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, 230 insertions, 0 deletions

diff --git a/drivers/pinctrl/bcm/Kconfig b/drivers/pinctrl/bcm/Kconfig
new file mode 100644
index 000000000..19d22e7fd
--- /dev/null
+++ b/drivers/pinctrl/bcm/Kconfig
@@ -0,0 +1,230 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Broadcom pinctrl drivers
+#
+
+config PINCTRL_BCM281XX
+	bool "Broadcom BCM281xx pinctrl driver"
+	depends on OF && (ARCH_BCM_MOBILE || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select REGMAP_MMIO
+	default ARCH_BCM_MOBILE
+	help
+	  Say Y here to support Broadcom BCM281xx pinctrl driver, which is used
+	  for the BCM281xx SoC family, including BCM11130, BCM11140, BCM11351,
+	  BCM28145, and BCM28155 SoCs.  This driver requires the pinctrl
+	  framework.  GPIO is provided by a separate GPIO driver.
+
+config PINCTRL_BCM2835
+	tristate "Broadcom BCM2835 GPIO (with PINCONF) driver"
+	depends on OF && (ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	default ARCH_BCM2835 || ARCH_BRCMSTB
+	help
+	   Say Y here to enable the Broadcom BCM2835 GPIO driver.
+
+config PINCTRL_BCM4908
+	tristate "Broadcom BCM4908 pinmux driver"
+	depends on OF && (ARCH_BCMBCA || COMPILE_TEST)
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	default ARCH_BCMBCA
+	help
+	  Driver for BCM4908 family SoCs with integrated pin controller.
+
+	  If compiled as module it will be called pinctrl-bcm4908.
+
+config PINCTRL_BCM63XX
+	bool
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select REGMAP
+	select GPIO_REGMAP
+
+config PINCTRL_BCM6318
+	bool "Broadcom BCM6318 GPIO driver"
+	depends on (BMIPS_GENERIC || COMPILE_TEST)
+	depends on OF
+	select PINCTRL_BCM63XX
+	default BMIPS_GENERIC
+	help
+	   Say Y here to enable the Broadcom BCM6318 GPIO driver.
+
+config PINCTRL_BCM6328
+	bool "Broadcom BCM6328 GPIO driver"
+	depends on (BMIPS_GENERIC || COMPILE_TEST)
+	depends on OF
+	select PINCTRL_BCM63XX
+	default BMIPS_GENERIC
+	help
+	   Say Y here to enable the Broadcom BCM6328 GPIO driver.
+
+config PINCTRL_BCM6358
+	bool "Broadcom BCM6358 GPIO driver"
+	depends on (BMIPS_GENERIC || COMPILE_TEST)
+	depends on OF
+	select PINCTRL_BCM63XX
+	default BMIPS_GENERIC
+	help
+	   Say Y here to enable the Broadcom BCM6358 GPIO driver.
+
+config PINCTRL_BCM6362
+	bool "Broadcom BCM6362 GPIO driver"
+	depends on (BMIPS_GENERIC || COMPILE_TEST)
+	depends on OF
+	select PINCTRL_BCM63XX
+	default BMIPS_GENERIC
+	help
+	   Say Y here to enable the Broadcom BCM6362 GPIO driver.
+
+config PINCTRL_BCM6368
+	bool "Broadcom BCM6368 GPIO driver"
+	depends on (BMIPS_GENERIC || COMPILE_TEST)
+	depends on OF
+	select PINCTRL_BCM63XX
+	default BMIPS_GENERIC
+	help
+	   Say Y here to enable the Broadcom BCM6368 GPIO driver.
+
+config PINCTRL_BCM63268
+	bool "Broadcom BCM63268 GPIO driver"
+	depends on (BMIPS_GENERIC || COMPILE_TEST)
+	depends on OF
+	select PINCTRL_BCM63XX
+	default BMIPS_GENERIC
+	help
+	   Say Y here to enable the Broadcom BCM63268 GPIO driver.
+
+config PINCTRL_BRCMSTB
+        tristate "Broadcom STB product line pin controller driver"
+        depends on OF && (ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST)
+        select PINMUX
+        select PINCONF
+        select GENERIC_PINCONF
+        help
+          Enable pin muxing and configuration functionality
+          for Broadcom STB product line chipsets.
