tick: Remove useless timekeeping duty attribution to broadcast source

Since 7300711e ("clockevents: broadcast fixup possible waiters"),
the timekeeping duty is assigned to the CPU that handles the tick
broadcast clock device by the time it is set in one shot mode.

This is an issue in full dynticks mode where the timekeeping duty
must stay handled by the boot CPU for now. Otherwise it prevents
secondary CPUs from offlining and this breaks
suspend/shutdown/reboot/...

As it appears there is no reason for this timekeeping duty to be
moved to the broadcast CPU, besides nothing prevent it from being
later re-assigned to another target, let's simply remove it.

Signed-off-by: Jiri Bohac <[email protected]>
Reported-by: Steven Rostedt <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Borislav Petkov <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 0c739423b0f9c5728de497e5391730e417536e61..b4c245580b792df082e2b4d2b9601d5b5e6565dc 100644 (file)
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -698,10 +698,6 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
 
                bc->event_handler = tick_handle_oneshot_broadcast;
 
-               /* Take the do_timer update */
-               if (!tick_nohz_full_cpu(cpu))
-                       tick_do_timer_cpu = cpu;
-
                /*
                 * We must be careful here. There might be other CPUs
                 * waiting for periodic broadcast. We need to set the