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 checking this. Fixes: 0826530de3cb ("sched/fair: Remove update of blocked load from newidle_balance") Signed-off-by: YueHaibing <yuehaib...@huawei.com> Reviewed-by: Vincent Guittot <vincent.guit...@linaro.org> --- v2: Add Fixes tag, also move update_nohz_stats() closer to its only caller _nohz_idle_balance() --- 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..2a20ada83cbb 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. @@ -10380,6 +10358,24 @@ void nohz_balance_enter_idle(int cpu) WRITE_ONCE(nohz.has_blocked, 1); } +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; +} + /* * Internal function that runs load balance for all idle cpus. The load balance * can be a simple update of blocked load or a complete load balance with -- 2.17.1