linux-kernel - Re: [PATCH V7 3/9] misc/pvpanic: add MMIO support

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Date:   Mon, 5 Nov 2018 14:55:03 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     peng.hao2@....com.cn
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        hutao@...fujitsu.com,
        Linux Documentation List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH V7 3/9] misc/pvpanic: add MMIO support

On Mon, Nov 5, 2018 at 4:31 AM Peng Hao <peng.hao2@....com.cn> wrote:
>
> On some architectures (e.g. arm64), it's preferable to use MMIO, since
> this can be used standalone. Add MMIO support to the pvpanic driver.

Thanks for an update, looks quite good, though couple of comments below.

>         if (acpi_dev_resource_io(res, &r)) {
> -               port = r.start;

> +               base = (void __iomem *) ioport_map(r.start,
> +                                       r.end - r.start + 1);

I'm so sorry I didn't notice this stuff.

1. ioport_map() already returns void __iomem *. No need to cast.
2. To calculate resource size we have a helper macro resource_size().

> +               return AE_OK;
> +       } else if (acpi_dev_resource_memory(res, &r)) {
> +               base = ioremap(r.start, r.end - r.start + 1);

Ditto for the size calculation.

>                 return AE_OK;


-- 
With Best Regards,
Andy Shevchenko