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Commit 11d9684c authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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locking/percpu-rwsem: Add DEFINE_STATIC_PERCPU_RWSEMand percpu_rwsem_assert_held() 



Provide a static init and a standard locking assertion method.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Cc: der.herr@hofr.at
Cc: oleg@redhat.com
Cc: paulmck@linux.vnet.ibm.com
Cc: riel@redhat.com
Cc: tj@kernel.org
Cc: viro@ZenIV.linux.org.uk
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent b1930493

include/linux/percpu-rwsem.h

+12 −0
Original line number Diff line number Diff line
@@ -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 percpu_rw_semaphore *); 


#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)

{