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include: implement list_empty() and list_for_each_entry()

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Implement list_empty() function and list_for_each_entry() macro, newly used by
xsk.c in 2f6324a3937f ("libbpf: Support shared umems between queues and devices")
(Linux commit sha).

Fixes: 5f630710f52e ("libbpf: Support shared umems between queues and devices")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
This commit is contained in:
Andrii Nakryiko
2020-09-03 20:22:42 -07:00
committed by Andrii Nakryiko
parent 6384ee1968
commit 91001a9923
1 changed files with 9 additions and 0 deletions
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9
include/linux/list.h
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@@ -72,11 +72,20 @@ static inline void list_del(struct list_head *entry)
entry->prev = LIST_POISON2;
}
static inline int list_empty(const struct list_head *head)
{
return head->next == head;
}
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)
#define list_first_entry(ptr, type, member) \
list_entry((ptr)->next, type, member)
#define list_next_entry(pos, member) \
list_entry((pos)->member.next, typeof(*(pos)), member)
#define list_for_each_entry(pos, head, member) \
for (pos = list_first_entry(head, typeof(*pos), member); \
&pos->member != (head); \
pos = list_next_entry(pos, member))
#endif