From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001
From: Breno Leitao <leitao@debian.org>
Date: Wed, 5 Aug 2026 07:52:36 -0700
Subject: workqueue: skip the node_nr_active update for non-unbound workqueues

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>
---
 Documentation/subsystem-apis.rst | 92 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/subsystem-apis.rst

(limited to 'Documentation/subsystem-apis.rst')

diff --git a/Documentation/subsystem-apis.rst b/Documentation/subsystem-apis.rst
new file mode 100644
index 000000000..b1ad48bb4
--- /dev/null
+++ b/Documentation/subsystem-apis.rst
@@ -0,0 +1,92 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+Kernel subsystem documentation
+==============================
+
+These books get into the details of how specific kernel subsystems work
+from the point of view of a kernel developer.  Much of the information here
+is taken directly from the kernel source, with supplemental material added
+as needed (or at least as we managed to add it — probably *not* all that is
+needed).
+
+Core subsystems
+---------------
+
+.. toctree::
+   :maxdepth: 1
+
+   core-api/index
+   driver-api/index
+   mm/index
+   power/index
+   scheduler/index
+   timers/index
+   locking/index
+
+Human interfaces
+----------------
+
+.. toctree::
+   :maxdepth: 1
+
+   input/index
+   hid/index
+   sound/index
+   gpu/index
+   fb/index
+   leds/index
+
+Networking interfaces
+---------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   networking/index
+   netlabel/index
+   infiniband/index
+   mhi/index
+
+Storage interfaces
+------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   filesystems/index
+   block/index
+   cdrom/index
+   scsi/index
+   target/index
+   nvme/index
+
+Other subsystems
+----------------
+**Fixme**: much more organizational work is needed here.
+
+.. toctree::
+   :maxdepth: 1
+
+   accounting/index
+   cpu-freq/index
+   edac/index
+   fpga/index
+   i2c/index
+   iio/index
+   pcmcia/index
+   spi/index
+   w1/index
+   watchdog/index
+   virt/index
+   hwmon/index
+   accel/index
+   security/index
+   crypto/index
+   bpf/index
+   usb/index
+   PCI/index
+   misc-devices/index
+   peci/index
+   wmi/index
+   tee/index
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