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/misc/ocxl/Kconfig | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 drivers/misc/ocxl/Kconfig (limited to 'drivers/misc/ocxl/Kconfig') diff --git a/drivers/misc/ocxl/Kconfig b/drivers/misc/ocxl/Kconfig new file mode 100644 index 000000000..c9b0a27ca --- /dev/null +++ b/drivers/misc/ocxl/Kconfig @@ -0,0 +1,31 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Open Coherent Accelerator (OCXL) compatible devices +# + +config OCXL_BASE + bool + select PPC_COPRO_BASE + +config OCXL + tristate "OpenCAPI coherent accelerator support" + depends on HOTPLUG_PCI_POWERNV + select OCXL_BASE + default m + help + Select this option to enable the ocxl driver for Open + Coherent Accelerator Processor Interface (OpenCAPI) devices. + + OpenCAPI allows FPGA and ASIC accelerators to be coherently + attached to a CPU over an OpenCAPI link. + + The ocxl driver enables userspace programs to access these + accelerators through devices in /dev/ocxl/. + + For more information, see https://opencapi.org. + + This is not to be confused with the support for IBM CAPI + accelerators (CONFIG_CXL), which are PCI-based instead of a + dedicated OpenCAPI link, and don't follow the same protocol. + + If unsure, say N. -- cgit v1.3.1