diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index bcc80269bb6ac6cc2492b128fd5e167254350737..341a6c2340d5789f989a60e93077ba6a2d76948d 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -714,9 +714,7 @@ Conventions
 - Settings for a single feature should be contained in a single file.
 
 - The root cgroup should be exempt from resource control and thus
-  shouldn't have resource control interface files.  Also,
-  informational files on the root cgroup which end up showing global
-  information available elsewhere shouldn't exist.
+  shouldn't have resource control interface files.
 
 - The default time unit is microseconds.  If a different unit is ever
   used, an explicit unit suffix must be present.
@@ -985,7 +983,7 @@ CPU Interface Files
 All time durations are in microseconds.
 
   cpu.stat
-	A read-only flat-keyed file which exists on non-root cgroups.
+	A read-only flat-keyed file.
 	This file exists whether the controller is enabled or not.
 
 	It always reports the following three stats:
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 7a016749de21b7dc6e3cf4a5b03cc4432258446d..51924ebdff518b72d4d8a025afb2b5e0eaadab62 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4874,7 +4874,6 @@ static struct cftype cgroup_base_files[] = {
 	},
 	{
 		.name = "cpu.stat",
-		.flags = CFTYPE_NOT_ON_ROOT,
 		.seq_show = cpu_stat_show,
 	},
 #ifdef CONFIG_PSI
diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 41ca996568dfbbfdc9d1e2dc7841ccd6ff819a56..b6397a186ce9c8f0b16c235992231a23dd1acca9 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -389,18 +389,62 @@ void __cgroup_account_cputime_field(struct cgroup *cgrp,
 	cgroup_base_stat_cputime_account_end(cgrp, rstatc);
 }
 
+/*
+ * compute the cputime for the root cgroup by getting the per cpu data
+ * at a global level, then categorizing the fields in a manner consistent
+ * with how it is done by __cgroup_account_cputime_field for each bit of
+ * cpu time attributed to a cgroup.
+ */
+static void root_cgroup_cputime(struct task_cputime *cputime)
+{
+	int i;
+
+	cputime->stime = 0;
+	cputime->utime = 0;
+	cputime->sum_exec_runtime = 0;
+	for_each_possible_cpu(i) {
+		struct kernel_cpustat kcpustat;
+		u64 *cpustat = kcpustat.cpustat;
+		u64 user = 0;
+		u64 sys = 0;
+
+		kcpustat_cpu_fetch(&kcpustat, i);
+
+		user += cpustat[CPUTIME_USER];
+		user += cpustat[CPUTIME_NICE];
+		cputime->utime += user;
+
+		sys += cpustat[CPUTIME_SYSTEM];
+		sys += cpustat[CPUTIME_IRQ];
+		sys += cpustat[CPUTIME_SOFTIRQ];
+		cputime->stime += sys;
+
+		cputime->sum_exec_runtime += user;
+		cputime->sum_exec_runtime += sys;
+		cputime->sum_exec_runtime += cpustat[CPUTIME_STEAL];
+		cputime->sum_exec_runtime += cpustat[CPUTIME_GUEST];
+		cputime->sum_exec_runtime += cpustat[CPUTIME_GUEST_NICE];
+	}
+}
+
 void cgroup_base_stat_cputime_show(struct seq_file *seq)
 {
 	struct cgroup *cgrp = seq_css(seq)->cgroup;
 	u64 usage, utime, stime;
-
-	if (!cgroup_parent(cgrp))
-		return;
-
-	cgroup_rstat_flush_hold(cgrp);
-	usage = cgrp->bstat.cputime.sum_exec_runtime;
-	cputime_adjust(&cgrp->bstat.cputime, &cgrp->prev_cputime, &utime, &stime);
-	cgroup_rstat_flush_release();
+	struct task_cputime cputime;
+
+	if (cgroup_parent(cgrp)) {
+		cgroup_rstat_flush_hold(cgrp);
+		usage = cgrp->bstat.cputime.sum_exec_runtime;
+		cputime_adjust(&cgrp->bstat.cputime, &cgrp->prev_cputime,
+			       &utime, &stime);
+		cgroup_rstat_flush_release();
+	} else {
+		root_cgroup_cputime(&cputime);
+		usage = cputime.sum_exec_runtime;
+		utime = cputime.utime;
+		stime = cputime.stime;
+	}
 
 	do_div(usage, NSEC_PER_USEC);
 	do_div(utime, NSEC_PER_USEC);