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sched/smt: Introduce sched_smt_present_inc/dec() helper

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BugLink: https://bugs.launchpad.net/bugs/2083656

commit 31b164e2e4af84d08d2498083676e7eeaa102493 upstream.

Introduce sched_smt_present_inc/dec() helper, so it can be called
in normal or error path simply. No functional changed.

Cc: stable@kernel.org
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240703031610.587047-2-yangyingliang@huaweicloud.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Yang Yingliang
2024-07-03 11:16:07 +08:00
committed by Mehmet Basaran
parent 8e8c308f8e
commit af7f768f45
1 changed files with 19 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/sched/core.c
+19 -7
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@@ -9635,6 +9635,22 @@ static int cpuset_cpu_inactive(unsigned int cpu)
return 0;
}
static inline void sched_smt_present_inc(int cpu)
{
#ifdef CONFIG_SCHED_SMT
if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
static_branch_inc_cpuslocked(&sched_smt_present);
#endif
}
static inline void sched_smt_present_dec(int cpu)
{
#ifdef CONFIG_SCHED_SMT
if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
static_branch_dec_cpuslocked(&sched_smt_present);
#endif
}
int sched_cpu_activate(unsigned int cpu)
{
struct rq *rq = cpu_rq(cpu);
@@ -9646,13 +9662,10 @@ int sched_cpu_activate(unsigned int cpu)
*/
balance_push_set(cpu, false);
#ifdef CONFIG_SCHED_SMT
/*
* When going up, increment the number of cores with SMT present.
*/
if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
static_branch_inc_cpuslocked(&sched_smt_present);
#endif
sched_smt_present_inc(cpu);
set_cpu_active(cpu, true);
if (sched_smp_initialized) {
@@ -9721,13 +9734,12 @@ int sched_cpu_deactivate(unsigned int cpu)
}
rq_unlock_irqrestore(rq, &rf);
#ifdef CONFIG_SCHED_SMT
/*
* When going down, decrement the number of cores with SMT present.
*/
if (cpumask_weight(cpu_smt_mask(cpu)) == 2)
static_branch_dec_cpuslocked(&sched_smt_present);
sched_smt_present_dec(cpu);
#ifdef CONFIG_SCHED_SMT
sched_core_cpu_deactivate(cpu);
#endif