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/pmdomain/qcom/Kconfig | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 drivers/pmdomain/qcom/Kconfig (limited to 'drivers/pmdomain/qcom/Kconfig') diff --git a/drivers/pmdomain/qcom/Kconfig b/drivers/pmdomain/qcom/Kconfig new file mode 100644 index 000000000..4abd43a88 --- /dev/null +++ b/drivers/pmdomain/qcom/Kconfig @@ -0,0 +1,41 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "Qualcomm PM Domains" + +config QCOM_CPR + tristate "Qualcomm Core Power Reduction (CPR) support" + depends on (ARCH_QCOM || COMPILE_TEST) && HAS_IOMEM + select PM_OPP + select REGMAP + help + Say Y here to enable support for the CPR hardware found on Qualcomm + SoCs like QCS404. + + This driver populates CPU OPPs tables and makes adjustments to the + tables based on feedback from the CPR hardware. If you want to do + CPUfrequency scaling say Y here. + + To compile this driver as a module, choose M here: the module will + be called qcom-cpr + +config QCOM_RPMHPD + tristate "Qualcomm RPMh Power domain driver" + depends on QCOM_RPMH && QCOM_COMMAND_DB + help + QCOM RPMh Power domain driver to support power-domains with + performance states. The driver communicates a performance state + value to RPMh which then translates it into corresponding voltage + for the voltage rail. + +config QCOM_RPMPD + tristate "Qualcomm RPM Power domain driver" + depends on PM && OF + depends on QCOM_SMD_RPM + select PM_GENERIC_DOMAINS + select PM_GENERIC_DOMAINS_OF + help + QCOM RPM Power domain driver to support power-domains with + performance states. The driver communicates a performance state + value to RPM which then translates it into corresponding voltage + for the voltage rail. + +endmenu -- cgit v1.3.1