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| author | Feng Tang | 2013-01-15 17:09:49 +0100 |
|---|---|---|
| committer | John Stultz | 2013-01-16 03:16:08 +0100 |
| commit | 05ad717c77b1b8e98a1dd768c3700036d634629e (patch) | |
| tree | c52d75ca925bcd9b4c7125aad4c1059d7d3a43ee /include/linux/time.h | |
| parent | rtc: Skip the suspend/resume handling if persistent clock exist (diff) | |
| download | kernel-qcow2-linux-05ad717c77b1b8e98a1dd768c3700036d634629e.tar.gz kernel-qcow2-linux-05ad717c77b1b8e98a1dd768c3700036d634629e.tar.xz kernel-qcow2-linux-05ad717c77b1b8e98a1dd768c3700036d634629e.zip | |
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>
Diffstat (limited to 'include/linux/time.h')
| -rw-r--r-- | include/linux/time.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h index dfbc4e82e8ba..369b6e3b87d8 100644 --- 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); |