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md/raid0: Ignore RAID0 layout if the second zone has only one device
commit ea23994 upstream. The RAID0 layout is irrelevant if all members have the same size so the array has only one zone. It is *also* irrelevant if the array has two zones and the second zone has only one device, for example if the array has two members of different sizes. So in that case it makes sense to allow assembly even when the layout is undefined, like what is done when the array has only one zone. Reviewed-by: NeilBrown <neilb@suse.de> Signed-off-by: Pascal Hambourg <pascal@plouf.fr.eu.org> Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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