ftrace: Synchronize the initialization of ftrace_opsgrafted

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 <rostedt@goodmis.org>

1 files changed, 86 insertions, 0 deletions

diff --git a/tools/power/pm-graph/Makefile b/tools/power/pm-graph/Makefile
new file mode 100644
index 000000000..aeddbaf2d
--- /dev/null
+++ b/tools/power/pm-graph/Makefile
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) 2013, Intel Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# Authors:
+#	 Todd Brandt <todd.e.brandt@linux.intel.com>
+
+# Prefix to the directories we're installing to
+DESTDIR ?=
+
+# Directory definitions. These are default and most probably
+# do not need to be changed. Please note that DESTDIR is
+# added in front of any of them
+
+BINDIR ?=	/usr/bin
+MANDIR ?=	/usr/share/man
+LIBDIR ?=	/usr/lib
+
+# Toolchain: what tools do we use, and what options do they need:
+INSTALL = /usr/bin/install
+INSTALL_DATA  = ${INSTALL} -m 644
+
+all:
+	@echo "Nothing to build"
+
+install : uninstall
+	$(INSTALL) -d  $(DESTDIR)$(LIBDIR)/pm-graph
+	$(INSTALL) sleepgraph.py $(DESTDIR)$(LIBDIR)/pm-graph
+	$(INSTALL) bootgraph.py $(DESTDIR)$(LIBDIR)/pm-graph
+	$(INSTALL) -d  $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/cgskip.txt $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/freeze-callgraph.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/freeze.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/freeze-dev.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/standby-callgraph.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/standby.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/standby-dev.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/suspend-callgraph.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/suspend.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/suspend-dev.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+	$(INSTALL_DATA) config/suspend-x2-proc.cfg $(DESTDIR)$(LIBDIR)/pm-graph/config
+
+	$(INSTALL) -d  $(DESTDIR)$(BINDIR)
+	ln -s ../lib/pm-graph/bootgraph.py $(DESTDIR)$(BINDIR)/bootgraph
+	ln -s ../lib/pm-graph/sleepgraph.py $(DESTDIR)$(BINDIR)/sleepgraph
+
+	$(INSTALL) -d  $(DESTDIR)$(MANDIR)/man8
+	$(INSTALL) bootgraph.8 $(DESTDIR)$(MANDIR)/man8
+	$(INSTALL) sleepgraph.8 $(DESTDIR)$(MANDIR)/man8
+
+uninstall :
+	rm -f $(DESTDIR)$(MANDIR)/man8/bootgraph.8
+	rm -f $(DESTDIR)$(MANDIR)/man8/sleepgraph.8
+
+	rm -f $(DESTDIR)$(BINDIR)/bootgraph
+	rm -f $(DESTDIR)$(BINDIR)/sleepgraph
+
+	rm -f $(DESTDIR)$(LIBDIR)/pm-graph/config/*
+	if [ -d $(DESTDIR)$(LIBDIR)/pm-graph/config ] ; then \
+		rmdir $(DESTDIR)$(LIBDIR)/pm-graph/config; \
+	fi;
+	rm -f $(DESTDIR)$(LIBDIR)/pm-graph/__pycache__/*
+	if [ -d $(DESTDIR)$(LIBDIR)/pm-graph/__pycache__ ] ; then \
+		rmdir $(DESTDIR)$(LIBDIR)/pm-graph/__pycache__; \
+	fi;
+	rm -f $(DESTDIR)$(LIBDIR)/pm-graph/*
+	if [ -d $(DESTDIR)$(LIBDIR)/pm-graph ] ; then \
+		rmdir $(DESTDIR)$(LIBDIR)/pm-graph; \
+	fi;
+
+help:
+	@echo  'Building targets:'
+	@echo  '  all		  - Nothing to build'
+	@echo  '  install	  - Install the program and create necessary directories'
+	@echo  '  uninstall	  - Remove installed files and directories'
+
+.PHONY: all install uninstall help