Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[platform/kernel/linux-starfive.git] / mm / mm_slot.h
1 // SPDX-License-Identifier: GPL-2.0
2
3 #ifndef _LINUX_MM_SLOT_H
4 #define _LINUX_MM_SLOT_H
5
6 #include <linux/hashtable.h>
7 #include <linux/slab.h>
8
9 /*
10  * struct mm_slot - hash lookup from mm to mm_slot
11  * @hash: link to the mm_slots hash list
12  * @mm_node: link into the mm_slots list
13  * @mm: the mm that this information is valid for
14  */
15 struct mm_slot {
16         struct hlist_node hash;
17         struct list_head mm_node;
18         struct mm_struct *mm;
19 };
20
21 #define mm_slot_entry(ptr, type, member) \
22         container_of(ptr, type, member)
23
24 static inline void *mm_slot_alloc(struct kmem_cache *cache)
25 {
26         if (!cache)     /* initialization failed */
27                 return NULL;
28         return kmem_cache_zalloc(cache, GFP_KERNEL);
29 }
30
31 static inline void mm_slot_free(struct kmem_cache *cache, void *objp)
32 {
33         kmem_cache_free(cache, objp);
34 }
35
36 #define mm_slot_lookup(_hashtable, _mm)                                        \
37 ({                                                                             \
38         struct mm_slot *tmp_slot, *mm_slot = NULL;                             \
39                                                                                \
40         hash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \
41                 if (_mm == tmp_slot->mm) {                                     \
42                         mm_slot = tmp_slot;                                    \
43                         break;                                                 \
44                 }                                                              \
45                                                                                \
46         mm_slot;                                                               \
47 })
48
49 #define mm_slot_insert(_hashtable, _mm, _mm_slot)                              \
50 ({                                                                             \
51         _mm_slot->mm = _mm;                                                    \
52         hash_add(_hashtable, &_mm_slot->hash, (unsigned long)_mm);             \
53 })
54
55 #endif /* _LINUX_MM_SLOT_H */