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SubjectRe: [PATCH v3 1/2] sched/uclamp: Fix a uninitialized variable warnings
On Thu, 12 Jan 2023 at 13:27, Qais Yousef <qyousef@layalina.io> wrote:
>
> Addresses the following warnings:
>
> > config: riscv-randconfig-m031-20221111
> > compiler: riscv64-linux-gcc (GCC) 12.1.0
> >
> > smatch warnings:
> > kernel/sched/fair.c:7263 find_energy_efficient_cpu() error: uninitialized symbol 'util_min'.
> > kernel/sched/fair.c:7263 find_energy_efficient_cpu() error: uninitialized symbol 'util_max'.
>
> Fixes: 244226035a1f ("sched/uclamp: Fix fits_capacity() check in feec()")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <error27@gmail.com>
> Signed-off-by: Qais Yousef (Google) <qyousef@layalina.io>

Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>

> ---
> kernel/sched/fair.c | 35 ++++++++++++++++-------------------
> 1 file changed, 16 insertions(+), 19 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index e9d906a9bba9..5a8e75d4a17b 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7353,10 +7353,10 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
> eenv_task_busy_time(&eenv, p, prev_cpu);
>
> for (; pd; pd = pd->next) {
> + unsigned long util_min = p_util_min, util_max = p_util_max;
> unsigned long cpu_cap, cpu_thermal_cap, util;
> unsigned long cur_delta, max_spare_cap = 0;
> unsigned long rq_util_min, rq_util_max;
> - unsigned long util_min, util_max;
> unsigned long prev_spare_cap = 0;
> int max_spare_cap_cpu = -1;
> unsigned long base_energy;
> @@ -7375,6 +7375,8 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
> eenv.pd_cap = 0;
>
> for_each_cpu(cpu, cpus) {
> + struct rq *rq = cpu_rq(cpu);
> +
> eenv.pd_cap += cpu_thermal_cap;
>
> if (!cpumask_test_cpu(cpu, sched_domain_span(sd)))
> @@ -7393,24 +7395,19 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
> * much capacity we can get out of the CPU; this is
> * aligned with sched_cpu_util().
> */
> - if (uclamp_is_used()) {
> - if (uclamp_rq_is_idle(cpu_rq(cpu))) {
> - util_min = p_util_min;
> - util_max = p_util_max;
> - } else {
> - /*
> - * Open code uclamp_rq_util_with() except for
> - * the clamp() part. Ie: apply max aggregation
> - * only. util_fits_cpu() logic requires to
> - * operate on non clamped util but must use the
> - * max-aggregated uclamp_{min, max}.
> - */
> - rq_util_min = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MIN);
> - rq_util_max = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MAX);
> -
> - util_min = max(rq_util_min, p_util_min);
> - util_max = max(rq_util_max, p_util_max);
> - }
> + if (uclamp_is_used() && !uclamp_rq_is_idle(rq)) {
> + /*
> + * Open code uclamp_rq_util_with() except for
> + * the clamp() part. Ie: apply max aggregation
> + * only. util_fits_cpu() logic requires to
> + * operate on non clamped util but must use the
> + * max-aggregated uclamp_{min, max}.
> + */
> + rq_util_min = uclamp_rq_get(rq, UCLAMP_MIN);
> + rq_util_max = uclamp_rq_get(rq, UCLAMP_MAX);
> +
> + util_min = max(rq_util_min, p_util_min);
> + util_max = max(rq_util_max, p_util_max);
> }
> if (!util_fits_cpu(util, util_min, util_max, cpu))
> continue;
> --
> 2.25.1
>

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