diff options
author | Feng Tang <feng.tang@intel.com> | 2013-01-15 17:09:47 +0100 |
---|---|---|
committer | John Stultz <john.stultz@linaro.org> | 2013-01-16 03:16:07 +0100 |
commit | 31ade30692dc9680bfc95700d794818fa3f754ac (patch) | |
tree | cb436c839b890d04f589b49f75cb0df59315158e /include | |
parent | posix-timers: Fix clock_adjtime to always return timex data on success (diff) | |
download | linux-31ade30692dc9680bfc95700d794818fa3f754ac.tar.xz linux-31ade30692dc9680bfc95700d794818fa3f754ac.zip |
timekeeping: Add persistent_clock_exist flag
In current kernel, there are several places which need to check
whether there is a persistent clock for the platform. Current check
is done by calling the read_persistent_clock() and validating its
return value.
So one optimization is to do the check only once in timekeeping_init(),
and use a flag persistent_clock_exist to record it.
v2: Add a has_persistent_clock() helper function, as suggested by John.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/time.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h index 0015aea4c4a7..dfbc4e82e8ba 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -115,6 +115,12 @@ static inline bool timespec_valid_strict(const struct timespec *ts) return true; } +extern bool persistent_clock_exist; +static inline bool has_persistent_clock(void) +{ + return persistent_clock_exist; +} + extern void read_persistent_clock(struct timespec *ts); extern void read_boot_clock(struct timespec *ts); extern int update_persistent_clock(struct timespec now); |