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, 144 insertions, 0 deletions

diff --git a/drivers/pinctrl/sunxi/Kconfig b/drivers/pinctrl/sunxi/Kconfig
new file mode 100644
index 000000000..dc62eba96
--- /dev/null
+++ b/drivers/pinctrl/sunxi/Kconfig
@@ -0,0 +1,144 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if ARCH_SUNXI
+
+config PINCTRL_SUNXI
+	bool
+	select PINMUX
+	select GENERIC_PINCONF
+	select GPIOLIB
+
+config PINCTRL_SUNIV_F1C100S
+	def_bool MACH_SUNIV
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN4I_A10
+	bool "Support for the Allwinner A10, A20 and R40 PIO"
+	default MACH_SUN4I || MACH_SUN7I || MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN5I
+	bool "Support for the Allwinner A10s, A13, R8 and NextThing GR8 PIO"
+	default MACH_SUN5I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN6I_A31
+	bool "Support for the Allwinner A31 PIO"
+	default MACH_SUN6I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN6I_A31_R
+	bool "Support for the Allwinner A31 R-PIO"
+	default MACH_SUN6I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_A23
+	bool "Support for the Allwinner A23 PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_A33
+	bool "Support for the Allwinner A33 PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_A83T
+	bool "Support for the Allwinner A83T PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_A83T_R
+	bool "Support for the Allwinner A83T R-PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_A23_R
+	bool "Support for the Allwinner A23 and A33 R-PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_H3
+	bool "Support for the Allwinner H3 PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_H3_R
+	bool "Support for the Allwinner H3 and H5 R-PIO"
+	default MACH_SUN8I || (ARM64 && ARCH_SUNXI)
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN8I_V3S
+	bool "Support for the Allwinner V3s PIO"
+	default MACH_SUN8I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN9I_A80
+	bool "Support for the Allwinner A80 PIO"
+	default MACH_SUN9I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN9I_A80_R
+	bool "Support for the Allwinner A80 R-PIO"
+	default MACH_SUN9I
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN20I_D1
+	bool "Support for the Allwinner D1 PIO"
+	default MACH_SUN8I || (RISCV && ARCH_SUNXI)
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_A64
+	bool "Support for the Allwinner A64 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_A64_R
+	bool "Support for the Allwinner A64 R-PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_A100
+	bool "Support for the Allwinner A100 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_A100_R
+	bool "Support for the Allwinner A100 R-PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_H5
+	bool "Support for the Allwinner H5 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_H6
+	bool "Support for the Allwinner H6 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_H6_R
+	bool "Support for the Allwinner H6 R-PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_H616
+	bool "Support for the Allwinner H616 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN50I_H616_R
+	bool "Support for the Allwinner H616 R-PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN55I_A523
+	bool "Support for the Allwinner A523 PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+config PINCTRL_SUN55I_A523_R
+	bool "Support for the Allwinner A523 R-PIO"
+	default ARM64 && ARCH_SUNXI
+	select PINCTRL_SUNXI
+
+endif