ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 146 insertions, 0 deletions

diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
new file mode 100644
index 000000000..54f11f000
--- /dev/null
+++ b/drivers/iio/humidity/Kconfig
@@ -0,0 +1,146 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# humidity sensor drivers
+#
+menu "Humidity sensors"
+
+config AM2315
+	tristate "Aosong AM2315 relative humidity and temperature sensor"
+	depends on I2C
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  If you say yes here you get support for the Aosong AM2315
+	  relative humidity and ambient temperature sensor.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called am2315.
+
+config DHT11
+	tristate "DHT11 (and compatible sensors) driver"
+	depends on GPIOLIB || COMPILE_TEST
+	help
+	  This driver supports reading data via a single interrupt
+	  generating GPIO line. Currently tested are DHT11 and DHT22.
+	  Other sensors should work as well as long as they speak the
+	  same protocol.
+
+config ENS210
+	tristate "ENS210 temperature and humidity sensor"
+	depends on I2C
+	select CRC7
+	help
+	  Say yes here to get support for the ScioSense ENS210 family of
+	  humidity and temperature sensors.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ens210.
+
+config HDC100X
+	tristate "TI HDC100x relative humidity and temperature sensor"
+	depends on I2C
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  Say yes here to build support for the Texas Instruments
+	  HDC1000, HDC1008, HDC1010, HDC1050, and HDC1080 relative
+	  humidity and temperature sensors.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hdc100x.
+
+config HDC2010
+	tristate "TI HDC2010 relative humidity and temperature sensor"
+	depends on I2C
+	help
+	  Say yes here to build support for the Texas Instruments
+	  HDC2010 and HDC2080 relative humidity and temperature sensors.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hdc2010.
+
+config HDC3020
+	tristate "TI HDC3020 relative humidity and temperature sensor"
+	depends on I2C
+	select CRC8
+	help
+	  Say yes here to build support for the Texas Instruments
+	  HDC3020, HDC3021 and HDC3022 relative humidity and temperature
+	  sensors.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hdc3020.
+
+config HID_SENSOR_HUMIDITY
+	tristate "HID Environmental humidity sensor"
+	depends on HID_SENSOR_HUB
+	select IIO_BUFFER
+	select HID_SENSOR_IIO_COMMON
+	select HID_SENSOR_IIO_TRIGGER
+	help
+	  Say yes here to build support for the HID SENSOR
+	  humidity driver
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hid-sensor-humidity.
+
+config HTS221
+	tristate "STMicroelectronics HTS221 sensor Driver"
+	depends on (I2C || SPI)
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	select HTS221_I2C if (I2C)
+	select HTS221_SPI if (SPI_MASTER)
+	help
+	  Say yes here to build support for STMicroelectronics HTS221
+	  temperature-humidity sensor
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hts221.
+
+config HTS221_I2C
+	tristate
+	depends on HTS221
+	select REGMAP_I2C
+
+config HTS221_SPI
+	tristate
+	depends on HTS221
+	select REGMAP_SPI
+
+config HTU21
+	tristate "Measurement Specialties HTU21 humidity & temperature sensor"
+	depends on I2C
+	select IIO_MS_SENSORS_I2C
+	help
+	  If you say yes here you get support for the Measurement Specialties
+	  HTU21 humidity and temperature sensor.
+	  This driver is also used for MS8607 temperature, pressure & humidity
+	  sensor
+
+	  This driver can also be built as a module. If so, the module will
+	  be called htu21.
+
+config SI7005
+	tristate "SI7005 relative humidity and temperature sensor"
+	depends on I2C
+	help
+	  Say yes here to build support for the Silabs Si7005 relative
+	  humidity and temperature sensor.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called si7005. This driver also
+	  supports Hoperf TH02 Humidity and Temperature Sensor.
+
+config SI7020
+	tristate "Si7013/20/21 Relative Humidity and Temperature Sensors"
+	depends on I2C
+	help
+	  Say yes here to build support for the Silicon Labs Si7013/20/21
+	  Relative Humidity and Temperature Sensors. This driver also
+	  supports Hoperf TH06 Humidity and Temperature Sensor.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called si7020.
+
+endmenu