Following BUILD_BUG_ON using a variable fails for some of the compilers and optimization levels (reported for gcc 4.9): var = ARRAY_SIZE(s2mps15_regulators); BUILD_BUG_ON(S2MPS_REGULATOR_MAX < var); Fix this by using ARRAY_SIZE directly. Additionally add missing BUILD_BUG_ON check for S2MPS15 device (the check ensures that internal arrays are big enough to hold data for all of regulators on all devices). Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Tested-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mark Brown <broonie@kernel.org>