On Mon, Oct 16, 2023 at 7:48 AM Christoph Hellwig <hch@xxxxxx> wrote:
> Coldfire cores configured without a data cache are DMA coherent and
> should thus simply use the simple coherent version of dma-direct.
>
> Introduce a new COLDFIRE_COHERENT_DMA Kconfig symbol as a convenient
> short hand for such configurations, and a M68K_NONCOHERENT_DMA symbol
> for all cases where we need to build non-coherent DMA infrastructure
> to simplify the Kconfig and code conditionals.
>
> Not building the non-coherent DMA code slightly reduces the code
> size for such configurations.
>
> Numers for m5249evb_defconfig below:
>
> text data bss dec hex filename
> 2896158 401052 65392 3362602 334f2a vmlinux.before
> 2895166 400988 65392 3361546 334b0a vmlinux.after
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
The m68kclassic-with-MMU parts look fine to me, so
Acked-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
I'll defer to Greg for the nommu and Coldfire parts...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
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
