time: Provide get_xtime_and_monotonic_offset()
The hrtimer code accesses timekeeping variables under
xtime_lock. Provide a sensible accessor function and use it.
[ tglx: Removed the conditionals, unused variable, fixed codingstyle
and massaged changelog ]
Signed-off-by: Torben Hohn <torbenh@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: johnstul@us.ibm.com
Cc: yong.zhang0@gmail.com
Cc: hch@infradead.org
LKML-Reference: <20110127145905.23248.30458.stgit@localhost>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 0c8d7c0..57c4d33 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -85,13 +85,8 @@
{
ktime_t xtim, tomono;
struct timespec xts, tom;
- unsigned long seq;
- do {
- seq = read_seqbegin(&xtime_lock);
- xts = __current_kernel_time();
- tom = __get_wall_to_monotonic();
- } while (read_seqretry(&xtime_lock, seq));
+ get_xtime_and_monotonic_offset(&xts, &tom);
xtim = timespec_to_ktime(xts);
tomono = timespec_to_ktime(tom);
@@ -612,15 +607,11 @@
{
struct hrtimer_cpu_base *base;
struct timespec realtime_offset, wtm;
- unsigned long seq;
if (!hrtimer_hres_active())
return;
- do {
- seq = read_seqbegin(&xtime_lock);
- wtm = __get_wall_to_monotonic();
- } while (read_seqretry(&xtime_lock, seq));
+ get_xtime_and_monotonic_offset(&realtime_offset, &wtm);
set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
base = &__get_cpu_var(hrtimer_bases);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index c1a178c..c50aaf6 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -958,3 +958,19 @@
update_wall_time();
calc_global_load(ticks);
}
+
+/**
+ * get_xtime_and_monotonic_offset() - get xtime and wall_to_monotonic
+ * @xtim: pointer to timespec to be set with xtime
+ * @wtom: pointer to timespec to be set with wall_to_monotonic
+ */
+void get_xtime_and_monotonic_offset(struct timespec *xtim, struct timespec *wtom)
+{
+ unsigned long seq;
+
+ do {
+ seq = read_seqbegin(&xtime_lock);
+ *xtim = xtime;
+ *wtom = wall_to_monotonic;
+ } while (read_seqretry(&xtime_lock, seq));
+}