From: John Garry <john.garry@huawei.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: <lorenzo.pieralisi@arm.com>, <arnd@arndb.de>,
<linux-pci@vger.kernel.org>, <rjw@rjwysocki.net>,
<linux-arm-kernel@lists.infradead.org>, <will.deacon@arm.com>,
<wangkefeng.wang@huawei.com>, <linuxarm@huawei.com>,
<andriy.shevchenko@linux.intel.com>,
<linux-kernel@vger.kernel.org>, <catalin.marinas@arm.com>
Subject: Re: [PATCH v4 1/3] lib: logic_pio: Use logical PIO low-level accessors for !CONFIG_INDIRECT_PIO
Date: Fri, 14 Jun 2019 10:02:52 +0100 [thread overview]
Message-ID: <7495dcab-f293-4b2a-4740-2249f61351f7@huawei.com> (raw)
In-Reply-To: <20190613200932.GJ13533@google.com>
On 13/06/2019 21:09, Bjorn Helgaas wrote:
> 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.
>
Hi Bjorn,
> 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.
For ARM64, we have PCI_IOBASE defined but may not have
CONFIG_INDIRECT_PIO defined. Currently CONFIG_INDIRECT_PIO is only
selected by CONFIG_HISILICON_LPC.
As such, we should make this change also for when CONFIG_INDIRECT_PIO is
not defined.
Thanks,
John
>
> Bjorn
>
> .
>
next prev parent reply other threads:[~2019-06-14 9:06 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-11 14:12 [PATCH v4 0/3] Fix ARM64 crash for accessing unmapped IO port regions John Garry
2019-06-11 14:12 ` [PATCH v4 1/3] lib: logic_pio: Use logical PIO low-level accessors for !CONFIG_INDIRECT_PIO John Garry
2019-06-13 2:39 ` Bjorn Helgaas
2019-06-13 9:39 ` John Garry
2019-06-13 20:09 ` Bjorn Helgaas
2019-06-14 9:02 ` John Garry [this message]
2019-06-14 11:50 ` Bjorn Helgaas
2019-06-14 12:22 ` John Garry
2019-06-13 13:58 ` Bjorn Helgaas
2019-06-13 15:21 ` John Garry
2019-06-11 14:12 ` [PATCH v4 2/3] lib: logic_pio: Reject accesses to unregistered CPU MMIO regions John Garry
2019-06-13 3:20 ` Bjorn Helgaas
2019-06-13 7:47 ` Arnd Bergmann
2019-06-13 10:17 ` John Garry
2019-06-13 13:46 ` Bjorn Helgaas
2019-06-13 14:09 ` John Garry
2019-06-11 14:12 ` [PATCH v4 3/3] lib: logic_pio: Fix up a print John Garry
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