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, 138 insertions, 0 deletions

diff --git a/drivers/phy/marvell/Kconfig b/drivers/phy/marvell/Kconfig
new file mode 100644
index 000000000..bccd72dcc
--- /dev/null
+++ b/drivers/phy/marvell/Kconfig
@@ -0,0 +1,138 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Phy drivers for Marvell platforms
+#
+config ARMADA375_USBCLUSTER_PHY
+	bool "Armada 375 USB cluster PHY support" if COMPILE_TEST
+	default y if MACH_ARMADA_375
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+
+config PHY_BERLIN_SATA
+	tristate "Marvell Berlin SATA PHY driver"
+	depends on ARCH_BERLIN || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to support the SATA PHY on Marvell Berlin SoCs.
+
+config PHY_BERLIN_USB
+	tristate "Marvell Berlin USB PHY Driver"
+	depends on ARCH_BERLIN || COMPILE_TEST
+	depends on OF && HAS_IOMEM && RESET_CONTROLLER
+	select GENERIC_PHY
+	help
+	  Enable this to support the USB PHY on Marvell Berlin SoCs.
+
+config PHY_MVEBU_A3700_COMPHY
+	tristate "Marvell A3700 comphy driver"
+	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on OF
+	depends on HAVE_ARM_SMCCC
+	default ARCH_MVEBU
+	select GENERIC_PHY
+	help
+	  This driver allows to control the comphy, a hardware block providing
+	  shared serdes PHYs on Marvell Armada 3700. Its serdes lanes can be
+	  used by various controllers: Ethernet, SATA, USB3, PCIe.
+
+config PHY_MVEBU_A3700_UTMI
+	tristate "Marvell A3700 UTMI driver"
+	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on OF
+	default ARCH_MVEBU
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell A3700 UTMI PHY driver.
+
+config PHY_MVEBU_A38X_COMPHY
+	tristate "Marvell Armada 38x comphy driver"
+	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on OF
+	select GENERIC_PHY
+	help
+	  This driver allows to control the comphy, an hardware block providing
+	  shared serdes PHYs on Marvell Armada 38x. Its serdes lanes can be
+	  used by various controllers (Ethernet, sata, usb, PCIe...).
+
+config PHY_MVEBU_CP110_COMPHY
+	tristate "Marvell CP110 comphy driver"
+	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on OF
+	depends on HAVE_ARM_SMCCC
+	select GENERIC_PHY
+	help
+	  This driver allows to control the comphy, an hardware block providing
+	  shared serdes PHYs on Marvell Armada 7k/8k (in the CP110). Its serdes
+	  lanes can be used by various controllers (Ethernet, sata, usb,
+	  PCIe...).
+
+config PHY_MVEBU_CP110_UTMI
+	tristate "Marvell CP110 UTMI driver"
+	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on OF && USB_COMMON
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell CP110 UTMI PHY driver.
+
+config PHY_MVEBU_SATA
+	def_bool y
+	depends on ARCH_DOVE || MACH_DOVE || MACH_KIRKWOOD
+	depends on OF
+	select GENERIC_PHY
+
+config PHY_PXA_28NM_HSIC
+	tristate "Marvell USB HSIC 28nm PHY Driver"
+	depends on HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell USB HSIC PHY driver for Marvell
+	  SoC. This driver will do the PHY initialization and shutdown.
+	  The PHY driver will be used by Marvell ehci driver.
+
+	  To compile this driver as a module, choose M here.
+
+config PHY_PXA_28NM_USB2
+	tristate "Marvell USB 2.0 28nm PHY Driver"
+	depends on HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell USB 2.0 PHY driver for Marvell
+	  SoC. This driver will do the PHY initialization and shutdown.
+	  The PHY driver will be used by Marvell udc/ehci/otg driver.
+
+	  To compile this driver as a module, choose M here.
+
+config PHY_PXA_USB
+	tristate "Marvell PXA USB PHY Driver"
+	depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell PXA USB PHY driver for Marvell
+	  SoC. This driver will do the PHY initialization and shutdown.
+	  The PHY driver will be used by Marvell udc/ehci/otg driver.
+
+	  To compile this driver as a module, choose M here.
+
+config PHY_MMP3_USB
+	tristate "Marvell MMP3 USB PHY Driver"
+	depends on MACH_MMP3_DT || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell MMP3 USB PHY driver for Marvell
+	  SoC. This driver will do the PHY initialization and shutdown.
+	  The PHY driver will be used by Marvell udc/ehci/otg driver.
+
+	  To compile this driver as a module, choose M here.
+
+config PHY_MMP3_HSIC
+	tristate "Marvell MMP3 USB HSIC PHY Driver"
+	depends on MACH_MMP3_DT || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this to support Marvell MMP3 USB HSIC PHY driver for
+	  Marvell MMP3 SoC. This driver will be used my the Marvell EHCI
+	  driver to initialize the interface to internal USB HSIC
+	  components on MMP3-based boards.
+
+	  To compile this driver as a module, choose M here.