.. | .. |
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3 | 3 | C Self R W RMW Self R W DR DW RMW SV |
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4 | 4 | -- ---- - - --- ---- - - -- -- --- -- |
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5 | 5 | |
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6 | | -Store, e.g., WRITE_ONCE() Y Y |
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7 | | -Load, e.g., READ_ONCE() Y Y Y Y |
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8 | | -Unsuccessful RMW operation Y Y Y Y |
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| 6 | +Relaxed store Y Y |
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| 7 | +Relaxed load Y Y Y Y |
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| 8 | +Relaxed RMW operation Y Y Y Y |
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9 | 9 | rcu_dereference() Y Y Y Y |
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10 | 10 | Successful *_acquire() R Y Y Y Y Y Y |
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11 | 11 | Successful *_release() C Y Y Y W Y |
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.. | .. |
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17 | 17 | smp_mb__after_atomic() CP a a Y Y Y Y Y Y |
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18 | 18 | |
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19 | 19 | |
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20 | | -Key: C: Ordering is cumulative |
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21 | | - P: Ordering propagates |
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22 | | - R: Read, for example, READ_ONCE(), or read portion of RMW |
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23 | | - W: Write, for example, WRITE_ONCE(), or write portion of RMW |
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24 | | - Y: Provides ordering |
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25 | | - a: Provides ordering given intervening RMW atomic operation |
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26 | | - DR: Dependent read (address dependency) |
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27 | | - DW: Dependent write (address, data, or control dependency) |
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28 | | - RMW: Atomic read-modify-write operation |
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29 | | - SELF: Orders self, as opposed to accesses before and/or after |
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30 | | - SV: Orders later accesses to the same variable |
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| 20 | +Key: Relaxed: A relaxed operation is either READ_ONCE(), WRITE_ONCE(), |
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| 21 | + a *_relaxed() RMW operation, an unsuccessful RMW |
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| 22 | + operation, a non-value-returning RMW operation such |
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| 23 | + as atomic_inc(), or one of the atomic*_read() and |
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| 24 | + atomic*_set() family of operations. |
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| 25 | + C: Ordering is cumulative |
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| 26 | + P: Ordering propagates |
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| 27 | + R: Read, for example, READ_ONCE(), or read portion of RMW |
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| 28 | + W: Write, for example, WRITE_ONCE(), or write portion of RMW |
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| 29 | + Y: Provides ordering |
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| 30 | + a: Provides ordering given intervening RMW atomic operation |
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| 31 | + DR: Dependent read (address dependency) |
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| 32 | + DW: Dependent write (address, data, or control dependency) |
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| 33 | + RMW: Atomic read-modify-write operation |
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| 34 | + SELF: Orders self, as opposed to accesses before and/or after |
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| 35 | + SV: Orders later accesses to the same variable |
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