[PATCH RFC v2 3/8] SUNRPC: Set WQ_SYSFS on rpciod and xprtiod

[Chuck Lever]

An unbound workqueue's attributes can be changed at run time only
through /sys/devices/virtual/workqueue/, and a workqueue appears
there only when it is created with WQ_SYSFS. rpciod and xprtiod are
created without it, so their affinity scope cannot be tuned without
reloading the sunrpc module.

Create both with WQ_SYSFS.

Signed-off-by: Chuck Lever <cel@xxxxxxxxxx>
---
 net/sunrpc/sched.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 016f16ca5779..e81419aa553c 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -1273,16 +1273,17 @@ void rpciod_down(void)
  */
 static int rpciod_start(void)
 {
+	const unsigned int wq_flags = WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_SYSFS;
 	struct workqueue_struct *wq;
 
 	/*
 	 * Create the rpciod thread and wait for it to start.
 	 */
-	wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
+	wq = alloc_workqueue("rpciod", wq_flags, 0);
 	if (!wq)
 		goto out_failed;
 	rpciod_workqueue = wq;
-	wq = alloc_workqueue("xprtiod", WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
+	wq = alloc_workqueue("xprtiod", wq_flags, 0);
 	if (!wq)
 		goto free_rpciod;
 	xprtiod_workqueue = wq;

-- 
2.55.0