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>

7 files changed, 486 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml b/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml
new file mode 100644
index 000000000..51d68a778
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/arm,versatile-lcd.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/arm,versatile-lcd.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Versatile Character LCD
+
+maintainers:
+  - Linus Walleij <linusw@kernel.org>
+  - Rob Herring <robh@kernel.org>
+
+description:
+  This binding defines the character LCD interface found on ARM Versatile AB
+  and PB reference platforms.
+
+properties:
+  compatible:
+    const: arm,versatile-lcd
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    lcd@10008000 {
+        compatible = "arm,versatile-lcd";
+        reg = <0x10008000 0x1000>;
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml b/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
new file mode 100644
index 000000000..328954893
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/gpio-7-segment.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/gpio-7-segment.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO based LED segment display
+
+maintainers:
+  - Chris Packham <chris.packham@alliedtelesis.co.nz>
+
+properties:
+  compatible:
+    const: gpio-7-segment
+
+  segment-gpios:
+    description: |
+      An array of GPIOs one per segment. The first GPIO corresponds to the A
+      segment, the seventh GPIO corresponds to the G segment. Some LED blocks
+      also have a decimal point which can be specified as an optional eighth
+      segment.
+
+               -a-
+              |   |
+              f   b
+              |   |
+               -g-
+              |   |
+              e   c
+              |   |
+               -d-  dp
+
+    minItems: 7
+    maxItems: 8
+
+required:
+  - segment-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/gpio/gpio.h>
+
+    led-7seg {
+        compatible = "gpio-7-segment";
+        segment-gpios = <&gpio 0 GPIO_ACTIVE_LOW>,
+                        <&gpio 1 GPIO_ACTIVE_LOW>,
+                        <&gpio 2 GPIO_ACTIVE_LOW>,
+                        <&gpio 3 GPIO_ACTIVE_LOW>,
+                        <&gpio 4 GPIO_ACTIVE_LOW>,
+                        <&gpio 5 GPIO_ACTIVE_LOW>,
+                        <&gpio 6 GPIO_ACTIVE_LOW>;
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
new file mode 100644
index 000000000..3ca0e9863
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
@@ -0,0 +1,127 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/hit,hd44780.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hitachi HD44780 Character LCD Controller
+
+maintainers:
+  - Geert Uytterhoeven <geert@linux-m68k.org>
+
+description:
+  The Hitachi HD44780 Character LCD Controller is commonly used on character
+  LCDs that can display one or more lines of text. It exposes an M6800 bus
+  interface, which can be used in either 4-bit or 8-bit mode. By using a
+  GPIO expander it is possible to use the driver with one of the popular I2C
+  expander boards based on the PCF8574 available for these displays. For
+  an example see below.
+
+properties:
+  compatible:
+    const: hit,hd44780
+
+  data-gpios:
+    description:
+      GPIO pins connected to the data signal lines DB0-DB7 (8-bit mode) or
+      DB4-DB7 (4-bit mode) of the LCD Controller's bus interface.
+    oneOf:
+      - maxItems: 4
+      - maxItems: 8
+
+  enable-gpios:
+    description:
+      GPIO pin connected to the "E" (Enable) signal line of the LCD
+      Controller's bus interface.
+    maxItems: 1
+
+  rs-gpios:
+    description:
+      GPIO pin connected to the "RS" (Register Select) signal line of the LCD
+      Controller's bus interface.
+    maxItems: 1
+
+  rw-gpios:
+    description:
+      GPIO pin connected to the "RW" (Read/Write) signal line of the LCD
+      Controller's bus interface.
+    maxItems: 1
+
+  backlight-gpios:
+    description: GPIO pin used for enabling the LCD's backlight.
+    maxItems: 1
+
+  display-height-chars:
+    description: Height of the display, in character cells,
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 4
+
+  display-width-chars:
+    description: Width of the display, in character cells.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 64
+
+  internal-buffer-width:
+    description:
+      Internal buffer width (default is 40 for displays with 1 or 2 lines, and
+      display-width-chars for displays with more than 2 lines).
