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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/kernel/cpu/resctrl/rdtgroup.c
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@@ -311,7 +311,7 @@
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 	 * executing task might have its own closid selected. Just reuse
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 	 * the context switch code.
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 	 */
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-	resctrl_sched_in();
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+	resctrl_sched_in(current);
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 }
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 /*
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@@ -532,7 +532,7 @@
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 	 * Otherwise, the MSR is updated when the task is scheduled in.
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 	 */
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 	if (task == current)
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-		resctrl_sched_in();
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+		resctrl_sched_in(task);
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 }
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 static void update_task_closid_rmid(struct task_struct *t)
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@@ -563,11 +563,11 @@
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 	 */
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 	if (rdtgrp->type == RDTCTRL_GROUP) {
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-		tsk->closid = rdtgrp->closid;
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-		tsk->rmid = rdtgrp->mon.rmid;
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+		WRITE_ONCE(tsk->closid, rdtgrp->closid);
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+		WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid);
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 	} else if (rdtgrp->type == RDTMON_GROUP) {
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 		if (rdtgrp->mon.parent->closid == tsk->closid) {
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-			tsk->rmid = rdtgrp->mon.rmid;
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+			WRITE_ONCE(tsk->rmid, rdtgrp->mon.rmid);
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 		} else {
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 			rdt_last_cmd_puts("Can't move task to different control group\n");
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 			return -EINVAL;
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@@ -577,8 +577,10 @@
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 	/*
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 	 * Ensure the task's closid and rmid are written before determining if
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 	 * the task is current that will decide if it will be interrupted.
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+	 * This pairs with the full barrier between the rq->curr update and
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+	 * resctrl_sched_in() during context switch.
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 	 */
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-	barrier();
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+	smp_mb();
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 	/*
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 	 * By now, the task's closid and rmid are set. If the task is current
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@@ -713,11 +715,15 @@
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 static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s)
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 {
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 	struct task_struct *p, *t;
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+	pid_t pid;
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719
 
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 	rcu_read_lock();
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 	for_each_process_thread(p, t) {
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-		if (is_closid_match(t, r) || is_rmid_match(t, r))
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-			seq_printf(s, "%d\n", t->pid);
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+		if (is_closid_match(t, r) || is_rmid_match(t, r)) {
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+			pid = task_pid_vnr(t);
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+			if (pid)
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+				seq_printf(s, "%d\n", pid);
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+		}
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 	}
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 	rcu_read_unlock();
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 }
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@@ -2310,22 +2316,26 @@
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 	for_each_process_thread(p, t) {
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 		if (!from || is_closid_match(t, from) ||
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 		    is_rmid_match(t, from)) {
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-			t->closid = to->closid;
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-			t->rmid = to->mon.rmid;
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+			WRITE_ONCE(t->closid, to->closid);
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+			WRITE_ONCE(t->rmid, to->mon.rmid);
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-#ifdef CONFIG_SMP
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 			/*
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-			 * This is safe on x86 w/o barriers as the ordering
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-			 * of writing to task_cpu() and t->on_cpu is
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-			 * reverse to the reading here. The detection is
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-			 * inaccurate as tasks might move or schedule
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-			 * before the smp function call takes place. In
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-			 * such a case the function call is pointless, but
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+			 * Order the closid/rmid stores above before the loads
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+			 * in task_curr(). This pairs with the full barrier
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+			 * between the rq->curr update and resctrl_sched_in()
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+			 * during context switch.
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+			 */
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+			smp_mb();
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+
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+			/*
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+			 * If the task is on a CPU, set the CPU in the mask.
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+			 * The detection is inaccurate as tasks might move or
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+			 * schedule before the smp function call takes place.
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+			 * In such a case the function call is pointless, but
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 			 * there is no other side effect.
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 			 */
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-			if (mask && t->on_cpu)
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+			if (IS_ENABLED(CONFIG_SMP) && mask && task_curr(t))
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 				cpumask_set_cpu(task_cpu(t), mask);
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-#endif
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 		}
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 	}
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 	read_unlock(&tasklist_lock);