workqueue: Make default affinity_scope dynamically updatable

While workqueue.default_affinity_scope is writable, it only affects
workqueues which are created afterwards and isn't very useful. Instead,
let's introduce explicit "default" scope and update the effective scope
dynamically when workqueue.default_affinity_scope is changed.

Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 732c5c7e3fa5..98ffce100a39 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -7014,10 +7014,10 @@
 			information, see the Affinity Scopes section in
 			Documentation/core-api/workqueue.rst.
 
-			This can be updated after boot through the matching
-			file under /sys/module/workqueue/parameters.
-			However, the changed default will only apply to
-			unbound workqueues created afterwards.
+			This can be changed after boot by writing to the
+			matching /sys/module/workqueue/parameters file. All
+			workqueues with the "default" affinity scope will be
+			updated accordignly.
 
 	workqueue.debug_force_rr_cpu
 			Workqueue used to implicitly guarantee that work