m68k doesn't support highmem, so don't bother enabling the block layer bounce buffer code. Just for safety throw in a depend on !HIGHMEM. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210406061725.811389-1-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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