m68k: don't provide arch_dma_alloc for nommu/coldfire

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Coldfire cores configured with a data cache can't provide coherent
DMA allocations at all.

Instead of returning non-coherent kernel memory in this case,
return NULL and fail the allocation.

The only driver that used to rely on the previous behavior (fec) has
been switched to use non-coherent allocations for this case recently.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Tested-by: Greg Ungerer <gerg@linux-m68k.org>

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This commit is contained in:

Christoph Hellwig 2023-10-12 09:52:27 +02:00

parent ffd32a92b3

commit 7a360df941

2 changed files with 0 additions and 24 deletions

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1

arch/m68k/Kconfig

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23

arch/m68k/kernel/dma.c

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