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 | 5 | |
| 0ce0c78e PM |
6 | Relaxed store Y Y |
| 7 | Relaxed load Y Y Y Y | |
| 8 | Relaxed 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 | ||
| 0ce0c78e PM |
20 | Key: Relaxed: A relaxed operation is either READ_ONCE(), WRITE_ONCE(), |
| 21 | a *_relaxed() RMW operation, an unsuccessful RMW | |
| 22 | operation, a non-value-returning RMW operation such | |
| 23 | as atomic_inc(), or one of the atomic*_read() and | |
| 24 | atomic*_set() family of operations. | |
| 25 | C: Ordering is cumulative | |
| 26 | P: Ordering propagates | |
| 27 | R: Read, for example, READ_ONCE(), or read portion of RMW | |
| 28 | W: Write, for example, WRITE_ONCE(), or write portion of RMW | |
| 29 | Y: Provides ordering | |
| 30 | a: Provides ordering given intervening RMW atomic operation | |
| 31 | DR: Dependent read (address dependency) | |
| 32 | DW: Dependent write (address, data, or control dependency) | |
| 33 | RMW: Atomic read-modify-write operation | |
| 34 | SELF: Orders self, as opposed to accesses before and/or after | |
| 35 | SV: Orders later accesses to the same variable |