Hi Günter,
CC Greg
On Mon, Jul 8, 2019 at 9:45 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
On Mon, Jul 08, 2019 at 09:13:02PM +0200, Geert Uytterhoeven wrote:
On Mon, Jul 8, 2019 at 7:06 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
I see the following build error in -next:
kernel/dma/direct.o: In function `dma_direct_alloc_pages':
direct.c:(.text+0x4d8): undefined reference to `arch_dma_prep_coherent'
Example: m68k:allnoconfig.
Bisect log is ambiguous and points to the merge of m68k/for-next into
-next. Yet, I think the problem is with commit 69878ef47562 ("m68k:
Implement arch_dma_prep_coherent()") which is supposed to introduce
the function. The problem is likely that arch_dma_prep_coherent()
is only declared if CONFIG_MMU is enabled, but it is called from code
outside CONFIG_MMU.
Thanks, one more thing to fix in m68k-allnoconfig (did it really build
before?)...
Given you say "example", does it fail in real configs, too?
Yes, it does. All nommu builds fail. allnoconfig and tinyconfig just
happen to be among those.
Building m68k:allnoconfig ... failed
Building m68k:tinyconfig ... failed
Building m68k:m5272c3_defconfig ... failed
Building m68k:m5307c3_defconfig ... failed
Building m68k:m5249evb_defconfig ... failed
Building m68k:m5407c3_defconfig ... failed
Building m68k:m5475evb_defconfig ... failed
Error is always the same.
Thanks!
The error started with next-20190702. Prior to that, builds were fine,
including m68k:allnoconfig and m68k:tinyconfig.
Yeah, it started when I queued up the DMA rework.
I didn't double-check when Greg said it was OK for him, as it wouldn't affect
Coldfire or mmu. Sorry for that.
And that has just been pulled by Linus... Oops...
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
