@@ -51,6 +51,7 @@ enum tk_offsets {
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
+extern ktime_t ktime_get_coarse_with_offset(enum tk_offsets offs);
extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
extern ktime_t ktime_get_raw(void);
extern u32 ktime_get_resolution_ns(void);
@@ -63,6 +64,11 @@ static inline ktime_t ktime_get_real(void)
return ktime_get_with_offset(TK_OFFS_REAL);
}
+static inline ktime_t ktime_get_coarse_real(void)
+{
+ return ktime_get_coarse_with_offset(TK_OFFS_REAL);
+}
+
/**
* ktime_get_boottime - Returns monotonic time since boot in ktime_t format
*
@@ -74,6 +80,11 @@ static inline ktime_t ktime_get_boottime(void)
return ktime_get_with_offset(TK_OFFS_BOOT);
}
+static inline ktime_t ktime_get_coarse_boottime(void)
+{
+ return ktime_get_coarse_with_offset(TK_OFFS_BOOT);
+}
+
/**
* ktime_get_clocktai - Returns the TAI time of day in ktime_t format
*/
@@ -82,6 +93,11 @@ static inline ktime_t ktime_get_clocktai(void)
return ktime_get_with_offset(TK_OFFS_TAI);
}
+static inline ktime_t ktime_get_coarse_clocktai(void)
+{
+ return ktime_get_coarse_with_offset(TK_OFFS_TAI);
+}
+
/**
* ktime_mono_to_real - Convert monotonic time to clock realtime
*/
@@ -795,6 +795,25 @@ ktime_t ktime_get_with_offset(enum tk_offsets offs)
}
EXPORT_SYMBOL_GPL(ktime_get_with_offset);
+ktime_t ktime_get_coarse_with_offset(enum tk_offsets offs)
+{
+ struct timekeeper *tk = &tk_core.timekeeper;
+ unsigned int seq;
+ ktime_t base, *offset = offsets[offs];
+
+ WARN_ON(timekeeping_suspended);
+
+ do {
+ seq = read_seqcount_begin(&tk_core.seq);
+ base = ktime_add(tk->tkr_mono.base, *offset);
+
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+
+ return base;
+
+}
+EXPORT_SYMBOL_GPL(ktime_get_coarse_with_offset);
+
/**
* ktime_mono_to_any() - convert mononotic time to any other time
* @tmono: time to convert.
I have run into a couple of drivers using current_kernel_time() suffering from the y2038 problem, and they could be converted to using ktime_t, but don't have interfaces that skip the nanosecond calculation at the moment. This introduces ktime_get_coarse_with_offset() as a simpler variant of ktime_get_with_offset(), and adds wrappers for the three time domains we support with the existing function. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- include/linux/timekeeping.h | 16 ++++++++++++++++ kernel/time/timekeeping.c | 19 +++++++++++++++++++ 2 files changed, 35 insertions(+) -- 2.9.0