tick/timekeeping: Call update_wall_time outside the jiffies lock

Since the xtime lock was split into the timekeeping lock and
the jiffies lock, we no longer need to call update_wall_time()
while holding the jiffies lock.

Thus, this patch splits update_wall_time() out from do_timer().

This allows us to get away from calling clock_was_set_delayed()
in update_wall_time() and instead use the standard clock_was_set()
call that previously would deadlock, as it causes the jiffies lock
to be acquired.

Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>

4 files changed, 7 insertions, 15 deletions

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 64522ecdfe0e..91c5f27e82a3 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -70,6 +70,7 @@ static void tick_periodic(int cpu)
 
                 do_timer(1);
                 write_sequnlock(&jiffies_lock);
+                update_wall_time();
         }
 
         update_process_times(user_mode(get_irq_regs()));
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index e2bced59b6dd..8329669b51ec 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -155,3 +155,4 @@ static inline int tick_device_is_functional(struct clock_event_device *dev)
 #endif
 
 extern void do_timer(unsigned long ticks);
+extern void update_wall_time(void);
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 2afd43fca93b..c58b03d89951 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -86,6 +86,7 @@ static void tick_do_update_jiffies64(ktime_t now)
                 tick_next_period = ktime_add(last_jiffies_update, tick_period);
         }
         write_sequnlock(&jiffies_lock);
+        update_wall_time();
 }
 
 /*
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index d62682b6df4a..44b7e6bb081b 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1360,7 +1360,7 @@ static inline void old_vsyscall_fixup(struct timekeeper *tk)
  * update_wall_time - Uses the current clocksource to increment the wall time
  *
  */
-static void update_wall_time(void)
+void update_wall_time(void)
 {
         struct clocksource *clock;
         struct timekeeper *real_tk = &timekeeper;
@@ -1441,19 +1441,8 @@ static void update_wall_time(void)
         write_seqcount_end(&timekeeper_seq);
 out:
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
-        if (clock_was_set) {
-                /*
-                 * XXX -  I'd rather we just call clock_was_set(), but
-                 * since we're currently holding the jiffies lock, calling
-                 * clock_was_set would trigger an ipi which would then grab
-                 * the jiffies lock and we'd deadlock. :(
-                 * The right solution should probably be droping
-                 * the jiffies lock before calling update_wall_time
-                 * but that requires some rework of the tick sched
-                 * code.
-                 */
-                clock_was_set_delayed();
-        }
+        if (clock_set)
+                clock_was_set();
 }
 
 /**
@@ -1598,7 +1587,6 @@ struct timespec get_monotonic_coarse(void)
 void do_timer(unsigned long ticks)
 {
         jiffies_64 += ticks;
-        update_wall_time();
         calc_global_load(ticks);
 }
 
@@ -1756,4 +1744,5 @@ void xtime_update(unsigned long ticks)
         write_seqlock(&jiffies_lock);
         do_timer(ticks);
         write_sequnlock(&jiffies_lock);
+        update_wall_time();
 }