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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Backport mm APIs.
*
* Copyright (C) 2021 Google, Inc.
*/
#ifndef __MM_BACKPORT_H__
#define __MM_BACKPORT_H__
#include <linux/mm.h>
/*
* Define pin_user_pages* which are introduced in Linux 5.6.
*
* We simply define pin_user_pages* as get_user_pages* here so our driver can
* prefer PIN over GET when possible.
*/
#ifndef FOLL_PIN
/* define as zero to prevent older get_user_pages* returning EINVAL */
#define FOLL_LONGTERM 0
#define pin_user_pages_fast get_user_pages_fast
#define unpin_user_page put_page
#endif /* FOLL_PIN */
#endif /* __MM_BACKPORT_H__ */
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