+
+source "drivers/pinctrl/bcm/Kconfig.stb"
+
+config PINCTRL_IPROC_GPIO
+	bool "Broadcom iProc GPIO (with PINCONF) driver"
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_IPROC
+	help
+	  Say yes here to enable the Broadcom iProc GPIO driver.
+
+	  The Broadcom iProc based SoCs- Cygnus, NS2, NSP and Stingray, use
+	  same GPIO Controller IP hence this driver could be used for all.
+
+	  The Broadcom Cygnus SoC has 3 GPIO controllers including the ASIU
+	  GPIO controller (ASIU), the chipCommonG GPIO controller (CCM), and
+	  the always-ON GPIO controller (CRMU/AON). All 3 GPIO controllers are
+	  supported by this driver.
+
+	  The Broadcom NSP has two GPIO controllers including the ChipcommonA
+	  GPIO, the ChipcommonB GPIO. Later controller is supported by this
+	  driver.
+
+	  The Broadcom NS2 has two GPIO controller including the CRMU GPIO,
+	  the ChipcommonG GPIO. Both controllers are supported by this driver.
+
+	  The Broadcom Stingray GPIO controllers are supported by this driver.
+
+	  All above SoCs GPIO controllers support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+	  It provides the framework where pins from the individual GPIO can be
+	  individually muxed to GPIO function, through interaction with the
+	  SoCs IOMUX controller. This features could be used only on SoCs which
+	  support individual pin muxing.
+
+config PINCTRL_CYGNUS_MUX
+	bool "Broadcom Cygnus IOMUX driver"
+	depends on (ARCH_BCM_CYGNUS || COMPILE_TEST)
+	depends on OF
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_CYGNUS
+	help
+	  Say yes here to enable the Broadcom Cygnus IOMUX driver.
+
+	  The Broadcom Cygnus IOMUX driver supports group based IOMUX
+	  configuration, with the exception that certain individual pins
+	  can be overridden to GPIO function
+
+config PINCTRL_NS
+	bool "Broadcom Northstar pins driver"
+	depends on OF && (ARCH_BCM_5301X || COMPILE_TEST)
+	select PINMUX
+	select GENERIC_PINCONF
+	select GENERIC_PINCTRL_GROUPS
+	select GENERIC_PINMUX_FUNCTIONS
+	default ARCH_BCM_5301X
+	help
+	  Say yes here to enable the Broadcom NS SoC pins driver.
+
+	  The Broadcom Northstar pins driver supports muxing multi-purpose pins
+	  that can be used for various functions (e.g. SPI, I2C, UART) as well
+	  as GPIOs.
+
+config PINCTRL_NSP_GPIO
+	bool "Broadcom NSP GPIO (with PINCONF) driver"
+	depends on ARCH_BCM_NSP || COMPILE_TEST
+	select GPIOLIB
+	select GPIOLIB_IRQCHIP
+	select PINCONF
+	select GENERIC_PINCONF
+	default ARCH_BCM_NSP
+	help
+	  Say yes here to enable the Broadcom NSP GPIO driver.
+
+	  The Broadcom Northstar Plus SoC ChipcommonA GPIO controller is
+	  supported by this driver.
+
+	  The ChipcommonA GPIO controller support basic PINCONF functions such
+	  as bias pull up, pull down, and drive strength configurations, when
+	  these pins are muxed to GPIO.
+
+config PINCTRL_NS2_MUX
+	bool "Broadcom Northstar2 pinmux driver"
+	depends on OF
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARM64 && ARCH_BCM_IPROC
+	help
+	  Say yes here to enable the Broadcom NS2 MUX driver.
+
+	  The Broadcom Northstar2 IOMUX driver supports group based IOMUX
+	  configuration.
+
+config PINCTRL_NSP_MUX
+	bool "Broadcom NSP IOMUX driver"
+	depends on (ARCH_BCM_NSP || COMPILE_TEST)
+	depends on OF
+	select PINMUX
+	select GENERIC_PINCONF
+	default ARCH_BCM_NSP
+	help
+	  Say yes here to enable the Broadcom NSP SOC IOMUX driver.
+
+	  The Broadcom Northstar Plus IOMUX driver supports pin based IOMUX
+	  configuration, with certain individual pins can be overridden
+	  to GPIO function.