projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c27b644 PM |
1 | Prior Operation Subsequent Operation |
| 2 | --------------- --------------------------- | |
| a8391951 | 3 | C Self R W RMW Self R W DR DW RMW SV |
| bd5c0ba2 | 4 | -- ---- - - --- ---- - - -- -- --- -- |
| 1c27b644 PM |
5 | |
| 6 | Store, e.g., WRITE_ONCE() Y Y | |
| bd5c0ba2 AS |
7 | Load, e.g., READ_ONCE() Y Y Y Y |
| 8 | Unsuccessful RMW operation Y Y Y Y | |
| bf28ae56 | 9 | rcu_dereference() Y Y Y Y |
| 1c27b644 PM |
10 | Successful *_acquire() R Y Y Y Y Y Y |
| 11 | Successful *_release() C Y Y Y W Y | |
| 12 | smp_rmb() Y R Y Y R | |
| 13 | smp_wmb() Y W Y Y W | |
| 14 | smp_mb() & synchronize_rcu() CP Y Y Y Y Y Y Y Y | |
| 15 | Successful full non-void RMW CP Y Y Y Y Y Y Y Y Y Y Y | |
| 16 | smp_mb__before_atomic() CP Y Y Y a a a a Y | |
| bfd403bb | 17 | smp_mb__after_atomic() CP a a Y Y Y Y Y Y |
| 1c27b644 PM |
18 | |
| 19 | ||
| 20 | Key: C: Ordering is cumulative | |
| 21 | P: Ordering propagates | |
| 22 | R: Read, for example, READ_ONCE(), or read portion of RMW | |
| 23 | W: Write, for example, WRITE_ONCE(), or write portion of RMW | |
| 24 | Y: Provides ordering | |
| 25 | a: Provides ordering given intervening RMW atomic operation | |
| 26 | DR: Dependent read (address dependency) | |
| 27 | DW: Dependent write (address, data, or control dependency) | |
| 28 | RMW: Atomic read-modify-write operation | |
| 35bb6ee6 PM |
29 | SELF: Orders self, as opposed to accesses before and/or after |
| 30 | SV: Orders later accesses to the same variable |