Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * kernel/workqueue_internal.h
 *
 * Workqueue internal header file.  Only to be included by workqueue and
 * core kernel subsystems.
 */
#ifndef _KERNEL_WORKQUEUE_INTERNAL_H
#define _KERNEL_WORKQUEUE_INTERNAL_H
 
#include <linux/workqueue.h>
#include <linux/kthread.h>
#include <linux/preempt.h>
 
struct worker_pool;
 
/*
 * The poor guys doing the actual heavy lifting.  All on-duty workers are
 * either serving the manager role, on idle list or on busy hash.  For
 * details on the locking annotation (L, I, X...), refer to workqueue.c.
 *
 * Only to be used in workqueue and async.
 */
struct worker {
<------>/* on idle list while idle, on busy hash table while busy */
<------>union {
<------><------>struct list_head	entry;	/* L: while idle */
<------><------>struct hlist_node	hentry;	/* L: while busy */
<------>};
 
<------>struct work_struct	*current_work;	/* L: work being processed */
<------>work_func_t		current_func;	/* L: current_work's fn */
<------>struct pool_workqueue	*current_pwq; /* L: current_work's pwq */
<------>struct list_head	scheduled;	/* L: scheduled works */
 
<------>/* 64 bytes boundary on 64bit, 32 on 32bit */
 
<------>struct task_struct	*task;		/* I: worker task */
<------>struct worker_pool	*pool;		/* A: the associated pool */
<------><------><------><------><------><------>/* L: for rescuers */
<------>struct list_head	node;		/* A: anchored at pool->workers */
<------><------><------><------><------><------>/* A: runs through worker->node */
 
<------>unsigned long		last_active;	/* L: last active timestamp */
<------>unsigned int		flags;		/* X: flags */
<------>int			id;		/* I: worker id */
<------>int			sleeping;	/* None */
 
<------>/*
<------> * Opaque string set with work_set_desc().  Printed out with task
<------> * dump for debugging - WARN, BUG, panic or sysrq.
<------> */
<------>char			desc[WORKER_DESC_LEN];
 
<------>/* used only by rescuers to point to the target workqueue */
<------>struct workqueue_struct	*rescue_wq;	/* I: the workqueue to rescue */
 
<------>/* used by the scheduler to determine a worker's last known identity */
<------>work_func_t		last_func;
};
 
/**
 * current_wq_worker - return struct worker if %current is a workqueue worker
 */
static inline struct worker *current_wq_worker(void)
{
<------>if (in_task() && (current->flags & PF_WQ_WORKER))
<------><------>return kthread_data(current);
<------>return NULL;
}
 
/*
 * Scheduler hooks for concurrency managed workqueue.  Only to be used from
 * sched/ and workqueue.c.
 */
void wq_worker_running(struct task_struct *task);
void wq_worker_sleeping(struct task_struct *task);
work_func_t wq_worker_last_func(struct task_struct *task);
 
#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */