Re: [PATCH v3 3/8] of/address: Introduce of_dma_get_max_cpu_address()

[Nicolas Saenz Julienne]

On Thu, 2020-10-15 at 07:42 +0200, Christoph Hellwig wrote:
> > +phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
> > +{
> > +	phys_addr_t max_cpu_addr = PHYS_ADDR_MAX;
> > +	struct of_range_parser parser;
> > +	phys_addr_t subtree_max_addr;
> > +	struct device_node *child;
> > +	phys_addr_t cpu_end = 0;
> > +	struct of_range range;
> > +	const __be32 *ranges;
> > +	int len;
> > +
> > +	if (!np)
> > +		np = of_root;
> 
> Requiring of_root to be passed explicitly would seem more natural
> to me than the magic NULL argument.  There doesn't seem to be any
> precedent for that kind of calling convention either.

I inspired that behavior from __of_find_all_nodes(). I'll change it.

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