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sched/uclamp: Fix a uninitialized variable warnings

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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: 244226035a ("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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20230112122708.330667-2-qyousef@layalina.io
This commit is contained in:
Qais Yousef 2023-01-12 12:27:07 +00:00 committed by Peter Zijlstra
parent 9a5418bc48
commit e26fd28db8
1 changed files with 15 additions and 18 deletions
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33
kernel/sched/fair.c
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@ -7229,10 +7229,10 @@ 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;
@ -7251,6 +7251,8 @@ 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)))
@ -7269,24 +7271,19 @@ 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);
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);
}
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;