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Date: Mon, 18 Feb 2019 17:56:34 +0100 From: Peter Zijlstra <peterz@...radead.org> To: mingo@...nel.org, tglx@...utronix.de, pjt@...gle.com, tim.c.chen@...ux.intel.com, torvalds@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, subhra.mazumdar@...cle.com, fweisbec@...il.com, keescook@...omium.org, kerrnel@...gle.com, "Peter Zijlstra (Intel)" <peterz@...radead.org> Subject: [RFC][PATCH 14/16] sched/fair: Add a few assertions Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> --- kernel/sched/fair.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6208,6 +6208,11 @@ static int select_idle_sibling(struct ta struct sched_domain *sd; int i, recent_used_cpu; + /* + * per-cpu select_idle_mask usage + */ + lockdep_assert_irqs_disabled(); + if (available_idle_cpu(target)) return target; @@ -6635,8 +6640,6 @@ static int find_energy_efficient_cpu(str * certain conditions an idle sibling CPU if the domain has SD_WAKE_AFFINE set. * * Returns the target CPU number. - * - * preempt must be disabled. */ static int select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_flags) @@ -6647,6 +6650,11 @@ select_task_rq_fair(struct task_struct * int want_affine = 0; int sync = (wake_flags & WF_SYNC) && !(current->flags & PF_EXITING); + /* + * required for stable ->cpus_allowed + */ + lockdep_assert_held(&p->pi_lock); + if (sd_flag & SD_BALANCE_WAKE) { record_wakee(p);
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