Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-6.11

d329605287 ("sched/fair: set_load_weight() must also call reweight_task()
for SCHED_IDLE tasks") applied to sched/core changes how reweight_task() is
called causing conflicts with e83edbf88f ("sched: Add
sched_class->reweight_task()"). Resolve the conflicts by taking
set_load_weight() changes from d329605287 and updating
sched_class->reweight_task() to take pointer to struct load_weight instead
of int prio.

Signed-off-by: Tejun Heo<tj@kernel.org>

kernel/sched/core.c

@@ -1339,27 +1339,24 @@ int tg_nop(struct task_group *tg, void *data)
 void set_load_weight(struct task_struct *p, bool update_load)
 {
 	int prio = p->static_prio - MAX_RT_PRIO;
-	struct load_weight *load = &p->se.load;
+	struct load_weight lw;
 
-	/*
-	 * SCHED_IDLE tasks get minimal weight:
-	 */
 	if (task_has_idle_policy(p)) {
-		load->weight = scale_load(WEIGHT_IDLEPRIO);
-		load->inv_weight = WMULT_IDLEPRIO;
-		return;
+		lw.weight = scale_load(WEIGHT_IDLEPRIO);
+		lw.inv_weight = WMULT_IDLEPRIO;
+	} else {
+		lw.weight = scale_load(sched_prio_to_weight[prio]);
+		lw.inv_weight = sched_prio_to_wmult[prio];
 	}
 
 	/*
 	 * SCHED_OTHER tasks have to update their load when changing their
 	 * weight
 	 */
-	if (update_load && p->sched_class->reweight_task) {
-		p->sched_class->reweight_task(task_rq(p), p, prio);
-	} else {
-		load->weight = scale_load(sched_prio_to_weight[prio]);
-		load->inv_weight = sched_prio_to_wmult[prio];
-	}
+	if (update_load && p->sched_class->reweight_task)
+		p->sched_class->reweight_task(task_rq(p), p, &lw);
+	else
+		p->se.load = lw;
 }
 
 #ifdef CONFIG_UCLAMP_TASK

kernel/sched/ext.c

@@ -3403,7 +3403,8 @@ void sched_ext_free(struct task_struct *p)
 	}
 }
 
-static void reweight_task_scx(struct rq *rq, struct task_struct *p, int newprio)
+static void reweight_task_scx(struct rq *rq, struct task_struct *p,
+			      const struct load_weight *lw)
 {
 	lockdep_assert_rq_held(task_rq(p));
 

kernel/sched/fair.c

@@ -3835,15 +3835,15 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
 	}
 }
 
-static void reweight_task_fair(struct rq *rq, struct task_struct *p, int prio)
+static void reweight_task_fair(struct rq *rq, struct task_struct *p,
+			       const struct load_weight *lw)
 {
 	struct sched_entity *se = &p->se;
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 	struct load_weight *load = &se->load;
-	unsigned long weight = scale_load(sched_prio_to_weight[prio]);
 
-	reweight_entity(cfs_rq, se, weight);
-	load->inv_weight = sched_prio_to_wmult[prio];
+	reweight_entity(cfs_rq, se, lw->weight);
+	load->inv_weight = lw->inv_weight;
 }
 
 static inline int throttled_hierarchy(struct cfs_rq *cfs_rq);

