On Tue, Apr 26, 2022 at 11:35:20AM +0800, Liu Xinpeng wrote: > @@ -596,7 +596,6 @@ static int iTCO_wdt_probe(struct platform_device *pdev) > return 0; > } > > -#ifdef CONFIG_PM_SLEEP > /* > * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so > * the watchdog cannot be pinged while in that state. In ACPI sleep states the > @@ -637,20 +636,15 @@ static int iTCO_wdt_resume_noirq(struct device *dev) > } > > static const struct dev_pm_ops iTCO_wdt_pm = { > - .suspend_noirq = iTCO_wdt_suspend_noirq, > - .resume_noirq = iTCO_wdt_resume_noirq, > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(iTCO_wdt_suspend_noirq, > + iTCO_wdt_resume_noirq) Thus, iTCO_wdt_suspend_noirq and iTCO_wdt_resume_noirq are possible unused. Put __maybe_unused attribute to them.