| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Backport mm APIs. |
| * |
| * Copyright (C) 2021 Google LLC |
| */ |
| #ifndef __MM_BACKPORT_H__ |
| #define __MM_BACKPORT_H__ |
| |
| #include <linux/mm.h> |
| #include <linux/version.h> |
| |
| #if KERNEL_VERSION(5, 6, 0) > LINUX_VERSION_CODE |
| |
| /* |
| * 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 /* LINUX_VERSION_CODE < KERNEL_VERSION(5,6,0) */ |
| |
| #endif /* __MM_BACKPORT_H__ */ |