linux-kernel - Re: [PATCH V5 6/8] misc/pvpanic: add MMIO support

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Message-ID: <CAHp75VfNDKgenuc0ApMODfCw6h9azwBDskPuV2S4E8nLFsuTxw@mail.gmail.com>
Date:   Thu, 1 Nov 2018 19:04:00 +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 V5 6/8] misc/pvpanic: add MMIO support

On Thu, Nov 1, 2018 at 9:00 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.

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


> +               if (r.flags & IORESOURCE_IO)

You need spend some time to understand better how acpi_dev_resource_*() works.
Hint: this condition is redundant.

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


-- 
With Best Regards,
Andy Shevchenko