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Some more serial drivers can be compile-tested under certain circumstances (when building a specific architecture). So allow for that. This reduces the need of zillion mach/subarch-specific configs. And since the 0day bot has only allmodconfig's for some archs, this increases build coverage there too. Note that cpm needs a minor update in the header, so that it drags in at least some defines (CPM2 ones). Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20220421101708.5640-8-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>