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 * $FreeBSD$ 27 */ 28 29 #ifndef _LINUX_MM_TYPES_H_ 30 #define _LINUX_MM_TYPES_H_ 31 32 #include <linux/types.h> 33 #include <linux/page.h> 34 #include <linux/rwsem.h> 35 36 #include <asm/atomic.h> 37 38 typedef int vm_fault_t; 39 40 struct vm_area_struct; 41 struct task_struct; 42 43 struct mm_struct { 44 struct vm_area_struct *mmap; 45 atomic_t mm_count; 46 atomic_t mm_users; 47 size_t pinned_vm; 48 struct rw_semaphore mmap_sem; 49 }; 50 51 extern void linux_mm_dtor(struct mm_struct *mm); 52 53 static inline void 54 mmdrop(struct mm_struct *mm) 55 { 56 if (__predict_false(atomic_dec_and_test(&mm->mm_count))) 57 linux_mm_dtor(mm); 58 } 59 60 static inline bool 61 mmget_not_zero(struct mm_struct *mm) 62 { 63 return (atomic_inc_not_zero(&mm->mm_users)); 64 } 65 66 static inline void 67 mmput(struct mm_struct *mm) 68 { 69 if (__predict_false(atomic_dec_and_test(&mm->mm_users))) 70 mmdrop(mm); 71 } 72 73 static inline void 74 mmgrab(struct mm_struct *mm) 75 { 76 atomic_inc(&mm->mm_count); 77 } 78 79 extern struct mm_struct *linux_get_task_mm(struct task_struct *); 80 #define get_task_mm(task) linux_get_task_mm(task) 81 82 #endif /* _LINUX_MM_TYPES_H_ */ 83