xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

timekeeping: Add persistent_clock_exist flag

Browse Source 
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>
This commit is contained in:
Feng Tang
2013-01-16 00:09:47 +08:00
committed by John Stultz
parent f0dbe81f0e
commit 31ade30692
2 changed files with 17 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/time.h
View File

@@ -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);