With the new fancy yielding poller support, we can properly represent
kernel threads in barebox. Do so.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
include/linux/kthread.h | 72 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 include/linux/kthread.h
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
new file mode 100644
index 000000000000..17b6de9cf168
--- /dev/null
+++ b/include/linux/kthread.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KTHREAD_H
+#define _LINUX_KTHREAD_H
+/* Wrapper around pollers to ease porting from Linux */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <poller.h>
+
+struct task_struct {
+ struct poller_struct poller;
+ int (*threadfn)(void *data);
+ void *data;
+};
+
+static inline void kthread_poller(struct poller_struct *poller)
+{
+ struct task_struct *task = container_of(poller, struct task_struct, poller);
+ task->threadfn(task->data);
+}
+
+static inline struct task_struct *kthread_create(int (*threadfn)(void *data),
+ void *data, const char *name)
+{
+ struct task_struct *task;
+
+ task = calloc(sizeof(*task), 1);
+ if (!task)
+ return ERR_PTR(-ENOMEM);
+
+ task->threadfn = threadfn;
+ task->data = data;
+ task->poller.func = kthread_poller;
+ task->poller.name = strdup(name);
+
+ return task;
+}
+
+static inline int wake_up_process(struct task_struct *task)
+{
+ return poller_register(&task->poller, task->poller.name);
+}
+
+/**
+ * kthread_run - create and wake a thread.
+ * @threadfn: the function to run until signal_pending(current).
+ * @data: data ptr for @threadfn.
+ * @name: name for the thread.
+ *
+ * Description: Convenient wrapper for kthread_create() followed by
+ * wake_up_process(). Returns the kthread or ERR_PTR(-ENOMEM).
+ */
+#define kthread_run(threadfn, data, name) \
+({ \
+ struct task_struct *__k \
+ = kthread_create(threadfn, data, name); \
+ if (!IS_ERR(__k)) \
+ wake_up_process(__k); \
+ __k; \
+})
+
+static inline void free_kthread_struct(struct task_struct *k)
+{
+ if (!k)
+ return;
+
+ poller_unregister(&k->poller);
+ free(k);
+}
+
+#endif /* _LINUX_KTHREAD_H */
--
2.29.2
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