Unverified Commit e7454d7c authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!12007 Fix CVE-2024-44958 for 4.19 

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Zucheng <zhengzucheng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/F3DYVR47K6ZMEJH6HNT64WX5SXXHKBNS/ 
Yang Yingliang (2):
  sched/smt: Introduce sched_smt_present_inc/dec() helper
  sched/smt: Fix unbalance sched_smt_present dec/inc

Zheng Zucheng (1):
  sched: Revert fix unbalance sched_smt_present dec/inc


-- 
2.34.1
 
https://gitee.com/src-openeuler/kernel/issues/IAOXYI 
 
Link:https://gitee.com/openeuler/kernel/pulls/12007

 

Reviewed-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
parents 14558c56 7d01838c

kernel/sched/core.c

+19 −12
Original line number Diff line number Diff line
@@ -5831,18 +5831,31 @@ 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);

	struct rq_flags rf;



#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);

	tg_update_affinity_domains(cpu, 1);
@@ -5886,23 +5899,17 @@ int sched_cpu_deactivate(unsigned int cpu) 
	 */

	synchronize_rcu_mult(call_rcu, call_rcu_sched);



#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);

#endif

	sched_smt_present_dec(cpu);



	if (!sched_smp_initialized)

		return 0;



	ret = cpuset_cpu_inactive(cpu);

	if (ret) {

#ifdef CONFIG_SCHED_SMT

		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);

		return ret;

	}