linux-kernel - Re: [PATCH 1/2] [RESEND] of: provide of_n_{addr,size}_cells wrappers for !CONFIG

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Date:   Mon, 18 Sep 2017 16:28:04 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Frank Rowand <frowand.list@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Magnus Damm <damm@...nsource.se>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        SH-Linux <linux-sh@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] [RESEND] of: provide of_n_{addr,size}_cells wrappers
 for !CONFIG_OF

On Mon, Sep 11, 2017 at 3:07 PM, Arnd Bergmann <arnd@...db.de> wrote:
> The pci-rcar driver is enabled for compile tests, and this has
> shown that the driver cannot build without CONFIG_OF,
> following the inclusion of f8f2fe7355fb "PCI: rcar: Use new OF
> interrupt mapping when possible":
>
> drivers/pci/host/pcie-rcar.c: In function 'pci_dma_range_parser_init':
> drivers/pci/host/pcie-rcar.c:1039:2: error: implicit declaration of function 'of_n_addr_cells' [-Werror=implicit-function-declaration]
>   parser->pna = of_n_addr_cells(node);
>   ^
> As pointed out by Ben Dooks and Geert Uytterhoeven, this is actually
> supposed to build fine, which we can achieve if we make the
> declaration of of_irq_parse_and_map_pci conditional on CONFIG_OF
> and provide an empty inline function otherwise, as we do for
> a lot of other of interfaces.
>
> This lets us build the rcar_pci driver again without CONFIG_OF
> for build testing. All platforms using this driver select OF,
> so this doesn't change anything for the users.

Sorry, I keep missing this. It's a flaw in my mail filtering...

There's a patch series[1] to factor out pci_dma_range_parser_init of
the driver which should also fix this. I'd prefer not to take this
because ideally all address parsing should be within the DT core code.

Rob

[1] https://patchwork.kernel.org/patch/9927541/