diff options
Diffstat (limited to 'include/linux/kthread.h')
| -rw-r--r-- | include/linux/kthread.h | 78 |
1 files changed, 72 insertions, 6 deletions
diff --git a/include/linux/kthread.h b/include/linux/kthread.h index b11f53c1ba2e..a01a474719a7 100644 --- a/include/linux/kthread.h +++ b/include/linux/kthread.h @@ -7,6 +7,24 @@ struct mm_struct; +/* opaque kthread data */ +struct kthread; + +/* + * When "(p->flags & PF_KTHREAD)" is set the task is a kthread and will + * always remain a kthread. For kthreads p->worker_private always + * points to a struct kthread. For tasks that are not kthreads + * p->worker_private is used to point to other things. + * + * Return NULL for any task that is not a kthread. + */ +static inline struct kthread *tsk_is_kthread(struct task_struct *p) +{ + if (p->flags & PF_KTHREAD) + return p->worker_private; + return NULL; +} + __printf(4, 5) struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), void *data, @@ -85,6 +103,7 @@ kthread_run_on_cpu(int (*threadfn)(void *data), void *data, void free_kthread_struct(struct task_struct *k); void kthread_bind(struct task_struct *k, unsigned int cpu); void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask); +int kthread_affine_preferred(struct task_struct *p, const struct cpumask *mask); int kthread_stop(struct task_struct *k); int kthread_stop_put(struct task_struct *k); bool kthread_should_stop(void); @@ -97,8 +116,10 @@ void *kthread_probe_data(struct task_struct *k); int kthread_park(struct task_struct *k); void kthread_unpark(struct task_struct *k); void kthread_parkme(void); -void kthread_exit(long result) __noreturn; +#define kthread_exit(result) do_exit(result) void kthread_complete_and_exit(struct completion *, long) __noreturn; +int kthreads_update_housekeeping(void); +void kthread_do_exit(struct kthread *, long); int kthreadd(void *unused); extern struct task_struct *kthreadd_task; @@ -186,13 +207,58 @@ extern void __kthread_init_worker(struct kthread_worker *worker, int kthread_worker_fn(void *worker_ptr); -__printf(2, 3) -struct kthread_worker * -kthread_create_worker(unsigned int flags, const char namefmt[], ...); +__printf(3, 4) +struct kthread_worker *kthread_create_worker_on_node(unsigned int flags, + int node, + const char namefmt[], ...); + +#define kthread_create_worker(flags, namefmt, ...) \ + kthread_create_worker_on_node(flags, NUMA_NO_NODE, namefmt, ## __VA_ARGS__); -__printf(3, 4) struct kthread_worker * +/** + * kthread_run_worker - create and wake a kthread worker. + * @flags: flags modifying the default behavior of the worker + * @namefmt: printf-style name for the thread. + * + * Description: Convenient wrapper for kthread_create_worker() followed by + * wake_up_process(). Returns the kthread_worker or ERR_PTR(-ENOMEM). + */ +#define kthread_run_worker(flags, namefmt, ...) \ +({ \ + struct kthread_worker *__kw \ + = kthread_create_worker(flags, namefmt, ## __VA_ARGS__); \ + if (!IS_ERR(__kw)) \ + wake_up_process(__kw->task); \ + __kw; \ +}) + +struct kthread_worker * kthread_create_worker_on_cpu(int cpu, unsigned int flags, - const char namefmt[], ...); + const char namefmt[]); + +/** + * kthread_run_worker_on_cpu - create and wake a cpu bound kthread worker. + * @cpu: CPU number + * @flags: flags modifying the default behavior of the worker + * @namefmt: printf-style name for the thread. Format is restricted + * to "name.*%u". Code fills in cpu number. + * + * Description: Convenient wrapper for kthread_create_worker_on_cpu() + * followed by wake_up_process(). Returns the kthread_worker or + * ERR_PTR(-ENOMEM). + */ +static inline struct kthread_worker * +kthread_run_worker_on_cpu(int cpu, unsigned int flags, + const char namefmt[]) +{ + struct kthread_worker *kw; + + kw = kthread_create_worker_on_cpu(cpu, flags, namefmt); + if (!IS_ERR(kw)) + wake_up_process(kw->task); + + return kw; +} bool kthread_queue_work(struct kthread_worker *worker, struct kthread_work *work); |