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 */ 56