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kernel_samsung_sm7125/drivers/vservices/compat.h

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/*
* drivers/vservices/compat.h
*
* Copyright (c) 2012-2018 General Dynamics
* Copyright (c) 2014 Open Kernel Labs, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Wrapper functions/definitions for compatibility between differnet kernel
* versions.
*/
#ifndef _VSERVICES_COMPAT_H
#define _VSERVICES_COMPAT_H
#include <linux/workqueue.h>
#include <linux/version.h>
/* The INIT_WORK_ONSTACK macro has a slightly different name in older kernels */
#ifndef INIT_WORK_ONSTACK
#define INIT_WORK_ONSTACK(_work, _func) INIT_WORK_ON_STACK(_work, _func)
#endif
/*
* We require a workqueue with no concurrency. This is provided by
* create_singlethread_workqueue() in kernel prior to 2.6.36.
* In later versions, create_singlethread_workqueue() enables WQ_MEM_RECLAIM and
* thus WQ_RESCUER, which allows work items to be grabbed by a rescuer thread
* and run concurrently if the queue is running too slowly. We must use
* alloc_ordered_workqueue() instead, to disable the rescuer.
*/
static inline struct workqueue_struct *
vs_create_workqueue(const char *name)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
return create_singlethread_workqueue(name);
#else
return alloc_ordered_workqueue(name, 0);
#endif
}
/*
* The max3 macro has only been present from 2.6.37
* (commit: f27c85c56b32c42bcc54a43189c1e00fdceb23ec)
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37)
#define max3(x, y, z) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
typeof(z) _max3 = (z); \
(void) (&_max1 == &_max2); \
(void) (&_max1 == &_max3); \
_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
(_max2 > _max3 ? _max2 : _max3); })
#endif
#endif /* _VSERVICES_COMPAT_H */