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On Linux atomic_dec_and_lock_irqsave is a wrapper macro which provides a reference to third parameter rather than parameter value itself to implementation routine called _atomic_dec_and_lock_irqsave [1]. While here, implement a fast path. [1] https://github.com/torvalds/linux/blob/master/include/linux/spinlock.h#L476 Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D30781 |
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