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 64
+
+required:
+  - compatible
+  - data-gpios
+  - enable-gpios
+  - rs-gpios
+  - display-height-chars
+  - display-width-chars
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    display-controller {
+        compatible = "hit,hd44780";
+
+        data-gpios = <&hc595 0 GPIO_ACTIVE_HIGH>,
+                     <&hc595 1 GPIO_ACTIVE_HIGH>,
+                     <&hc595 2 GPIO_ACTIVE_HIGH>,
+                     <&hc595 3 GPIO_ACTIVE_HIGH>;
+        enable-gpios = <&hc595 4 GPIO_ACTIVE_HIGH>;
+        rs-gpios = <&hc595 5 GPIO_ACTIVE_HIGH>;
+
+        display-height-chars = <2>;
+        display-width-chars = <16>;
+    };
+
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pcf8574: gpio-expander@27 {
+            compatible = "nxp,pcf8574";
+            reg = <0x27>;
+            gpio-controller;
+            #gpio-cells = <2>;
+        };
+    };
+
+    display-controller {
+        compatible = "hit,hd44780";
+        display-height-chars = <2>;
+        display-width-chars = <16>;
+        data-gpios = <&pcf8574 4 GPIO_ACTIVE_HIGH>,
+                     <&pcf8574 5 GPIO_ACTIVE_HIGH>,
+                     <&pcf8574 6 GPIO_ACTIVE_HIGH>,
+                     <&pcf8574 7 GPIO_ACTIVE_HIGH>;
+        enable-gpios = <&pcf8574 2 GPIO_ACTIVE_HIGH>;
+        rs-gpios = <&pcf8574 0 GPIO_ACTIVE_HIGH>;
+        rw-gpios = <&pcf8574 1 GPIO_ACTIVE_HIGH>;
+        backlight-gpios = <&pcf8574 3 GPIO_ACTIVE_HIGH>;
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml b/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
new file mode 100644
index 000000000..1d2e2429b
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
@@ -0,0 +1,103 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/holtek,ht16k33.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Holtek HT16K33 RAM mapping 16*8 LED controller with keyscan
+
+maintainers:
+  - Robin van der Gracht <robin@protonic.nl>
+
+allOf:
+  - $ref: /schemas/input/input.yaml#
+  - $ref: /schemas/input/matrix-keymap.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - adafruit,3108  # 0.56" 4-Digit 7-Segment FeatherWing Display (Red)
+              - adafruit,3130  # 0.54" Quad Alphanumeric FeatherWing Display (Red)
+          - const: holtek,ht16k33
+
+      - const: holtek,ht16k33     # Generic 16*8 LED controller with dot-matrix display
+
+  reg:
+    maxItems: 1
+
+  refresh-rate-hz:
+    maxItems: 1
+    description: Display update interval in Hertz for dot-matrix displays
+
+  interrupts:
+    maxItems: 1
+
+  debounce-delay-ms: true
+
+  linux,keymap: true
+
+  linux,no-autorepeat:
+    type: boolean
+    description: Disable keyrepeat
+
+  default-brightness-level:
+    minimum: 1
+    maximum: 16
+    default: 16
+    description: Initial brightness level
+
+  led:
+    type: object
+    $ref: /schemas/leds/common.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+
+if:
+  properties:
+    compatible:
+      const: holtek,ht16k33
+then:
+  required:
+    - refresh-rate-hz
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/input/input.h>
+    #include <dt-bindings/leds/common.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display-controller@70 {
+            compatible = "holtek,ht16k33";
+            reg = <0x70>;
+            refresh-rate-hz = <20>;
+            interrupt-parent = <&gpio4>;
+            interrupts = <5 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
+            debounce-delay-ms = <50>;
+            linux,keymap = <MATRIX_KEY(2, 0, KEY_F6)>,
+                           <MATRIX_KEY(3, 0, KEY_F8)>,
+                           <MATRIX_KEY(4, 0, KEY_F10)>,
+                           <MATRIX_KEY(5, 0, KEY_F4)>,
+                           <MATRIX_KEY(6, 0, KEY_F2)>,
+                           <MATRIX_KEY(2, 1, KEY_F5)>,
+                           <MATRIX_KEY(3, 1, KEY_F7)>,
+                           <MATRIX_KEY(4, 1, KEY_F9)>,
+                           <MATRIX_KEY(5, 1, KEY_F3)>,
