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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Jason Low
4d9d951e6b
Currently, we initialize the osq lock by directly setting the lock's values. It would be preferable if we use an init macro to do the initialization like we do with other locks. This patch introduces and uses a macro and function for initializing the osq lock. Signed-off-by: Jason Low <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Cc: Scott Norton <[email protected]> Cc: "Paul E. McKenney" <[email protected]> Cc: Dave Chinner <[email protected]> Cc: Waiman Long <[email protected]> Cc: Davidlohr Bueso <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Andrew Morton <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Tim Chen <[email protected]> Cc: Konrad Rzeszutek Wilk <[email protected]> Cc: Aswin Chandramouleeswaran <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Chris Mason <[email protected]> Cc: Josef Bacik <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
28 lines
626 B
C
28 lines
626 B
C
#ifndef __LINUX_OSQ_LOCK_H
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#define __LINUX_OSQ_LOCK_H
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/*
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* An MCS like lock especially tailored for optimistic spinning for sleeping
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* lock implementations (mutex, rwsem, etc).
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*/
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#define OSQ_UNLOCKED_VAL (0)
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struct optimistic_spin_queue {
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/*
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* Stores an encoded value of the CPU # of the tail node in the queue.
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* If the queue is empty, then it's set to OSQ_UNLOCKED_VAL.
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*/
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atomic_t tail;
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};
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/* Init macro and function. */
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#define OSQ_LOCK_UNLOCKED { ATOMIC_INIT(OSQ_UNLOCKED_VAL) }
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static inline void osq_lock_init(struct optimistic_spin_queue *lock)
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{
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atomic_set(&lock->tail, OSQ_UNLOCKED_VAL);
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}
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#endif
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