__is_lut_linear
degamma_lut && !__is_lut_linear(degamma_lut, degamma_size);
regamma_lut && !__is_lut_linear(regamma_lut, regamma_size);
!__is_lut_linear(degamma_lut, degamma_size);
EXPORT_IF_KUNIT(__is_lut_linear);
bool __is_lut_linear(const struct drm_color_lut *lut, uint32_t size);
KUNIT_EXPECT_FALSE(test, __is_lut_linear(lut, size));
KUNIT_EXPECT_FALSE(test, __is_lut_linear(lut, size));
KUNIT_EXPECT_TRUE(test, __is_lut_linear(lut, size));