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, 32 insertions, 0 deletions

diff --git a/drivers/clk/sprd/Kconfig b/drivers/clk/sprd/Kconfig
new file mode 100644
index 000000000..2f19c8d58
--- /dev/null
+++ b/drivers/clk/sprd/Kconfig
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SPRD_COMMON_CLK
+	tristate "Clock support for Spreadtrum SoCs"
+	depends on ARCH_SPRD || COMPILE_TEST
+	default ARCH_SPRD
+	select REGMAP_MMIO
+
+if SPRD_COMMON_CLK
+
+# SoC Drivers
+
+config SPRD_SC9860_CLK
+	tristate "Support for the Spreadtrum SC9860 clocks"
+	depends on (ARM64 && ARCH_SPRD) || COMPILE_TEST
+	default ARM64 && ARCH_SPRD
+
+config SPRD_SC9863A_CLK
+	tristate "Support for the Spreadtrum SC9863A clocks"
+	depends on (ARM64 && ARCH_SPRD) || COMPILE_TEST
+	default ARM64 && ARCH_SPRD
+	help
+	  Support for the global clock controller on sc9863a devices.
+	  Say Y if you want to use peripheral devices on sc9863a SoC.
+
+config SPRD_UMS512_CLK
+	tristate "Support for the Spreadtrum UMS512 clocks"
+	depends on (ARM64 && ARCH_SPRD) || COMPILE_TEST
+	default ARM64 && ARCH_SPRD
+	help
+	  Support for the global clock controller on ums512 devices.
+	  Say Y if you want to use peripheral devices on ums512 SoC.
+endif