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treewide: Introduce kthread_run_worker[_on_cpu]()

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kthread_create() creates a kthread without running it yet. kthread_run()
creates a kthread and runs it.

On the other hand, kthread_create_worker() creates a kthread worker and
runs it.

This difference in behaviours is confusing. Also there is no way to
create a kthread worker and affine it using kthread_bind_mask() or
kthread_affine_preferred() before starting it.

Consolidate the behaviours and introduce kthread_run_worker[_on_cpu]()
that behaves just like kthread_run(). kthread_create_worker[_on_cpu]()
will now only create a kthread worker without starting it.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
This commit is contained in:
Frederic Weisbecker
2024-09-27 00:49:07 +02:00
parent 41f70d8e16
commit b04e317b52
33 changed files with 83 additions and 66 deletions
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48
include/linux/kthread.h
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@@ -193,19 +193,53 @@ struct kthread_worker *kthread_create_worker_on_node(unsigned int flags,
const char namefmt[], ...);
#define kthread_create_worker(flags, namefmt, ...) \
({ \
struct kthread_worker *__kw \
= kthread_create_worker_on_node(flags, NUMA_NO_NODE, \
namefmt, ## __VA_ARGS__); \
if (!IS_ERR(__kw)) \
wake_up_process(__kw->task); \
__kw; \
kthread_create_worker_on_node(flags, NUMA_NO_NODE, namefmt, ## __VA_ARGS__);
/**
* 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[]);
/**
* 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);