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35 lines
2.0 KiB
35 lines
2.0 KiB
Prior Operation Subsequent Operation |
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--------------- --------------------------- |
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C Self R W RMW Self R W DR DW RMW SV |
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-- ---- - - --- ---- - - -- -- --- -- |
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Relaxed store Y Y |
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Relaxed load Y Y Y Y |
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Relaxed RMW operation Y Y Y Y |
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rcu_dereference() Y Y Y Y |
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Successful *_acquire() R Y Y Y Y Y Y |
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Successful *_release() C Y Y Y W Y |
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smp_rmb() Y R Y Y R |
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smp_wmb() Y W Y Y W |
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smp_mb() & synchronize_rcu() CP Y Y Y Y Y Y Y Y |
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Successful full non-void RMW CP Y Y Y Y Y Y Y Y Y Y Y |
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smp_mb__before_atomic() CP Y Y Y a a a a Y |
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smp_mb__after_atomic() CP a a Y Y Y Y Y Y |
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Key: Relaxed: A relaxed operation is either READ_ONCE(), WRITE_ONCE(), |
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a *_relaxed() RMW operation, an unsuccessful RMW |
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operation, a non-value-returning RMW operation such |
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as atomic_inc(), or one of the atomic*_read() and |
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atomic*_set() family of operations. |
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C: Ordering is cumulative |
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P: Ordering propagates |
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R: Read, for example, READ_ONCE(), or read portion of RMW |
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W: Write, for example, WRITE_ONCE(), or write portion of RMW |
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Y: Provides ordering |
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a: Provides ordering given intervening RMW atomic operation |
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DR: Dependent read (address dependency) |
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DW: Dependent write (address, data, or control dependency) |
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RMW: Atomic read-modify-write operation |
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SELF: Orders self, as opposed to accesses before and/or after |
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SV: Orders later accesses to the same variable
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