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seq_write_begin(), instead of the load_rmb/rbm_load functions. The update does not need to be atomic due to the write lock owned. Similarly, in seq_write_end(), update of *seqp needs not be atomic. Only store must be atomic with release. For seq_read(), the natural operation is the load acquire of the sequence value, express this directly with atomic_load_acq_int() instead of using custom partial fence implementation atomic_load_rmb_int(). In seq_consistent, use atomic_thread_fence_acq() which provides the desired semantic of ordering reads before fence before the re-reading of *seqp, instead of custom atomic_rmb_load_int(). Reviewed by: alc, bde Sponsored by: The FreeBSD Foundation MFC after: 3 weeks
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