[PATCH 1/5] linux: list: add a function to count list nodes

[Heinrich Schuchardt]

On 7/30/24 13:11, Sughosh Ganu wrote:
> Add a function to count the nodes of a list.

This could function could be used in lot of different code locations:

test/boot/expo.c:707
lib/fwu_updates/fwu_mtd.c:64
lib/efi_loader/efi_memory.c:755
lib/efi_loader/efi_boottime.c:2519
fs/yaffs2/yaffs_guts.c:4460
drivers/mtd/ubi/fastmap.c:589
drivers/mtd/ubi/fastmap.c:586
drivers/core/util.c:18
boot/scene.c:85

Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

>
> Taken from linux 6.11-rc1 tag commit 8400291e289e.
>
> Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
> ---
>   include/linux/list.h | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>
> diff --git a/include/linux/list.h b/include/linux/list.h
> index 6910721c00..0f9d939b05 100644
> --- a/include/linux/list.h
> +++ b/include/linux/list.h
> @@ -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