A work is linked to the next one by having WORK_STRUCT_LINKED bit set and these links can be chained. When a linked work is dispatched to a worker, all linked works are dispatched to the worker's newly added ->scheduled queue and processed back-to-back. Currently, as there's only single worker per cwq, having linked works doesn't make any visible behavior difference. This change is to prepare for multiple shared workers per cpu.
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| @@ -24,8 +24,9 @@ typedef void (*work_func_t)(struct work_struct *work); · 23 unmodified lines | ||
| 24 | 24 | |
| 25 | 25 | enum { |
| 26 | 26 | WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */ |
| 27 | + WORK_STRUCT_LINKED_BIT = 1, /* next work is linked to this one */ | |
| 27 | 28 | #ifdef CONFIG_DEBUG_OBJECTS_WORK |
| 28 | − WORK_STRUCT_STATIC_BIT = 1, /* static initializer (debugobjects) */ | |
| 29 | + WORK_STRUCT_STATIC_BIT = 2, /* static initializer (debugobjects) */ | |
| 29 | 30 | WORK_STRUCT_COLOR_SHIFT = 3, /* color for workqueue flushing */ |
| 30 | 31 | #else |
| 31 | 32 | WORK_STRUCT_COLOR_SHIFT = 2, /* color for workqueue flushing */ |
| @@ -34,6 +35,7 @@ enum { · 2 unmodified lines | ||
| 34 | 35 | WORK_STRUCT_COLOR_BITS = 4, |
| 35 | 36 | |
| 36 | 37 | WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT, |
| 38 | + WORK_STRUCT_LINKED = 1 << WORK_STRUCT_LINKED_BIT, | |
| 37 | 39 | #ifdef CONFIG_DEBUG_OBJECTS_WORK |
| 38 | 40 | WORK_STRUCT_STATIC = 1 << WORK_STRUCT_STATIC_BIT, |
| 39 | 41 | #else |