From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops 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 --- drivers/input/tablet/Kconfig | 90 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 drivers/input/tablet/Kconfig (limited to 'drivers/input/tablet/Kconfig') diff --git a/drivers/input/tablet/Kconfig b/drivers/input/tablet/Kconfig new file mode 100644 index 000000000..ec27eff6a --- /dev/null +++ b/drivers/input/tablet/Kconfig @@ -0,0 +1,90 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Tablet driver configuration +# +menuconfig INPUT_TABLET + bool "Tablets" + help + Say Y here, and a list of supported tablets will be displayed. + This option doesn't affect the kernel. + + If unsure, say Y. + +if INPUT_TABLET + +config TABLET_USB_ACECAD + tristate "Acecad Flair tablet support (USB)" + depends on USB_ARCH_HAS_HCD + select USB + help + Say Y here if you want to use the USB version of the Acecad Flair + tablet. Make sure to say Y to "Mouse support" + (CONFIG_INPUT_MOUSEDEV) and/or "Event interface support" + (CONFIG_INPUT_EVDEV) as well. + + To compile this driver as a module, choose M here: the + module will be called acecad. + +config TABLET_USB_AIPTEK + tristate "Aiptek 6000U/8000U and Genius G_PEN tablet support (USB)" + depends on USB_ARCH_HAS_HCD + select USB + help + Say Y here if you want to use the USB version of the Aiptek 6000U, + Aiptek 8000U or Genius G-PEN 560 tablet. Make sure to say Y to + "Mouse support" (CONFIG_INPUT_MOUSEDEV) and/or "Event interface + support" (CONFIG_INPUT_EVDEV) as well. + + To compile this driver as a module, choose M here: the + module will be called aiptek. + +config TABLET_USB_HANWANG + tristate "Hanwang Art Master III tablet support (USB)" + depends on USB_ARCH_HAS_HCD + select USB + help + Say Y here if you want to use the USB version of the Hanwang Art + Master III tablet. + + To compile this driver as a module, choose M here: the + module will be called hanwang. + +config TABLET_USB_KBTAB + tristate "KB Gear JamStudio tablet support (USB)" + depends on USB_ARCH_HAS_HCD + select USB + help + Say Y here if you want to use the USB version of the KB Gear + JamStudio tablet. Make sure to say Y to "Mouse support" + (CONFIG_INPUT_MOUSEDEV) and/or "Event interface support" + (CONFIG_INPUT_EVDEV) as well. + + To compile this driver as a module, choose M here: the + module will be called kbtab. + +config TABLET_USB_PEGASUS + tristate "Pegasus Mobile Notetaker Pen input tablet support" + depends on USB_ARCH_HAS_HCD + select USB + help + Say Y here if you want to use the Pegasus Mobile Notetaker, + also known as: + Genie e-note The Notetaker, + Staedtler Digital ballpoint pen 990 01, + IRISnotes Express or + NEWLink Digital Note Taker. + + To compile this driver as a module, choose M here: the + module will be called pegasus_notetaker. + +config TABLET_SERIAL_WACOM4 + tristate "Wacom protocol 4 serial tablet support" + select SERIO + help + Say Y here if you want to use Wacom protocol 4 serial tablets. + E.g. serial versions of the Cintiq, Graphire or Penpartner. + + To compile this driver as a module, choose M here: the + module will be called wacom_serial4. + +endif -- cgit v1.3.1