The raw NAND flash code uses an implicit switch/case fallthrough to share code when dealing with different ECC modes, and also when handling some read command. Add our "fallthrough;" statement-like macro before the respective labels in the NAND code, to avoid a warning when GCC's -Wimplicit-fallthrough warning option is enabled. This copies the fallthrough annotations that the original kernel code gained, before this function got refactored there. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Michael Trimrachi <michael@amarulasolutions.com>