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/ntb/test/Kconfig | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 drivers/ntb/test/Kconfig (limited to 'drivers/ntb/test/Kconfig') diff --git a/drivers/ntb/test/Kconfig b/drivers/ntb/test/Kconfig new file mode 100644 index 000000000..516b991f3 --- /dev/null +++ b/drivers/ntb/test/Kconfig @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: GPL-2.0-only +config NTB_PINGPONG + tristate "NTB Ping Pong Test Client" + help + This is a simple ping pong driver that exercises the scratchpads and + doorbells of the ntb hardware. This driver may be used to test that + your ntb hardware and drivers are functioning at a basic level. + + If unsure, say N. + +config NTB_TOOL + tristate "NTB Debugging Tool Test Client" + help + This is a simple debugging driver that enables the doorbell and + scratchpad registers to be read and written from the debugfs. This + enables more complicated debugging to be scripted from user space. + This driver may be used to test that your ntb hardware and drivers are + functioning at a basic level. + + If unsure, say N. + +config NTB_PERF + tristate "NTB RAW Perf Measuring Tool" + help + This is a tool to measure raw NTB performance by transferring data + to and from the window without additional software interaction. + + If unsure, say N. + +config NTB_MSI_TEST + tristate "NTB MSI Test Client" + depends on NTB_MSI + help + This tool demonstrates the use of the NTB MSI library to + send MSI interrupts between peers. + + If unsure, say N. -- cgit v1.3.1