore *);
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