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, 51 insertions, 0 deletions

diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig
new file mode 100644
index 000000000..90a9ca2db
--- /dev/null
+++ b/drivers/phy/renesas/Kconfig
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Phy drivers for Renesas platforms
+#
+# NOTE: Please sorted config names alphabetically.
+config PHY_R8A779F0_ETHERNET_SERDES
+	tristate "Renesas R-Car S4-8 Ethernet SERDES driver"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Support for Ethernet SERDES found on Renesas R-Car S4-8 SoCs.
+
+config PHY_RCAR_GEN2
+	tristate "Renesas R-Car generation 2 USB PHY driver"
+	depends on ARCH_RENESAS
+	select GENERIC_PHY
+	help
+	  Support for USB PHY found on Renesas R-Car generation 2 SoCs.
+
+config PHY_RCAR_GEN3_PCIE
+	tristate "Renesas R-Car generation 3 PCIe PHY driver"
+	depends on ARCH_RENESAS
+	select GENERIC_PHY
+	help
+	  Support for the PCIe PHY found on Renesas R-Car generation 3 SoCs.
+
+config PHY_RCAR_GEN3_USB2
+	tristate "Renesas R-Car generation 3 USB 2.0 PHY driver"
+	depends on ARCH_RENESAS
+	depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in
+	depends on USB_SUPPORT
+	depends on REGULATOR
+	select GENERIC_PHY
+	select MULTIPLEXER
+	select USB_COMMON
+	help
+	  Support for USB 2.0 PHY found on Renesas R-Car generation 3 SoCs.
+
+config PHY_RCAR_GEN3_USB3
+	tristate "Renesas R-Car generation 3 USB 3.0 PHY driver"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Support for USB 3.0 PHY found on Renesas R-Car generation 3 SoCs.
+
+config PHY_RZ_G3E_USB3
+	tristate "Renesas RZ/G3E USB 3.0 PHY driver"
+	depends on ARCH_RENESAS || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Support for USB 3.0 PHY found on Renesas RZ/G3E SoCs.