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xu xin
5c3746a0fe
mm_slot_lookup() and mm_slot_insert() are the only helpers in this header that are implemented as macros rather than static inline functions. This may look inconsistent without explanation. Explain they must be macros because hash_for_each_possible() needs the table as an array (for sizeof), not a pointer. Link: https://lore.kernel.org/20260714092815120Wv-CFDlLKtsTmda--97Qw@zte.com.cn Signed-off-by: xu xin <xu.xin16@zte.com.cn> Reviewed-by: Barry Song <baohua@kernel.org> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Qi Zheng <qi.zheng@linux.dev> Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org> Reviewed-by: SJ Park <sj@kernel.org> Reviewed-by: Zi Yan <ziy@nvidia.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Dev Jain <dev.jain@arm.com> Cc: Lance Yang <lance.yang@linux.dev> Cc: Nico Pache <npache@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Wang Yaxin <wang.yaxin@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef _LINUX_MM_SLOT_H
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#define _LINUX_MM_SLOT_H
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#include <linux/hashtable.h>
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#include <linux/slab.h>
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/*
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* struct mm_slot - hash lookup from mm to mm_slot
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* @hash: link to the mm_slots hash list
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* @mm_node: link into the mm_slots list
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* @mm: the mm that this information is valid for
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*/
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struct mm_slot {
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struct hlist_node hash;
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struct list_head mm_node;
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struct mm_struct *mm;
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};
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#define mm_slot_entry(ptr, type, member) \
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container_of(ptr, type, member)
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static inline void *mm_slot_alloc(struct kmem_cache *cache)
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{
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if (!cache) /* initialization failed */
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return NULL;
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return kmem_cache_zalloc(cache, GFP_KERNEL);
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}
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static inline void mm_slot_free(struct kmem_cache *cache, void *objp)
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{
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kmem_cache_free(cache, objp);
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}
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/*
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* Note: mm_slot_lookup and mm_slot_insert cannot be converted to static inline
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* functions because the hash helpers (hash_for_each_possible and hash_add) rely
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* on the actual array argument 'hashtable' for sizeof() instead of pointers.
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*/
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#define mm_slot_lookup(_hashtable, _mm) \
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({ \
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struct mm_slot *tmp_slot, *mm_slot = NULL; \
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\
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hash_for_each_possible(_hashtable, tmp_slot, hash, (unsigned long)_mm) \
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if (_mm == tmp_slot->mm) { \
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mm_slot = tmp_slot; \
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break; \
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} \
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\
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mm_slot; \
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})
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#define mm_slot_insert(_hashtable, _mm, _mm_slot) \
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({ \
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_mm_slot->mm = _mm; \
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hash_add(_hashtable, &_mm_slot->hash, (unsigned long)_mm); \
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})
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static inline void mm_slot_remove(struct mm_slot *slot)
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{
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hash_del(&slot->hash);
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list_del(&slot->mm_node);
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}
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#endif /* _LINUX_MM_SLOT_H */
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