linux-kernel - Re: [PATCH] i2c: sh_mobile: I2C_SH_MOBILE should depend on HAS

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Message-ID: <CAMuHMdWShh+m_0c_3cnGt_2J03u0dhWytER0AqLWoLtauEh5aA@mail.gmail.com>
Date:	Wed, 17 Dec 2014 09:04:52 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Linux I2C <linux-i2c@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: sh_mobile: I2C_SH_MOBILE should depend on HAS_DMA

Hi Wolfram,

On Wed, Dec 17, 2014 at 7:58 AM, Wolfram Sang <wsa@...-dreams.de> wrote:
> On Mon, Dec 15, 2014 at 02:37:04PM +0100, Geert Uytterhoeven wrote:
>> If NO_DMA=y:
>>
>> drivers/built-in.o: In function `sh_mobile_i2c_dma_unmap':
>> i2c-sh_mobile.c:(.text+0x60de42): undefined reference to `dma_unmap_single'
>> drivers/built-in.o: In function `sh_mobile_i2c_xfer_dma':
>> i2c-sh_mobile.c:(.text+0x60df22): undefined reference to `dma_map_single'
>> i2c-sh_mobile.c:(.text+0x60df2e): undefined reference to `dma_mapping_error'
>>
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> Thanks for spotting this. However, since DMA is opt-in, isn't this
> dependency too much? I can't think of anything better than #ifdeffing
> the code, though.

You're right.

E.g. drivers/spi/spi.c (in SPI the mapping is handled by the core), this
code is #ifdefed out.

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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