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

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Date:   Tue, 6 Feb 2018 16:24:49 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mark Brown <broonie@...nel.org>,
        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>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        linux-usb@...r.kernel.org, linux-scsi <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH/RFC 0/6] Allow compile-testing NO_DMA

On Tue, Feb 6, 2018 at 2:05 PM, Robin Murphy <robin.murphy@....com> wrote:
>
> It looks like we have only one real arch (score) without IOMEM, and two
> (s390 and tile) where it is possible to configure out, so it does seem like
> a reasonable feature to assume. Maybe we could have something like
> asm-generic/no-io.h to provide an "unimplemented" version of those
> interfaces.

Agreed, there is no use trying to optimize for any of those three cases:

For s390, all new machines come with PCI, so distros will enable it all
the time. Few users run their own kernels even on older machines.

score has been de-facto unmaintained for a few years, and tile has
recently been orphaned with the hardware platform being abandoned by
Mellanox.

      Arnd