kernel/sched/psi.c

@@ -218,28 +218,32 @@ void __init psi_init(void)
 	group_init(&psi_system);
 }
 
-static bool test_state(unsigned int *tasks, enum psi_states state, bool oncpu)
+static u32 test_states(unsigned int *tasks, u32 state_mask)
 {
-	switch (state) {
-	case PSI_IO_SOME:
-		return unlikely(tasks[NR_IOWAIT]);
-	case PSI_IO_FULL:
-		return unlikely(tasks[NR_IOWAIT] && !tasks[NR_RUNNING]);
-	case PSI_MEM_SOME:
-		return unlikely(tasks[NR_MEMSTALL]);
-	case PSI_MEM_FULL:
-		return unlikely(tasks[NR_MEMSTALL] &&
-			tasks[NR_RUNNING] == tasks[NR_MEMSTALL_RUNNING]);
-	case PSI_CPU_SOME:
-		return unlikely(tasks[NR_RUNNING] > oncpu);
-	case PSI_CPU_FULL:
-		return unlikely(tasks[NR_RUNNING] && !oncpu);
-	case PSI_NONIDLE:
-		return tasks[NR_IOWAIT] || tasks[NR_MEMSTALL] ||
-			tasks[NR_RUNNING];
-	default:
-		return false;
+	const bool oncpu = state_mask & PSI_ONCPU;
+
+	if (tasks[NR_IOWAIT]) {
+		state_mask |= BIT(PSI_IO_SOME);
+		if (!tasks[NR_RUNNING])
+			state_mask |= BIT(PSI_IO_FULL);
 	}
+
+	if (tasks[NR_MEMSTALL]) {
+		state_mask |= BIT(PSI_MEM_SOME);
+		if (tasks[NR_RUNNING] == tasks[NR_MEMSTALL_RUNNING])
+			state_mask |= BIT(PSI_MEM_FULL);
+	}
+
+	if (tasks[NR_RUNNING] > oncpu)
+		state_mask |= BIT(PSI_CPU_SOME);
+
+	if (tasks[NR_RUNNING] && !oncpu)
+		state_mask |= BIT(PSI_CPU_FULL);
+
+	if (tasks[NR_IOWAIT] || tasks[NR_MEMSTALL] || tasks[NR_RUNNING])
+		state_mask |= BIT(PSI_NONIDLE);
+
+	return state_mask;
 }
 
 static void get_recent_times(struct psi_group *group, int cpu,
@@ -770,7 +774,6 @@ static void psi_group_change(struct psi_group *group, int cpu,
 {
 	struct psi_group_cpu *groupc;
 	unsigned int t, m;
-	enum psi_states s;
 	u32 state_mask;
 
 	groupc = per_cpu_ptr(group->pcpu, cpu);
@@ -841,10 +844,7 @@ static void psi_group_change(struct psi_group *group, int cpu,
 		return;
 	}
 
-	for (s = 0; s < NR_PSI_STATES; s++) {
-		if (test_state(groupc->tasks, s, state_mask & PSI_ONCPU))
-			state_mask |= (1 << s);
-	}
+	state_mask = test_states(groupc->tasks, state_mask);
 
 	/*
 	 * Since we care about lost potential, a memstall is FULL
@@ -1194,7 +1194,7 @@ void psi_cgroup_restart(struct psi_group *group)
 	/*
 	 * After we disable psi_group->enabled, we don't actually
 	 * stop percpu tasks accounting in each psi_group_cpu,
-	 * instead only stop test_state() loop, record_times()
+	 * instead only stop test_states() loop, record_times()
 	 * and averaging worker, see psi_group_change() for details.
 	 *
 	 * When disable cgroup PSI, this function has nothing to sync
@@ -1202,7 +1202,7 @@ void psi_cgroup_restart(struct psi_group *group)
 	 * would see !psi_group->enabled and only do task accounting.
 	 *
 	 * When re-enable cgroup PSI, this function use psi_group_change()
-	 * to get correct state mask from test_state() loop on tasks[],
+	 * to get correct state mask from test_states() loop on tasks[],
 	 * and restart groupc->state_start from now, use .clear = .set = 0
 	 * here since no task status really changed.
 	 */

kernel/sched/sched.h

@@ -2389,7 +2389,7 @@ struct sched_class {
 	void (*switched_from)(struct rq *this_rq, struct task_struct *task);
 	void (*switched_to)  (struct rq *this_rq, struct task_struct *task);
 	void (*reweight_task)(struct rq *this_rq, struct task_struct *task,
-			      int newprio);
+			      const struct load_weight *lw);
 	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
 			      int oldprio);