Re: [PATCH 20/20] [RFC] sh: dma: Remove unused functionality

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Adrian,

On Wed, May 1, 2024 at 3:58 PM John Paul Adrian Glaubitz
<glaubitz@physik.fu-berlin.de> wrote:
> On Wed, 2024-05-01 at 11:12 +0200, John Paul Adrian Glaubitz wrote:
> > On Fri, 2024-03-01 at 22:02 +0100, Geert Uytterhoeven wrote:
> > > dma_extend(), get_dma_info_by_name(), register_chan_caps(), and
> > > request_dma_bycap() are unused.  Remove them, and all related code.
> > >
> > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

> > I assume we could re-add these again in case we need them, but it would be good
> > if Yoshinori could comment on whether we should keep these functions or not.
>
> I was wondering: Could there be any userland tools using these DMA functions?

They cannot be called from userspace, as there is no API for that.
They can only be called from inside the kernel, or from a kernel module
(possibly out-of-tree).

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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