swim: don't call blk_queue_bounce_limit

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.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/Kconfig

@@ -50,7 +50,7 @@ config MAC_FLOPPY
 
 config BLK_DEV_SWIM
 	tristate "Support for SWIM Macintosh floppy"
-	depends on M68K && MAC
+	depends on M68K && MAC && !HIGHMEM
 	help
 	  You should select this option if you want floppy support
 	  and you don't have a II, IIfx, Q900, Q950 or AV series.

drivers/block/swim.c

@@ -816,8 +816,6 @@ static int swim_floppy_init(struct swim_priv *swd)
 		}
 
 		swd->unit[drive].disk->queue = q;
-		blk_queue_bounce_limit(swd->unit[drive].disk->queue,
-				BLK_BOUNCE_HIGH);
 		swd->unit[drive].disk->queue->queuedata = &swd->unit[drive];
 		swd->unit[drive].swd = swd;
 	}