Add wq_barrier->task and worker_pool->manager to keep track of the flushing task and pool manager respectively. These are purely informational and will be used to implement sysrq dump of workqueues.
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| @@ -159,6 +159,7 @@ struct worker_pool { · 158 unmodified lines | ||
| 159 | 159 | |
| 160 | 160 | /* see manage_workers() for details on the two manager mutexes */ |
| 161 | 161 | struct mutex manager_arb; /* manager arbitration */ |
| 162 | + struct worker *manager; /* L: purely informational */ | |
| 162 | 163 | struct mutex attach_mutex; /* attach/detach exclusion */ |
| 163 | 164 | struct list_head workers; /* A: attached workers */ |
| 164 | 165 | struct completion *detach_completion; /* all workers detached */ |
| @@ -1918,9 +1919,11 @@ static bool manage_workers(struct worker *worker) · 1753 unmodified lines | ||
| 1918 | 1919 | */ |
| 1919 | 1920 | if (!mutex_trylock(&pool->manager_arb)) |
| 1920 | 1921 | return false; |
| 1922 | + pool->manager = worker; | |
| 1921 | 1923 | |
| 1922 | 1924 | maybe_create_worker(pool); |
| 1923 | 1925 | |
| 1926 | + pool->manager = NULL; | |
| 1924 | 1927 | mutex_unlock(&pool->manager_arb); |
| 1925 | 1928 | return true; |
| 1926 | 1929 | } |
| @@ -2310,6 +2313,7 @@ repeat: · 383 unmodified lines | ||
| 2310 | 2313 | struct wq_barrier { |
| 2311 | 2314 | struct work_struct work; |
| 2312 | 2315 | struct completion done; |
| 2316 | + struct task_struct *task; /* purely informational */ | |
| 2313 | 2317 | }; |
| 2314 | 2318 | |
| 2315 | 2319 | static void wq_barrier_func(struct work_struct *work) |
| @@ -2358,6 +2362,7 @@ static void insert_wq_barrier(struct pool_workqueue *pwq, · 42 unmodified lines | ||
| 2358 | 2362 | INIT_WORK_ONSTACK(&barr->work, wq_barrier_func); |
| 2359 | 2363 | __set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&barr->work)); |
| 2360 | 2364 | init_completion(&barr->done); |
| 2365 | + barr->task = current; | |
| 2361 | 2366 | |
| 2362 | 2367 | /* |
| 2363 | 2368 | * If @target is currently being executed, schedule the |