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Use #if IS_ENABLED() instead of #ifdef for configurations as vendor module guidelines. Use #if IS_ENABLED(CONFIG_XXX) instead of #ifdef CONFIG_XXX to ensure that the code inside the #if block continues to compile if the config changes to a tristate config in the future. The differences are as follows: 1.#if IS_ENABLED(CONFIG_XXX) evaluates to true when CONFIG_XXX is set to module (=m) or built-in (=y). 2.#ifdef CONFIG_XXX evaluates to true when CONFIG_XXX is set to built-in(=y) , but doesn't when CONFIG_XXX is set to module(=m). Use this only when you're certain you want to do the same thing when the config is set to module or is disabled. Change-Id: Ia806b9b01ad8414d0e4de027a382cb68e7fb4a6a Signed-off-by: GG Hou <quic_renjhou@quicinc.com>