time: Provide xtime_update()

xtime_update() takes xtime_lock write locked and calls
do_timer(). Provided to replace the do_timer() calls in the
architecture code.

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: <20110127145910.23248.21379.stgit@localhost>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 8da35d1b9e16..02c13a313d15 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -969,3 +969,16 @@ void get_xtime_and_monotonic_offset(struct timespec *xtim, struct timespec *wtom
                 *wtom = wall_to_monotonic;
         } while (read_seqretry(&xtime_lock, seq));
 }
+
+/**
+ * xtime_update() - advances the timekeeping infrastructure
+ * @ticks:      number of ticks, that have elapsed since the last call.
+ *
+ * Must be called with interrupts disabled.
+ */
+void xtime_update(unsigned long ticks)
+{
+        write_seqlock(&xtime_lock);
+        do_timer(ticks);
+        write_sequnlock(&xtime_lock);
+}