From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao 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 Signed-off-by: Tejun Heo --- Documentation/admin-guide/video-output.rst | 34 ++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 Documentation/admin-guide/video-output.rst (limited to 'Documentation/admin-guide/video-output.rst') diff --git a/Documentation/admin-guide/video-output.rst b/Documentation/admin-guide/video-output.rst new file mode 100644 index 000000000..56d6fa2e2 --- /dev/null +++ b/Documentation/admin-guide/video-output.rst @@ -0,0 +1,34 @@ +Video Output Switcher Control +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +2006 luming.yu@intel.com + +The output sysfs class driver provides an abstract video output layer that +can be used to hook platform specific methods to enable/disable video output +device through common sysfs interface. For example, on my IBM ThinkPad T42 +laptop, The ACPI video driver registered its output devices and read/write +method for 'state' with output sysfs class. The user interface under sysfs is:: + + linux:/sys/class/video_output # tree . + . + |-- CRT0 + | |-- device -> ../../../devices/pci0000:00/0000:00:01.0 + | |-- state + | |-- subsystem -> ../../../class/video_output + | `-- uevent + |-- DVI0 + | |-- device -> ../../../devices/pci0000:00/0000:00:01.0 + | |-- state + | |-- subsystem -> ../../../class/video_output + | `-- uevent + |-- LCD0 + | |-- device -> ../../../devices/pci0000:00/0000:00:01.0 + | |-- state + | |-- subsystem -> ../../../class/video_output + | `-- uevent + `-- TV0 + |-- device -> ../../../devices/pci0000:00/0000:00:01.0 + |-- state + |-- subsystem -> ../../../class/video_output + `-- uevent + -- cgit v1.3.1