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1// SPDX-License-Identifier: GPL-2.02 3#ifndef _LINUX_MM_SLOT_H4#define _LINUX_MM_SLOT_H5 6#include <linux/hashtable.h>7#include <linux/slab.h>8 9/*10 * struct mm_slot - hash lookup from mm to mm_slot11 * @hash: link to the mm_slots hash list12 * @mm_node: link into the mm_slots list13 * @mm: the mm that this information is valid for14 */15struct 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 24static 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 31static 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