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Message-ID: <CA+8MBb+9prWYSmp25K-LMUv1_0eekvFqXhoj87CV9zcaXfMDGg@mail.gmail.com>
Date:   Wed, 2 Jan 2019 13:53:33 -0800
From:   Tony Luck <tony.luck@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     iommu@...ts.linux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Keith Busch <keith.busch@...el.com>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        linux-pci@...r.kernel.org,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        X86-ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/15] swiotlb: remove dma_mark_clean

On Fri, Dec 7, 2018 at 11:08 AM Christoph Hellwig <hch@....de> wrote:
>
> Instead of providing a special dma_mark_clean hook just for ia64, switch
> ia64 to use the normal arch_sync_dma_for_cpu hooks instead.
>
> This means that we now also set the PG_arch_1 bit for pages in the
> swiotlb buffer, which isn't stricly needed as we will never execute code
> out of the swiotlb buffer, but otherwise harmless.

ia64 build based on arch/ia64/configs/zx1_defconfig now fails with undefined
symbols arch_dma_alloc and arch_dma_free (used by kernel/dma/direct.c).

This config doesn't define CONFIG_SWIOTLB, so we don't get the
benefit of the routines in arch/ia64/kernel/dma-mapping.c

-Tony

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