[PATCH 1/3] drivers/base: introduce some help routines for reordering a group of dev

[Greg Kroah-Hartman]

On Mon, Jun 25, 2018 at 01:23:05PM +0800, Pingfan Liu wrote:
> This patch introduce some help routines used by next patch. It aims to
> ease reviewing, while the next patch will concentrate on algorithm.
> 
> Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> Cc: Grygorii Strashko <grygorii.strashko at ti.com>
> Cc: Christoph Hellwig <hch at infradead.org>
> Cc: Bjorn Helgaas <helgaas at kernel.org>
> Cc: Dave Young <dyoung at redhat.com>
> Cc: linux-pci at vger.kernel.org
> Cc: linuxppc-dev at lists.ozlabs.org
> Signed-off-by: Pingfan Liu <kernelfans at gmail.com>
> ---
>  drivers/base/core.c | 38 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 36622b5..8113d2c 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -123,6 +123,44 @@ static int device_is_dependent(struct device *dev, void *target)
>  	return ret;
>  }
>  
> +struct pos_info {
> +	struct device *pos;
> +	struct device *tail;
> +};
> +
> +/* caller takes the devices_kset->list_lock */
> +static int descendants_reorder_after_pos(struct device *dev,
> +	void *data)
> +{
> +	struct device *pos;
> +	struct pos_info *p = data;
> +
> +	pos = p->pos;
> +	pr_debug("devices_kset: Moving %s after %s\n",
> +		 dev_name(dev), dev_name(pos));
> +	device_for_each_child(dev, p, descendants_reorder_after_pos);
> +	/* children at the tail */
> +	list_move(&dev->kobj.entry, &pos->kobj.entry);
> +	/* record the right boundary of the section */
> +	if (p->tail == NULL)
> +		p->tail = dev;
> +	return 0;
> +}
> +
> +/* iterate over an open section */
> +#define list_opensect_for_each_reverse(cur, left, right)	\
> +	for (cur = right->prev; cur == left; cur = cur->prev)
> +
> +static bool is_consumer(struct device *query, struct device *supplier)
> +{
> +	struct device_link *link;
> +	/* todo, lock protection */
> +	list_for_each_entry(link, &supplier->links.consumers, s_node)
> +		if (link->consumer == query)
> +			return true;
> +	return false;
> +}

You are adding code that no one uses yet, making this impossible to
review as I don't know what to expect.  I shouldn't have to read the
second patch and have to flip back and forth to try to figure it out :(

sorry, please break this series up in a better way to make it simpler to
review.

greg k-h