projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7e736b8e QZ |
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 */ |