linux-kernel - Re: [PATCH v3 3/8] of/address: Introduce of_dma_get_max_cpu

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Date:   Thu, 15 Oct 2020 07:42:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     robh+dt@...nel.org, catalin.marinas@....com, hch@....de,
        ardb@...nel.org, linux-kernel@...r.kernel.org,
        Frank Rowand <frowand.list@...il.com>, robin.murphy@....com,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, jeremy.linton@....com,
        iommu@...ts.linux-foundation.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/8] of/address: Introduce
 of_dma_get_max_cpu_address()

> +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.