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, 131 insertions, 0 deletions

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
new file mode 100644
index 000000000..b292e7ca5
--- /dev/null
+++ b/drivers/clk/imx/Kconfig
@@ -0,0 +1,131 @@
+# SPDX-License-Identifier: GPL-2.0
+# common clock support for NXP i.MX SoC family.
+config MXC_CLK
+	tristate "IMX clock"
+	depends on ARCH_MXC || COMPILE_TEST
+
+config MXC_CLK_SCU
+	tristate
+
+config CLK_IMX1
+	def_bool SOC_IMX1
+	select MXC_CLK
+
+config CLK_IMX25
+	def_bool SOC_IMX25
+	select MXC_CLK
+
+config CLK_IMX27
+	def_bool SOC_IMX27
+	select MXC_CLK
+
+config CLK_IMX31
+	def_bool SOC_IMX31
+	select MXC_CLK
+
+config CLK_IMX35
+	def_bool SOC_IMX35
+	select MXC_CLK
+
+config CLK_IMX5
+	def_bool SOC_IMX5
+	select MXC_CLK
+
+config CLK_IMX6Q
+	def_bool SOC_IMX6Q
+	select MXC_CLK
+
+config CLK_IMX6SL
+	def_bool SOC_IMX6SL
+	select MXC_CLK
+
+config CLK_IMX6SLL
+	def_bool SOC_IMX6SLL
+	select MXC_CLK
+
+config CLK_IMX6SX
+	def_bool SOC_IMX6SX
+	select MXC_CLK
+
+config CLK_IMX6UL
+	def_bool SOC_IMX6UL
+	select MXC_CLK
+
+config CLK_IMX7D
+	def_bool SOC_IMX7D
+	select MXC_CLK
+
+config CLK_IMX7ULP
+	def_bool SOC_IMX7ULP
+	select MXC_CLK
+
+config CLK_VF610
+	def_bool SOC_VF610
+	select MXC_CLK
+
+config CLK_IMX8MM
+	tristate "IMX8MM CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MM CCM Clock Driver
+
+config CLK_IMX8MN
+	tristate "IMX8MN CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MN CCM Clock Driver
+
+config CLK_IMX8MP
+	tristate "IMX8MP CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	select AUXILIARY_BUS if RESET_CONTROLLER
+	help
+	    Build the driver for i.MX8MP CCM Clock Driver
+
+config CLK_IMX8MQ
+	tristate "IMX8MQ CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX8MQ CCM Clock Driver
+
+config CLK_IMX8QXP
+	tristate "IMX8QXP SCU Clock"
+	depends on (ARCH_MXC && ARM64) || COMPILE_TEST
+	depends on IMX_SCU && HAVE_ARM_SMCCC
+	select MXC_CLK_SCU
+	select MXC_CLK
+	help
+	  Build the driver for IMX8QXP SCU based clocks.
+
+config CLK_IMX8ULP
+	tristate "IMX8ULP CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	select AUXILIARY_BUS
+	help
+	    Build the driver for i.MX8ULP CCM Clock Driver
+
+config CLK_IMX93
+	tristate "IMX93 CCM Clock Driver"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MX93 CCM Clock Driver
+
+config CLK_IMX95_BLK_CTL
+	tristate "IMX95 Clock Driver for BLK CTL"
+	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the clock driver for i.MX95 BLK CTL
+
+config CLK_IMXRT1050
+	tristate "IMXRT1050 CCM Clock Driver"
+	depends on SOC_IMXRT || COMPILE_TEST
+	select MXC_CLK
+	help
+	    Build the driver for i.MXRT1050 CCM Clock Driver