linux-kernel - Re: [RFC] switch m68k to use the generic remapping DMA allocator

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Message-ID: <CAMuHMdUNwERTRg4MbkkD62EtNhsU7kWVy6x4kB89rYh6ann0Pw@mail.gmail.com>
Date:   Tue, 25 Jun 2019 09:26:48 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Greg Ungerer <gerg@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] switch m68k to use the generic remapping DMA allocator

Hi Christoph,

On Tue, Jun 25, 2019 at 8:33 AM Christoph Hellwig <hch@....de> wrote:
> On Mon, Jun 17, 2019 at 08:53:55PM +0200, Geert Uytterhoeven wrote:
> > On Fri, Jun 14, 2019 at 12:21 PM Christoph Hellwig <hch@....de> wrote:
> > > can you take a look at the (untested) patches below?  They convert m68k
> > > to use the generic remapping DMA allocator, which is also used by
> > > arm64 and csky.
> >
> > Thanks. But what does this buy us?
>
> A common dma mapping code base with everyone, including supporting
> DMA allocations from atomic context, which the documentation and
> API assume are there, but which don't work on m68k.

OK, thanks!

> > bloat-o-meter says:
> >
> > add/remove: 75/0 grow/shrink: 11/6 up/down: 4122/-82 (4040)
>
> What do these values stand for?  The code should grow a little as
> we now need to include the the pool allocator for the above API
> fix.

Last 3 values are "bytes added/removed (net increase)".
So this increases the static kernel size by ca. 4 KiB.

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