workqueue: skip the node_nr_active update for non-unbound workqueuesgrafted

apply_wqattrs_commit() updates node_nr_active->max unconditionally.
wq->node_nr_active[] is only allocated for unbound workqueues, so guard
the call before per-cpu workqueues start using this path.

No functional change: only unbound workqueues reach apply_wqattrs_*()
today.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
new file mode 100644
index 000000000..433aa947c
--- /dev/null
+++ b/fs/proc/uptime.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/time.h>
+#include <linux/time_namespace.h>
+#include <linux/kernel_stat.h>
+#include "internal.h"
+
+static int uptime_proc_show(struct seq_file *m, void *v)
+{
+	struct timespec64 uptime;
+	struct timespec64 idle;
+	u64 idle_nsec;
+	u32 rem;
+	int i;
+
+	idle_nsec = 0;
+	for_each_possible_cpu(i)
+		idle_nsec += kcpustat_field(CPUTIME_IDLE, i);
+
+	ktime_get_boottime_ts64(&uptime);
+	timens_add_boottime(&uptime);
+
+	idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem);
+	idle.tv_nsec = rem;
+	seq_printf(m, "%lu.%02lu %lu.%02lu\n",
+			(unsigned long) uptime.tv_sec,
+			(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
+			(unsigned long) idle.tv_sec,
+			(idle.tv_nsec / (NSEC_PER_SEC / 100)));
+	return 0;
+}
+
+static int __init proc_uptime_init(void)
+{
+	struct proc_dir_entry *pde;
+
+	pde = proc_create_single("uptime", 0, NULL, uptime_proc_show);
+	pde_make_permanent(pde);
+	return 0;
+}
+fs_initcall(proc_uptime_init);