// SPDX-License-Identifier: GPL-2.0 #ifndef _LINUX_MM_SLOT_H #define _LINUX_MM_SLOT_H #include <linux/hashtable.h> #include <linux/slab.h> /* * struct mm_slot - hash lookup from mm to mm_slot * @hash: link to the mm_slots hash list * @mm_node: link into the mm_slots list * @mm: the mm that this information is valid for */ struct mm_slot { struct hlist_node hash; struct list_head mm_node; struct mm_struct *mm; }; #define mm_slot_entry(ptr, type, member) \ container_of(ptr, type, member) static inline void *mm_slot_alloc(struct kmem_cache *cache) { if (!cache) /* initialization failed */ return NULL; return kmem_cache_zalloc(cache, GFP_KERNEL); } static inline void mm_slot_free(struct kmem_cache *cache, void *objp) { kmem_cache_free(cache, objp); } #define mm_slot_lookup(_hashtable, _mm) \ ({ \ struct mm_slot *tmp_slot, *mm_slot = NULL; \ \ hash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \ if (_mm == tmp_slot->mm) { \ mm_slot = tmp_slot; \ break; \ } \ \ mm_slot; \ }) #define mm_slot_insert(_hashtable, _mm, _mm_slot) \ ({ \ _mm_slot->mm = _mm; \ hash_add(_hashtable, &_mm_slot->hash, (unsigned long)_mm); \ }) #endif /* _LINUX_MM_SLOT_H */