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From: Bjorn Helgaas <helgaas@kernel.org>
To: John Garry <john.garry@huawei.com>
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: Thu, 13 Jun 2019 15:09:32 -0500	[thread overview]
Message-ID: <20190613200932.GJ13533@google.com> (raw)
In-Reply-To: <8ef228f8-97cb-e40e-ea6b-410b80a845cf@huawei.com>

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

WARNING: multiple messages have this Message-ID (diff)
From: Bjorn Helgaas <helgaas@kernel.org>
To: John Garry <john.garry@huawei.com>
Cc: rjw@rjwysocki.net, wangkefeng.wang@huawei.com,
	lorenzo.pieralisi@arm.com, arnd@arndb.de,
	linux-pci@vger.kernel.org, will.deacon@arm.com,
	linuxarm@huawei.com, linux-kernel@vger.kernel.org,
	catalin.marinas@arm.com, andriy.shevchenko@linux.intel.com,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 1/3] lib: logic_pio: Use logical PIO low-level accessors for !CONFIG_INDIRECT_PIO
Date: Thu, 13 Jun 2019 15:09:32 -0500	[thread overview]
Message-ID: <20190613200932.GJ13533@google.com> (raw)
In-Reply-To: <8ef228f8-97cb-e40e-ea6b-410b80a845cf@huawei.com>

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

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  reply	other threads:[~2019-06-13 20:09 UTC|newest]

Thread overview: 34+ 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 ` 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
2019-06-11 14:12   ` John Garry
2019-06-13  2:39   ` Bjorn Helgaas
2019-06-13  2:39     ` Bjorn Helgaas
2019-06-13  9:39     ` John Garry
2019-06-13  9:39       ` John Garry
2019-06-13 20:09       ` Bjorn Helgaas [this message]
2019-06-13 20:09         ` Bjorn Helgaas
2019-06-14  9:02         ` John Garry
2019-06-14  9:02           ` John Garry
2019-06-14 11:50           ` Bjorn Helgaas
2019-06-14 11:50             ` Bjorn Helgaas
2019-06-14 12:22             ` John Garry
2019-06-14 12:22               ` John Garry
2019-06-13 13:58   ` Bjorn Helgaas
2019-06-13 13:58     ` Bjorn Helgaas
2019-06-13 15:21     ` John Garry
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
2019-06-11 14:12   ` John Garry
2019-06-13  3:20   ` Bjorn Helgaas
2019-06-13  3:20     ` Bjorn Helgaas
2019-06-13  7:47     ` Arnd Bergmann
2019-06-13  7:47       ` Arnd Bergmann
2019-06-13 10:17     ` John Garry
2019-06-13 10:17       ` John Garry
2019-06-13 13:46       ` Bjorn Helgaas
2019-06-13 13:46         ` Bjorn Helgaas
2019-06-13 14:09         ` John Garry
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
2019-06-11 14:12   ` John Garry

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