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This is probably better approach than 3880ca5ecad1761bd13a190c58f8f85fdd7cd0e1. If dm module is not loaded during dm_is_dm_major call, there are no lines for dm in /proc/devices, of course. Normally, dm_is_dm_major is called to check existing devices, hence if module is not loaded, we can expect there's no DM device present at the same time so we can directly return 0 here (meaning the major number being inspected is not dm device's one). See also https://bugzilla.redhat.com/show_bug.cgi?id=1059711.