Merge tag 'sched_ext-for-6.19-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_extHEADmaster

Pull sched_ext fixes from Tejun Heo:

 - Fix uninitialized @ret on alloc_percpu() failure leading to
   ERR_PTR(0)

 - Fix PREEMPT_RT warning when bypass load balancer sends IPI to offline
   CPU by using resched_cpu() instead of resched_curr()

 - Fix comment referring to renamed function

 - Update scx_show_state.py for scx_root and scx_aborting changes

* tag 'sched_ext-for-6.19-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  tools/sched_ext: update scx_show_state.py for scx_aborting change
  tools/sched_ext: fix scx_show_state.py for scx_root change
  sched_ext: Use the resched_cpu() to replace resched_curr() in the bypass_lb_node()
  sched_ext: Fix some comments in ext.c
  sched_ext: fix uninitialized ret on alloc_percpu() failure

1 files changed, 10 insertions, 13 deletions

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 94164f2dec6d..8f6d8d7f895c 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1577,7 +1577,7 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int deq_flags
 	 *
 	 * @p may go through multiple stopping <-> running transitions between
 	 * here and put_prev_task_scx() if task attribute changes occur while
-	 * balance_scx() leaves @rq unlocked. However, they don't contain any
+	 * balance_one() leaves @rq unlocked. However, they don't contain any
 	 * information meaningful to the BPF scheduler and can be suppressed by
 	 * skipping the callbacks if the task is !QUEUED.
 	 */
@@ -2372,7 +2372,7 @@ static void switch_class(struct rq *rq, struct task_struct *next)
 	 * preempted, and it regaining control of the CPU.
 	 *
 	 * ->cpu_release() complements ->cpu_acquire(), which is emitted the
-	 *  next time that balance_scx() is invoked.
+	 *  next time that balance_one() is invoked.
 	 */
 	if (!rq->scx.cpu_released) {
 		if (SCX_HAS_OP(sch, cpu_release)) {
@@ -2478,7 +2478,7 @@ do_pick_task_scx(struct rq *rq, struct rq_flags *rf, bool force_scx)
 	}
 
 	/*
-	 * If balance_scx() is telling us to keep running @prev, replenish slice
+	 * If balance_one() is telling us to keep running @prev, replenish slice
 	 * if necessary and keep running @prev. Otherwise, pop the first one
 	 * from the local DSQ.
 	 */
@@ -3956,13 +3956,8 @@ static void bypass_lb_node(struct scx_sched *sch, int node)
 					     nr_donor_target, nr_target);
 	}
 
-	for_each_cpu(cpu, resched_mask) {
-		struct rq *rq = cpu_rq(cpu);
-
-		raw_spin_rq_lock_irq(rq);
-		resched_curr(rq);
-		raw_spin_rq_unlock_irq(rq);
-	}
+	for_each_cpu(cpu, resched_mask)
+		resched_cpu(cpu);
 
 	for_each_cpu_and(cpu, cpu_online_mask, node_mask) {
 		u32 nr = READ_ONCE(cpu_rq(cpu)->scx.bypass_dsq.nr);
@@ -4025,7 +4020,7 @@ static DEFINE_TIMER(scx_bypass_lb_timer, scx_bypass_lb_timerfn);
  *
  * - ops.dispatch() is ignored.
  *
- * - balance_scx() does not set %SCX_RQ_BAL_KEEP on non-zero slice as slice
+ * - balance_one() does not set %SCX_RQ_BAL_KEEP on non-zero slice as slice
  *   can't be trusted. Whenever a tick triggers, the running task is rotated to
  *   the tail of the queue with core_sched_at touched.
  *
@@ -4783,8 +4778,10 @@ static struct scx_sched *scx_alloc_and_add_sched(struct sched_ext_ops *ops)
 	}
 
 	sch->pcpu = alloc_percpu(struct scx_sched_pcpu);
-	if (!sch->pcpu)
+	if (!sch->pcpu) {
+		ret = -ENOMEM;
 		goto err_free_gdsqs;
+	}
 
 	sch->helper = kthread_run_worker(0, "sched_ext_helper");
 	if (IS_ERR(sch->helper)) {
@@ -6067,7 +6064,7 @@ __bpf_kfunc bool scx_bpf_dsq_move_to_local(u64 dsq_id)
 		/*
 		 * A successfully consumed task can be dequeued before it starts
 		 * running while the CPU is trying to migrate other dispatched
-		 * tasks. Bump nr_tasks to tell balance_scx() to retry on empty
+		 * tasks. Bump nr_tasks to tell balance_one() to retry on empty
 		 * local DSQ.
 		 */
 		dspc->nr_tasks++;