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/clk/versatile/Kconfig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/clk/versatile/Kconfig (limited to 'drivers/clk/versatile/Kconfig') diff --git a/drivers/clk/versatile/Kconfig b/drivers/clk/versatile/Kconfig new file mode 100644 index 000000000..403f16495 --- /dev/null +++ b/drivers/clk/versatile/Kconfig @@ -0,0 +1,32 @@ +# SPDX-License-Identifier: GPL-2.0-only + +menu "Clock driver for ARM Reference designs" + depends on HAS_IOMEM + depends on ARM || ARM64 || COMPILE_TEST + +config CLK_ICST + bool "Clock driver for ARM Reference designs ICST" + select REGMAP_MMIO + help + Supports clocking on ARM Reference designs: + - Integrator/AP and Integrator/CP + - RealView PB1176, EB, PB11MP and PBX + +config CLK_SP810 + bool "Clock driver for ARM SP810 System Controller" + default y if (ARCH_VEXPRESS && ARM) + help + Supports clock muxing (REFCLK/TIMCLK to TIMERCLKEN0-3) capabilities + of the ARM SP810 System Controller cell. + +config CLK_VEXPRESS_OSC + tristate "Clock driver for Versatile Express OSC clock generators" + depends on VEXPRESS_CONFIG + select REGMAP_MMIO + default y if ARCH_VEXPRESS + help + Simple regmap-based driver driving clock generators on Versatile + Express platforms hidden behind its configuration infrastructure, + commonly known as OSCs. + +endmenu -- cgit v1.3.1