1 /*- 2 * Copyright (c) 2017 Mellanox Technologies, Ltd. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUXKPI_LINUX_MM_TYPES_H_ 28 #define _LINUXKPI_LINUX_MM_TYPES_H_ 29 30 #include <linux/types.h> 31 #include <linux/page.h> 32 #include <linux/rwsem.h> 33 34 #include <asm/atomic.h> 35 36 typedef int vm_fault_t; 37 38 struct vm_area_struct; 39 struct task_struct; 40 41 struct mm_struct { 42 struct vm_area_struct *mmap; 43 atomic_t mm_count; 44 atomic_t mm_users; 45 size_t pinned_vm; 46 /* Renamed to mmap_lock in v5.8 */ 47 struct rw_semaphore mmap_sem; 48 }; 49 50 extern void linux_mm_dtor(struct mm_struct *mm); 51 52 static inline void 53 mmdrop(struct mm_struct *mm) 54 { 55 if (__predict_false(atomic_dec_and_test(&mm->mm_count))) 56 linux_mm_dtor(mm); 57 } 58 59 static inline bool 60 mmget_not_zero(struct mm_struct *mm) 61 { 62 return (atomic_inc_not_zero(&mm->mm_users)); 63 } 64 65 static inline void 66 mmput(struct mm_struct *mm) 67 { 68 if (__predict_false(atomic_dec_and_test(&mm->mm_users))) 69 mmdrop(mm); 70 } 71 72 static inline void 73 mmgrab(struct mm_struct *mm) 74 { 75 atomic_inc(&mm->mm_count); 76 } 77 78 extern struct mm_struct *linux_get_task_mm(struct task_struct *); 79 #define get_task_mm(task) linux_get_task_mm(task) 80 81 #endif /* _LINUXKPI_LINUX_MM_TYPES_H_ */ 82