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, 75 insertions, 0 deletions

diff --git a/drivers/pinctrl/stm32/Kconfig b/drivers/pinctrl/stm32/Kconfig
new file mode 100644
index 000000000..d6a171523
--- /dev/null
+++ b/drivers/pinctrl/stm32/Kconfig
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if ARCH_STM32 || COMPILE_TEST
+
+config PINCTRL_STM32
+	tristate
+	depends on OF
+	select PINMUX
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select IRQ_DOMAIN_HIERARCHY
+	select MFD_SYSCON
+
+config PINCTRL_STM32F429
+	bool "STMicroelectronics STM32F429 pin control" if COMPILE_TEST && !MACH_STM32F429
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F429
+	select PINCTRL_STM32
+
+config PINCTRL_STM32F469
+	bool "STMicroelectronics STM32F469 pin control" if COMPILE_TEST && !MACH_STM32F469
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F469
+	select PINCTRL_STM32
+
+config PINCTRL_STM32F746
+	bool "STMicroelectronics STM32F746 pin control" if COMPILE_TEST && !MACH_STM32F746
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F746
+	select PINCTRL_STM32
+
+config PINCTRL_STM32F769
+	bool "STMicroelectronics STM32F769 pin control" if COMPILE_TEST && !MACH_STM32F769
+	depends on OF && HAS_IOMEM
+	default MACH_STM32F769
+	select PINCTRL_STM32
+
+config PINCTRL_STM32H743
+	bool "STMicroelectronics STM32H743 pin control" if COMPILE_TEST && !MACH_STM32H743
+	depends on OF && HAS_IOMEM
+	default MACH_STM32H743
+	select PINCTRL_STM32
+
+config PINCTRL_STM32MP135
+	bool "STMicroelectronics STM32MP135 pin control" if COMPILE_TEST && !MACH_STM32MP13
+	depends on OF && HAS_IOMEM
+	default MACH_STM32MP13
+	select PINCTRL_STM32
+
+config PINCTRL_STM32MP157
+	bool "STMicroelectronics STM32MP157 pin control" if COMPILE_TEST && !MACH_STM32MP157
+	depends on OF && HAS_IOMEM
+	default MACH_STM32MP157
+	select PINCTRL_STM32
+
+config PINCTRL_STM32MP257
+	tristate "STMicroelectronics STM32MP257 pin control"
+	depends on OF && HAS_IOMEM
+	default MACH_STM32MP25 || (ARCH_STM32 && ARM64)
+	select PINCTRL_STM32
+
+config PINCTRL_STM32_HDP
+	tristate "STMicroelectronics STM32 Hardware Debug Port (HDP) pin control"
+	depends on OF && HAS_IOMEM
+	default ARCH_STM32 && !ARM_SINGLE_ARMV7M
+	select PINMUX
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select GPIO_GENERIC
+	help
+	  The Hardware Debug Port allows the observation of internal signals.
+	  It uses configurable multiplexer to route signals in a dedicated observation register.
+	  This driver also permits the observation of signals on external SoC pins.
+	  It permits the observation of up to 16 signals per HDP line.
+
+endif