Pull RCU updates from Paul E. McKenney: - Removal of spin_unlock_wait() - SRCU updates - Torture-test updates - Documentation updates - Miscellaneous fixes - CPU-hotplug fixes - Miscellaneous non-RCU fixes
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| @@ -40,14 +40,33 @@ · 39 unmodified lines | ||
| 40 | 40 | * (non-running threads are de facto in such a |
| 41 | 41 | * state). This covers threads from all processes |
| 42 | 42 | * running on the system. This command returns 0. |
| 43 | + * @MEMBARRIER_CMD_PRIVATE_EXPEDITED: | |
| 44 | + * Execute a memory barrier on each running | |
| 45 | + * thread belonging to the same process as the current | |
| 46 | + * thread. Upon return from system call, the | |
| 47 | + * caller thread is ensured that all its running | |
| 48 | + * threads siblings have passed through a state | |
| 49 | + * where all memory accesses to user-space | |
| 50 | + * addresses match program order between entry | |
| 51 | + * to and return from the system call | |
| 52 | + * (non-running threads are de facto in such a | |
| 53 | + * state). This only covers threads from the | |
| 54 | + * same processes as the caller thread. This | |
| 55 | + * command returns 0. The "expedited" commands | |
| 56 | + * complete faster than the non-expedited ones, | |
| 57 | + * they never block, but have the downside of | |
| 58 | + * causing extra overhead. | |
| 43 | 59 | * |
| 44 | 60 | * Command to be passed to the membarrier system call. The commands need to |
| 45 | 61 | * be a single bit each, except for MEMBARRIER_CMD_QUERY which is assigned to |
| 46 | 62 | * the value 0. |
| 47 | 63 | */ |
| 48 | 64 | enum membarrier_cmd { |
| 49 | − MEMBARRIER_CMD_QUERY = 0, | |
| 50 | − MEMBARRIER_CMD_SHARED = (1 << 0), | |
| 65 | + MEMBARRIER_CMD_QUERY = 0, | |
| 66 | + MEMBARRIER_CMD_SHARED = (1 << 0), | |
| 67 | + /* reserved for MEMBARRIER_CMD_SHARED_EXPEDITED (1 << 1) */ | |
| 68 | + /* reserved for MEMBARRIER_CMD_PRIVATE (1 << 2) */ | |
| 69 | + MEMBARRIER_CMD_PRIVATE_EXPEDITED = (1 << 3), | |
| 51 | 70 | }; |
| 52 | 71 | |
| 53 | 72 | #endif /* _UAPI_LINUX_MEMBARRIER_H */ |