linux-kernel - Re: [PATCH v6 6/6] pci: Add support for creating a generic host

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Date:	Mon, 10 Mar 2014 20:16:25 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Liviu Dudau <Liviu.Dudau@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	linux-pci <linux-pci@...r.kernel.org>,
	Will Deacon <Will.Deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v6 6/6] pci: Add support for creating a generic
 host_bridge from device tree

On Mon, Mar 10, 2014 at 7:59 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> arch/avr32/include/asm/io.h:#define IO_SPACE_LIMIT    0xffffffff
>> arch/frv/include/asm/io.h:#define IO_SPACE_LIMIT      0xffffffff
>
> They have no MMU, and the code relies on the port number to match
> both the virtual and the physical address. You could be right about
> these, but I would guess that the code also needs some other
> changes if we want to make it work on nommu kernels. It also depends
> on whether the I/O bus address is the same as the CPU address, or
> if it starts at bus address 0.

>> arch/m68k/include/asm/io_no.h:#define IO_SPACE_LIMIT 0xffffffff
>
> This looks like a mistake, it should be smaller

io_no.h is for nommu.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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