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, 57 insertions, 0 deletions

diff --git a/drivers/pinctrl/spear/Kconfig b/drivers/pinctrl/spear/Kconfig
new file mode 100644
index 000000000..98f5a84cc
--- /dev/null
+++ b/drivers/pinctrl/spear/Kconfig
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# ST Microelectronics SPEAr PINCTRL drivers
+#
+
+if PLAT_SPEAR
+
+config PINCTRL_SPEAR
+	bool
+	depends on OF
+	select PINMUX
+	help
+	  This enables pin control drivers for SPEAr Platform
+
+config PINCTRL_SPEAR3XX
+	bool
+	depends on ARCH_SPEAR3XX
+	select PINCTRL_SPEAR
+
+config PINCTRL_SPEAR300
+	bool "ST Microelectronics SPEAr300 SoC pin controller driver"
+	depends on MACH_SPEAR300
+	select PINCTRL_SPEAR3XX
+
+config PINCTRL_SPEAR310
+	bool "ST Microelectronics SPEAr310 SoC pin controller driver"
+	depends on MACH_SPEAR310
+	select PINCTRL_SPEAR3XX
+	select PINCTRL_SPEAR_PLGPIO
+
+config PINCTRL_SPEAR320
+	bool "ST Microelectronics SPEAr320 SoC pin controller driver"
+	depends on MACH_SPEAR320
+	select PINCTRL_SPEAR3XX
+	select PINCTRL_SPEAR_PLGPIO
+
+config PINCTRL_SPEAR1310
+	bool "ST Microelectronics SPEAr1310 SoC pin controller driver"
+	depends on MACH_SPEAR1310
+	select PINCTRL_SPEAR
+	select PINCTRL_SPEAR_PLGPIO
+
+config PINCTRL_SPEAR1340
+	bool "ST Microelectronics SPEAr1340 SoC pin controller driver"
+	depends on MACH_SPEAR1340
+	select PINCTRL_SPEAR
+	select PINCTRL_SPEAR_PLGPIO
+
+config PINCTRL_SPEAR_PLGPIO
+	bool "SPEAr SoC PLGPIO Controller"
+	depends on GPIOLIB && PINCTRL_SPEAR
+	select GPIOLIB_IRQCHIP
+	help
+	  Say yes here to support PLGPIO controller on ST Microelectronics SPEAr
+	  SoCs.
+
+endif