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authorThomas Gleixner <tglx@linutronix.de>2014-07-16 21:04:13 +0000
committerJohn Stultz <john.stultz@linaro.org>2014-07-23 10:17:58 -0700
commit0077dc60f274b9a7e9aa705a34784fefb87e0eee (patch)
treea4ec63fa3836caf78a9cc6c3bf484bbf883f610d /kernel/time
parenta016a5bd62e29a738531d9d4d925037a1fdb52f5 (diff)
downloadop-kernel-dev-0077dc60f274b9a7e9aa705a34784fefb87e0eee.zip
op-kernel-dev-0077dc60f274b9a7e9aa705a34784fefb87e0eee.tar.gz
timekeeping: Provide ktime_get_with_offset()
Provide a helper function which lets us implement ktime_t based interfaces for real, boot and tai clocks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/timekeeping.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index d5be142..7c5f5e4 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -423,6 +423,33 @@ ktime_t ktime_get(void)
}
EXPORT_SYMBOL_GPL(ktime_get);
+static ktime_t *offsets[TK_OFFS_MAX] = {
+ [TK_OFFS_REAL] = &tk_core.timekeeper.offs_real,
+ [TK_OFFS_BOOT] = &tk_core.timekeeper.offs_boot,
+ [TK_OFFS_TAI] = &tk_core.timekeeper.offs_tai,
+};
+
+ktime_t ktime_get_with_offset(enum tk_offsets offs)
+{
+ struct timekeeper *tk = &tk_core.timekeeper;
+ unsigned int seq;
+ ktime_t base, *offset = offsets[offs];
+ s64 nsecs;
+
+ WARN_ON(timekeeping_suspended);
+
+ do {
+ seq = read_seqcount_begin(&tk_core.seq);
+ base = ktime_add(tk->base_mono, *offset);
+ nsecs = timekeeping_get_ns(tk);
+
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+
+ return ktime_add_ns(base, nsecs);
+
+}
+EXPORT_SYMBOL_GPL(ktime_get_with_offset);
+
/**
* ktime_get_ts64 - get the monotonic clock in timespec64 format
* @ts: pointer to timespec variable
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