disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/alarmtimer.h
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@@ -5,7 +5,8 @@
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 #include <linux/time.h>
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 #include <linux/hrtimer.h>
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 #include <linux/timerqueue.h>
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-#include <linux/rtc.h>
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+
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+struct rtc_device;
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 enum alarmtimer_type {
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 	ALARM_REALTIME,
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@@ -59,7 +60,11 @@
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 u64 alarm_forward_now(struct alarm *alarm, ktime_t interval);
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 ktime_t alarm_expires_remaining(const struct alarm *alarm);
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+#ifdef CONFIG_RTC_CLASS
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 /* Provide way to access the rtc device being used by alarmtimers */
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 struct rtc_device *alarmtimer_get_rtcdev(void);
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+#else
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+static inline struct rtc_device *alarmtimer_get_rtcdev(void) { return NULL; }
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+#endif
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 #endif