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/acpi/sleep.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 drivers/acpi/sleep.h (limited to 'drivers/acpi/sleep.h') diff --git a/drivers/acpi/sleep.h b/drivers/acpi/sleep.h new file mode 100644 index 000000000..9c3cb109c --- /dev/null +++ b/drivers/acpi/sleep.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +extern void acpi_enable_wakeup_devices(u8 sleep_state); +extern void acpi_disable_wakeup_devices(u8 sleep_state); +extern bool acpi_check_wakeup_handlers(void); + +extern struct list_head acpi_wakeup_device_list; +extern struct mutex acpi_device_lock; + +extern void acpi_resume_power_resources(void); + +static inline acpi_status acpi_set_waking_vector(u32 wakeup_address) +{ + return acpi_set_firmware_waking_vector( + (acpi_physical_address)wakeup_address, 0); +} + +extern int acpi_s2idle_begin(void); +extern int acpi_s2idle_prepare(void); +extern bool acpi_s2idle_wake(void); +extern void acpi_s2idle_restore(void); +extern void acpi_s2idle_end(void); + +extern void acpi_s2idle_setup(void); + +#ifdef CONFIG_ACPI_SLEEP +extern bool acpi_sleep_default_s3; +#else +#define acpi_sleep_default_s3 (1) +#endif -- cgit v1.3.1