From ddb6c9b58a19edcfac93ac670b066c836ff729f1 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 24 Feb 2010 09:54:54 +0100 Subject: locking, rwsem: Annotate inner lock as raw There is no reason to allow the lock protecting rwsems (the ownerless variant) to be preemptible on -rt. Convert it to raw. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- lib/rwsem.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'lib/rwsem.c') diff --git a/lib/rwsem.c b/lib/rwsem.c index aa7c3052261f..410aa1189b13 100644 --- a/lib/rwsem.c +++ b/lib/rwsem.c @@ -22,7 +22,7 @@ void __init_rwsem(struct rw_semaphore *sem, const char *name, lockdep_init_map(&sem->dep_map, name, key, 0); #endif sem->count = RWSEM_UNLOCKED_VALUE; - spin_lock_init(&sem->wait_lock); + raw_spin_lock_init(&sem->wait_lock); INIT_LIST_HEAD(&sem->wait_list); } @@ -180,7 +180,7 @@ rwsem_down_failed_common(struct rw_semaphore *sem, set_task_state(tsk, TASK_UNINTERRUPTIBLE); /* set up my own style of waitqueue */ - spin_lock_irq(&sem->wait_lock); + raw_spin_lock_irq(&sem->wait_lock); waiter.task = tsk; waiter.flags = flags; get_task_struct(tsk); @@ -204,7 +204,7 @@ rwsem_down_failed_common(struct rw_semaphore *sem, adjustment == -RWSEM_ACTIVE_WRITE_BIAS) sem = __rwsem_do_wake(sem, RWSEM_WAKE_READ_OWNED); - spin_unlock_irq(&sem->wait_lock); + raw_spin_unlock_irq(&sem->wait_lock); /* wait to be given the lock */ for (;;) { @@ -245,13 +245,13 @@ struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem) { unsigned long flags; - spin_lock_irqsave(&sem->wait_lock, flags); + raw_spin_lock_irqsave(&sem->wait_lock, flags); /* do nothing if list empty */ if (!list_empty(&sem->wait_list)) sem = __rwsem_do_wake(sem, RWSEM_WAKE_ANY); - spin_unlock_irqrestore(&sem->wait_lock, flags); + raw_spin_unlock_irqrestore(&sem->wait_lock, flags); return sem; } @@ -265,13 +265,13 @@ struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem) { unsigned long flags; - spin_lock_irqsave(&sem->wait_lock, flags); + raw_spin_lock_irqsave(&sem->wait_lock, flags); /* do nothing if list empty */ if (!list_empty(&sem->wait_list)) sem = __rwsem_do_wake(sem, RWSEM_WAKE_READ_OWNED); - spin_unlock_irqrestore(&sem->wait_lock, flags); + raw_spin_unlock_irqrestore(&sem->wait_lock, flags); return sem; } -- cgit v1.2.3