linux-kernel - Re: [PATCH v2] spi/drivers: Restrict COMPILE_TEST by HAS

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Message-ID: <20140829173752.GX29327@sirena.org.uk>
Date:	Fri, 29 Aug 2014 18:37:52 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] spi/drivers: Restrict COMPILE_TEST by HAS_DMA where
 needed

On Fri, Aug 29, 2014 at 06:10:31PM +0200, Geert Uytterhoeven wrote:
> commit dd1053a93fdc11d4 ("spi/drivers: Enable build of drivers with
> COMPILE_TEST") allows compile-testing drivers on platforms they're not
> meant for.

> However, adding "|| COMPILE_TEST" bypasses all other implicit dependencies
> assumed by the platform dependencies before, like HAS_DMA.

I'm wondering if it isn't better to have the non-DMA platforms define
stub (always error) DMA functions instead - it's less error prone and
with SPI there's a bunch of drivers which can run perfectly usefully
without DMA while optionally supporting DMA.

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