d' defined but not used [-Wunused-function] warning: 'xxx_resume' defined but not used [-Wunused-function] Because SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) Only references the callbacks on CONFIG_PM_SLEEP (instead of CONFIG_PM). Cc: Mattia Dongili Cc: Arnd Bergmann Cc: platform-driver-x86@vger.kernel.org Signed-off-by: Yuanhan Liu Signed-off-by: Fengguang Wu Signed-off-by: Greg Kroah-Hartman U