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 --- tools/perf/ui/ui.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 tools/perf/ui/ui.h (limited to 'tools/perf/ui/ui.h') diff --git a/tools/perf/ui/ui.h b/tools/perf/ui/ui.h new file mode 100644 index 000000000..d8e911205 --- /dev/null +++ b/tools/perf/ui/ui.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _PERF_UI_H_ +#define _PERF_UI_H_ 1 + +#include "../util/mutex.h" +#include +#include + +extern struct mutex ui__lock; +extern void *perf_gtk_handle; + +extern int use_browser; + +void setup_browser(bool fallback_to_pager); +void exit_browser(bool wait_for_ok); + +#ifdef HAVE_SLANG_SUPPORT +int ui__init(void); +void ui__exit(bool wait_for_ok); +#else +static inline int ui__init(void) +{ + return -1; +} +static inline void ui__exit(bool wait_for_ok __maybe_unused) {} +#endif + +void ui__refresh_dimensions(bool force); + +struct option; + +int stdio__config_color(const struct option *opt, const char *mode, int unset); + +void pthread__block_sigwinch(void); +void pthread__unblock_sigwinch(void); + +#endif /* _PERF_UI_H_ */ -- cgit v1.3.1