Hi, On Sat, 27 Mar 2021 at 14:59, YueHaibing <yuehaib...@huawei.com> wrote: > > while CONFIG_NO_HZ_COMMON is not enabled, gcc warn this: > > kernel/sched/fair.c:8398:13: warning: ‘update_nohz_stats’ defined but not > used [-Wunused-function] > static bool update_nohz_stats(struct rq *rq) > ^~~~~~~~~~~~~~~~~ > > Move update_nohz_stats() to #ifdef block fix this.
Could you add a fix tag ? Fixes: 0826530de3cb ("sched/fair: Remove update of blocked load from newidle_balance") Also could you move update_nohz_stats() closer to its only caller _nohz_idle_balance() With these small nits above: Reviewed-by: Vincent Guittot <vincent.guit...@linaro.org> > > Signed-off-by: YueHaibing <yuehaib...@huawei.com> > --- > kernel/sched/fair.c | 40 ++++++++++++++++++---------------------- > 1 file changed, 18 insertions(+), 22 deletions(-) > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > index 6d73bdbb2d40..c7a7ef97d167 100644 > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -8395,28 +8395,6 @@ group_type group_classify(unsigned int imbalance_pct, > return group_has_spare; > } > > -static bool update_nohz_stats(struct rq *rq) > -{ > -#ifdef CONFIG_NO_HZ_COMMON > - unsigned int cpu = rq->cpu; > - > - if (!rq->has_blocked_load) > - return false; > - > - if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask)) > - return false; > - > - if (!time_after(jiffies, > READ_ONCE(rq->last_blocked_load_update_tick))) > - return true; > - > - update_blocked_averages(cpu); > - > - return rq->has_blocked_load; > -#else > - return false; > -#endif > -} > - > /** > * update_sg_lb_stats - Update sched_group's statistics for load balancing. > * @env: The load balancing environment. > @@ -10097,6 +10075,24 @@ static inline int on_null_domain(struct rq *rq) > } > > #ifdef CONFIG_NO_HZ_COMMON > +static bool update_nohz_stats(struct rq *rq) > +{ > + unsigned int cpu = rq->cpu; > + > + if (!rq->has_blocked_load) > + return false; > + > + if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask)) > + return false; > + > + if (!time_after(jiffies, > READ_ONCE(rq->last_blocked_load_update_tick))) > + return true; > + > + update_blocked_averages(cpu); > + > + return rq->has_blocked_load; > +} > + > /* > * idle load balancing details > * - When one of the busy CPUs notice that there may be an idle rebalancing > -- > 2.17.1 >