linux-kernel - Re: [PATCH v4 1/3] lib: logic_pio: Use logical PIO low-level accessors for !CONFIG_INDIRECT

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Message-ID: <20190613200932.GJ13533@google.com>
Date:   Thu, 13 Jun 2019 15:09:32 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     John Garry <john.garry@...wei.com>
Cc:     lorenzo.pieralisi@....com, arnd@...db.de,
        linux-pci@...r.kernel.org, rjw@...ysocki.net,
        linux-arm-kernel@...ts.infradead.org, will.deacon@....com,
        wangkefeng.wang@...wei.com, linuxarm@...wei.com,
        andriy.shevchenko@...ux.intel.com, linux-kernel@...r.kernel.org,
        catalin.marinas@....com
Subject: Re: [PATCH v4 1/3] lib: logic_pio: Use logical PIO low-level
 accessors for !CONFIG_INDIRECT_PIO

On Thu, Jun 13, 2019 at 10:39:12AM +0100, John Garry wrote:
> On 13/06/2019 03:39, Bjorn Helgaas wrote:
> > I'm not sure it's even safe, because CONFIG_INDIRECT_PIO depends on
> > ARM64,  but PCI_IOBASE is defined on most arches via asm-generic/io.h,
> > so this potentially affects arches other than ARM64.
> 
> It would do. It would affect any arch which defines PCI_IOBASE and
> does not have arch-specific definition of inb et all.

What's the reason for testing PCI_IOBASE instead of
CONFIG_INDIRECT_PIO?  If there's a reason it's needed, that's fine,
but it does make this much more complicated to review.

Bjorn