sched/core: Reset RQCF_ACT_SKIP before unpinning rq->lock

rq_clock() is called from sched_info_{depart,arrive}() after resetting
RQCF_ACT_SKIP but prior to a call to update_rq_clock().

In preparation for pending patches that check whether the rq clock has
been updated inside of a pin context before rq_clock() is called, move
the reset of rq->clock_skip_update immediately before unpinning the rq
lock.

This will avoid the new warnings which check if update_rq_clock() is
being actively skipped.

Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luca Abeni <luca.abeni@unitn.it>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yuyang Du <yuyang.du@intel.com>
Link: http://lkml.kernel.org/r/20160921133813.31976-6-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 41df935..311460b 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2887,6 +2887,9 @@ context_switch(struct rq *rq, struct task_struct *prev,
                prev->active_mm = NULL;
                rq->prev_mm = oldmm;
        }
+
+       rq->clock_skip_update = 0;
+
        /*
         * Since the runqueue lock will be released by the next
         * task (which is an invalid locking op but in the case
@@ -3392,7 +3395,6 @@ static void __sched notrace __schedule(bool preempt)
        next = pick_next_task(rq, prev, &rf);
        clear_tsk_need_resched(prev);
        clear_preempt_need_resched();
-       rq->clock_skip_update = 0;
 
        if (likely(prev != next)) {
                rq->nr_switches++;
@@ -3402,6 +3404,7 @@ static void __sched notrace __schedule(bool preempt)
                trace_sched_switch(preempt, prev, next);
                rq = context_switch(rq, prev, next, &rf); /* unlocks the rq */
        } else {
+               rq->clock_skip_update = 0;
                rq_unpin_lock(rq, &rf);
                raw_spin_unlock_irq(&rq->lock);
        }