linux-kernel - Re: [PATCH 6/6] driver core: initialize a default DMA mask for platform device

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Date:   Fri, 16 Aug 2019 09:39:03 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Gavin Li <git@...gavinli.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Minas Harutyunyan <hminas@...opsys.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Geoff Levand <geoff@...radead.org>,
        Michal Simek <michal.simek@...inx.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Bin Liu <b-liu@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        USB list <linux-usb@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] driver core: initialize a default DMA mask for
 platform device

Hi Christoph,

On Fri, Aug 16, 2019 at 8:30 AM Christoph Hellwig <hch@....de> wrote:
> We still treat devices without a DMA mask as defaulting to 32-bits for
> both mask, but a few releases ago we've started warning about such
> cases, as they require special cases to work around this sloppyness.
> Add a dma_mask field to struct platform_device so that we can initialize
> the dma_mask pointer in struct device and initialize both masks to
> 32-bits by default, replacing similar functionality in m68k and
> powerpc.  The arch_setup_pdev_archdata hooks is now unused and removed.
>
> Note that the code looks a little odd with the various conditionals
> because we have to support platform_device structures that are
> statically allocated.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/m68k/kernel/dma.c               |  9 -------

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

>  arch/sh/boards/mach-ecovec24/setup.c |  2 --
>  arch/sh/boards/mach-migor/setup.c    |  1 -

Acked-by: Geert Uytterhoeven <geert+renesas@...der.be>
given "[PATCH 0/2] Remove calls to empty arch_setup_pdev_archdata()"
https://lore.kernel.org/linux-renesas-soc/1526641611-2769-1-git-send-email-geert+renesas@glider.be/

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