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Since users can enable/disable drivers at compile time, it may happen that @drivers array is in fact empty (in both its occurrences within the function). This means that ARRAY_CARDINALITY() returns 0UL which makes gcc unhappy because of loop condition: i < ARRAY_CARDINALITY(drivers) GCC complains that @i is unsigned and comparing an unsigned value against 0 is always false. However, changing the type of @i to ssize_t is not enough, because compiler still sees the unsigned zero. The solution is to typecast the ARRAY_CARDINALITY(). Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Jim Fehlig <jfehlig@suse.com>