timekeeping: Add CONFIG_HAS_PERSISTENT_CLOCK option

Make the persistent clock check a kernel config option, so that some
platform can explicitely select it, also make CONFIG_RTC_HCTOSYS and
RTC_SYSTOHC depend on its non-existence, which could prevent the
persistent clock and RTC code from doing similar thing twice during
system's init/suspend/resume phases.

If the CONFIG_HAS_PERSISTENT_CLOCK=n, then no change happens for kernel
which still does the persistent clock check in timekeeping_init().

Cc: Thomas Gleixner <tglx@linutronix.de>
Suggested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Feng Tang <feng.tang@intel.com>
[jstultz: Added dependency for RTC_SYSTOHC as well]
Signed-off-by: John Stultz <john.stultz@linaro.org>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b377e96..05761de 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -20,6 +20,7 @@ if RTC_CLASS
 config RTC_HCTOSYS
        bool "Set system time from RTC on startup and resume"
        default y
+       depends on !HAS_PERSISTENT_CLOCK
        help
          If you say yes here, the system time (wall clock) will be set using
          the value read from a specified RTC device. This is useful to avoid
@@ -28,6 +29,7 @@ config RTC_HCTOSYS
 config RTC_SYSTOHC
        bool "Set the RTC time based on NTP synchronization"
        default y
+       depends on !HAS_PERSISTENT_CLOCK
        help
          If you say yes here, the system time (wall clock) will be stored
          in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11

diff --git a/include/linux/time.h b/include/linux/time.h
index dfbc4e8..369b6e3 100644 (file)
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -116,10 +116,15 @@ static inline bool timespec_valid_strict(const struct timespec *ts)
 }
 
 extern bool persistent_clock_exist;
+
+#ifdef CONFIG_HAS_PERSISTENT_CLOCK
+#define has_persistent_clock() true
+#else
 static inline bool has_persistent_clock(void)
 {
        return persistent_clock_exist;
 }
+#endif
 
 extern void read_persistent_clock(struct timespec *ts);
 extern void read_boot_clock(struct timespec *ts);

diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 8601f0d..f7e45b9 100644 (file)
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -12,6 +12,11 @@ config CLOCKSOURCE_WATCHDOG
 config ARCH_CLOCKSOURCE_DATA
        bool
 
+# Platforms has a persistent clock
+config HAS_PERSISTENT_CLOCK
+       bool
+       default n
+
 # Timekeeping vsyscall support
 config GENERIC_TIME_VSYSCALL
        bool