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, 33 insertions, 0 deletions

diff --git a/drivers/soc/rockchip/Kconfig b/drivers/soc/rockchip/Kconfig
new file mode 100644
index 000000000..785f60c6f
--- /dev/null
+++ b/drivers/soc/rockchip/Kconfig
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if ARCH_ROCKCHIP || COMPILE_TEST
+
+#
+# Rockchip Soc drivers
+#
+
+config ROCKCHIP_GRF
+	bool "Rockchip General Register Files support" if COMPILE_TEST
+	default y if ARCH_ROCKCHIP
+	help
+	  The General Register Files are a central component providing
+	  special additional settings registers for a lot of soc-components.
+	  In a lot of cases there also need to be default settings initialized
+	  to make some of them conform to expectations of the kernel.
+
+config ROCKCHIP_IODOMAIN
+	tristate "Rockchip IO domain support"
+	depends on OF
+	help
+	  Say y here to enable support io domains on Rockchip SoCs. It is
+	  necessary for the io domain setting of the SoC to match the
+	  voltage supplied by the regulators.
+
+config ROCKCHIP_DTPM
+	tristate "Rockchip DTPM hierarchy"
+	depends on DTPM && m
+	help
+	  Describe the hierarchy for the Dynamic Thermal Power Management tree
+	  on this platform. That will create all the power capping capable
+	  devices.
+
+endif