From 92509b732baf14c59ca702307270cfaa3a585ae7 Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Wed, 21 Sep 2016 14:38:11 +0100 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra (Intel) Cc: Byungchul Park Cc: Frederic Weisbecker Cc: Jan Kara Cc: Linus Torvalds Cc: Luca Abeni Cc: Mel Gorman Cc: Mike Galbraith Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Petr Mladek Cc: Rik van Riel Cc: Sergey Senozhatsky Cc: Thomas Gleixner Cc: Wanpeng Li Cc: Yuyang Du Link: http://lkml.kernel.org/r/20160921133813.31976-6-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 41df935180ea..311460b46d68 100644 --- 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); } -- 2.20.1