linux-kernel - Re: [v2 PATCH 1/2] Add new uio device for dynamic memory allocation

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Message-ID: <CAMuHMdWKByLXR-2wkiej=F1WPf7xePf3nMkUqwSf_hEJNNZbvg@mail.gmail.com>
Date:	Sun, 4 Nov 2012 14:20:00 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Damian Hobson-Garcia <dhobsong@...l.co.jp>
Cc:	hjk@...sjkoch.de, gregkh@...uxfoundation.org,
	magnus.damm@...il.com, horms@...ge.net.au,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	hdk@...l.co.jp, Linux-Next <linux-next@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [v2 PATCH 1/2] Add new uio device for dynamic memory allocation

On Tue, Sep 25, 2012 at 8:09 AM, Damian Hobson-Garcia
<dhobsong@...l.co.jp> wrote:
> are holding the device file open, the address returned to userspace is
> DMA_ERROR_CODE.

Only a small subset of the architectures
(arm/ia64/microblaze/openrisc/powerpc/sparc/x86)
seem to define DMA_ERROR_CODE, causing everywhere else:

drivers/uio/uio_dmem_genirq.c: In function ‘uio_dmem_genirq_release’:
drivers/uio/uio_dmem_genirq.c:95: error: ‘DMA_ERROR_CODE’ undeclared
(first use in this function)
drivers/uio/uio_dmem_genirq.c:95: error: (Each undeclared identifier
is reported only once
drivers/uio/uio_dmem_genirq.c:95: error: for each function it appears in.)
drivers/uio/uio_dmem_genirq.c: In function ‘uio_dmem_genirq_probe’:
drivers/uio/uio_dmem_genirq.c:238: error: ‘DMA_ERROR_CODE’ undeclared
(first use in this function)
make[1]: *** [drivers/uio/uio_dmem_genirq.o] Error 1
make: *** [drivers/uio/] Error 2

(e.g. http://kisskb.ellerman.id.au/kisskb/buildresult/7462173/)

Furthermore, none of them define it in <uapi/...>, so DMA_ERROR_CODE is not
part of the userspace API (yet), while it is architecture-specific (some use 0,
others ~0).

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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