linux-kernel - Re: [PATCH/RFC 0/6] Allow compile-testing NO

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Message-ID: <20180206120102.GD5681@sirena.org.uk>
Date:   Tue, 6 Feb 2018 12:01:02 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Richard Weinberger <richard@....at>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        iommu@...ts.linux-foundation.org, linux-usb@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH/RFC 0/6] Allow compile-testing NO_DMA

On Tue, Feb 06, 2018 at 11:14:46AM +0100, Geert Uytterhoeven wrote:

> The intention of this is twofold:
>   1. To catch users of the DMA API on systems that do no support the DMA
>      mapping API,
>   2. To avoid building drivers that cannot work on such systems anyway.
> 
> However, the disadvantage is that we have to keep on adding dependencies
> on HAS_DMA all over the place.

> Thanks to the COMPILE_TEST symbol, lots of drivers now depend on one or
> more platform dependencies (that imply HAS_DMA) || COMPILE_TEST, thus
> already covering intention #2.  Having to add an explicit dependency on
> HAS_DMA here is cumbersome, and hinders compile-testing.

Thanks for doing this, hopefully it'll make everyone's life easier!

Reviwed-by: Mark Brown <broonie@...nel.org>

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