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linux: list: add a function to count list nodes

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Add a function to count the nodes of a list.

Taken from linux 6.11-rc1 tag commit 8400291e289e.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Sughosh Ganu 2024-07-30 16:41:28 +05:30 • committed by Heinrich Schuchardt
parent 48940c6429
commit c809b3b641
1 changed files with 15 additions and 0 deletions
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15
include/linux/list.h
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@ -547,6 +547,21 @@ static inline void list_splice_tail_init(struct list_head *list,
&pos->member != (head); \
pos = n, n = list_entry(n->member.prev, typeof(*n), member))
/**
* list_count_nodes - count nodes in the list
* @head: the head for your list.
*/
static inline size_t list_count_nodes(struct list_head *head)
{
struct list_head *pos;
size_t count = 0;
list_for_each(pos, head)
count++;
return count;
}
/*
* Double linked lists with a single pointer list head.
* Mostly useful for hash tables where the two pointer list head is