[RFC 06/14] include: Add a list empty check function

[Xiang W]

在 2021-03-19五的 15:12 -0700，Atish Patra写道：
> Implement a list helper function that checks for empty lists.
> 
> Signed-off-by: Atish Patra <atish.patra at wdc.com>
Looks good to me.

Reviewed-by: Xiang W <wxjstz at 126.com>

Regards,
Xiang W
> ---
>  include/sbi/sbi_list.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/include/sbi/sbi_list.h b/include/sbi/sbi_list.h
> index 1174ad274c54..b1178dfc9b8e 100644
> --- a/include/sbi/sbi_list.h
> +++ b/include/sbi/sbi_list.h
> @@ -43,6 +43,17 @@ static inline void __sbi_list_add(struct sbi_dlist
> *new,
>  	next->prev = new;
>  }
>  
> +/**
> + * Checks if the list is empty or not.
> + * @param head List head
> + *
> + * Retruns TRUE if list is empty, FALSE otherwise.
> + */
> +static inline bool sbi_list_empty(struct sbi_dlist *head)
> +{
> +	return head->next == head;
> +}
> +
>  /**
>   * Adds the new node after the given head.
>   * @param new New node that needs to be added to list.
> -- 
> 2.25.1
> 
>