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, 92 insertions, 0 deletions

diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
new file mode 100644
index 000000000..1af4fc320
--- /dev/null
+++ b/drivers/pinctrl/meson/Kconfig
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig PINCTRL_MESON
+	tristate "Amlogic SoC pinctrl drivers"
+	depends on ARCH_MESON || COMPILE_TEST
+	depends on OF
+	default ARCH_MESON
+	select PINMUX
+	select PINCONF
+	select GENERIC_PINCONF
+	select GPIOLIB
+	select REGMAP_MMIO
+
+if PINCTRL_MESON
+
+config PINCTRL_MESON8
+	bool "Meson 8 SoC pinctrl driver"
+	depends on ARM || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON8B
+	bool "Meson 8b SoC pinctrl driver"
+	depends on ARM || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_GXBB
+	tristate "Meson gxbb SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_GXL
+	tristate "Meson gxl SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON8_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON8_PMX
+	tristate
+
+config PINCTRL_MESON_AXG
+	tristate "Meson axg Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_AXG_PMX
+	tristate
+
+config PINCTRL_MESON_G12A
+	tristate "Meson g12a Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_A1
+	tristate "Meson a1 Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_MESON_S4
+	tristate "Meson s4 Soc pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_AMLOGIC_A4
+	bool "AMLOGIC pincontrol"
+	depends on ARM64 || COMPILE_TEST
+	default ARCH_MESON
+	help
+	  This is the driver for the pin controller found on Amlogic SoCs.
+
+	  This driver is simplify subsequent support for new amlogic SoCs,
+	  to support new Amlogic SoCs, only need to add the corresponding dts file,
+	  no additional binding header files or C file are added.
+
+config PINCTRL_AMLOGIC_C3
+	tristate "Amlogic C3 SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+config PINCTRL_AMLOGIC_T7
+	tristate "Amlogic T7 SoC pinctrl driver"
+	depends on ARM64 || COMPILE_TEST
+	select PINCTRL_MESON_AXG_PMX
+	default ARCH_MESON
+
+endif