+                           <MATRIX_KEY(6, 1, KEY_F1)>;
+
+            led {
+                color = <LED_COLOR_ID_RED>;
+                function = LED_FUNCTION_BACKLIGHT;
+                linux,default-trigger = "backlight";
+            };
+        };
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml b/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml
new file mode 100644
index 000000000..55e9831b3
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/img,ascii-lcd.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/img,ascii-lcd.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASCII LCD displays on Imagination Technologies boards
+
+maintainers:
+  - Paul Burton <paulburton@kernel.org>
+
+properties:
+  compatible:
+    enum:
+      - img,boston-lcd
+      - mti,malta-lcd
+      - mti,sead3-lcd
+
+  reg:
+    maxItems: 1
+
+  offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Offset in bytes to the LCD registers within the system controller
+
+required:
+  - compatible
+
+oneOf:
+  - required:
+      - reg
+  - required:
+      - offset
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: img,boston-lcd
+then:
+  required:
+    - reg
+else:
+  required:
+    - offset
+
+additionalProperties: false
+
+examples:
+  - |
+    lcd: lcd@17fff000 {
+        compatible = "img,boston-lcd";
+        reg = <0x17fff000 0x8>;
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/maxim,max6959.yaml b/Documentation/devicetree/bindings/auxdisplay/maxim,max6959.yaml
new file mode 100644
index 000000000..20dd9e8c8
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/maxim,max6959.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/maxim,max6959.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MAX6958/6959 7-segment LED display controller
+
+maintainers:
+  - Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+
+description:
+  The Maxim MAX6958/6959 7-segment LED display controller provides
+  an I2C interface to up to four 7-segment LED digits. The MAX6959,
+  in comparison to MAX6958, adds input support. Type of the chip can
+  be autodetected via specific register read, and hence the features
+  may be enabled in the driver at run-time, in case they are requested
+  via Device Tree. A given hardware is simple and does not provide
+  any additional pins, such as reset or power enable.
+
+properties:
+  compatible:
+    const: maxim,max6959
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display-controller@38 {
+            compatible = "maxim,max6959";
+            reg = <0x38>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/auxdisplay/modtronix,lcd2s.yaml b/Documentation/devicetree/bindings/auxdisplay/modtronix,lcd2s.yaml
new file mode 100644
index 000000000..a1d55a263
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/modtronix,lcd2s.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/modtronix,lcd2s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Modtronix engineering LCD2S Character LCD Display
+
+maintainers:
+  - Lars Poeschel <poeschel@lemonage.de>
+
+description:
+  The LCD2S is a Character LCD Display manufactured by Modtronix Engineering.
+  The display supports a serial I2C and SPI interface. The driver currently
+  only supports the I2C interface.
+
+properties:
+  compatible:
+    const: modtronix,lcd2s
+
+  reg:
+    maxItems: 1
+    description:
+      I2C bus address of the display.
+
+  display-height-chars:
+    description: Height of the display, in character cells.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 4
+
+  display-width-chars:
+    description: Width of the display, in character cells.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 16
+    maximum: 20
+
+required:
+  - compatible
+  - reg
+  - display-height-chars
+  - display-width-chars
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      lcd2s: auxdisplay@28 {
+        compatible = "modtronix,lcd2s";
+        reg = <0x28>;
+        display-height-chars = <4>;
+        display-width-chars = <20>;
+      };
+    };