linux-kernel - Re: [PATCH v4 08/11] lib/vsprintf: Make use of fwnode API to obtain node names and separators

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Date:   Mon, 2 Sep 2019 18:41:49 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     rafael@...nel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        devicetree@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v4 08/11] lib/vsprintf: Make use of fwnode API to obtain
 node names and separators

Hi Petr,

Thanks for the review.

On Mon, Sep 02, 2019 at 05:18:03PM +0200, Petr Mladek wrote:
> On Mon 2019-09-02 11:32:37, Sakari Ailus wrote:
> > Instead of implementing our own means of discovering parent nodes, node
> > names or counting how many parents a node has, use the newly added
> > functions in the fwnode API to obtain that information.
> > 
> > Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> >  lib/vsprintf.c | 38 ++++++++++++++++----------------------
> >  1 file changed, 16 insertions(+), 22 deletions(-)
> > 
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > index b00b57f9f911f..a04a2167101ef 100644
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -1863,32 +1864,24 @@ char *flags_string(char *buf, char *end, void *flags_ptr,
> >  	return format_flags(buf, end, flags, names);
> >  }
> >  
> > -static const char *device_node_name_for_depth(const struct device_node *np, int depth)
> > -{
> > -	for ( ; np && depth; depth--)
> > -		np = np->parent;
> > -
> > -	return kbasename(np->full_name);
> > -}
> > -
> >  static noinline_for_stack
> > -char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
> > +char *fwnode_full_name_string(struct fwnode_handle *fwnode, char *buf,
> > +			      char *end)
> >  {
> >  	int depth;
> > -	const struct device_node *parent = np->parent;
> >  
> > -	/* special case for root node */
> > -	if (!parent)
> > -		return string_nocheck(buf, end, "/", default_str_spec);
> > +	for (depth = fwnode_count_parents(fwnode); depth >= 0; depth--) {
> 
> It looked suspicious that it iterated "depth + 1" times. It might be
> obvious for people traversing paths every day but not for me ;-)
> Please, add a comment, for example:
> 
> 	/* Iterate over parents and current node. */
> 
> With the above comment:
> 
> Reviewed-by: Petr Mladek <pmladek@...e.com>

Thanks.

How about:

	/* Loop starting from the root node to the current node. */

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com