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, 46 insertions, 0 deletions

diff --git a/drivers/accessibility/speakup/DefaultKeyAssignments b/drivers/accessibility/speakup/DefaultKeyAssignments
new file mode 100644
index 000000000..101c803b2
--- /dev/null
+++ b/drivers/accessibility/speakup/DefaultKeyAssignments
@@ -0,0 +1,46 @@
+This file is intended to give you an overview of the default keys used
+by speakup for it's review functions.  You may change them to be
+anything you want but that will take some familiarity with key
+mapping.
+
+We have remapped the insert or zero key on the keypad to act as a
+shift key.  Well, actually as an altgr key.  So in the following list
+InsKeyPad-period means hold down the insert key like a shift key and
+hit the keypad period.
+
+KeyPad-8		Say current Line
+InsKeyPad-8		say from top of screen to reading cursor.
+KeyPad-7		Say Previous Line (UP one line)
+KeyPad-9		Say Next Line (down one line)
+KeyPad-5		Say Current Word
+InsKeyPad-5		Spell Current Word
+KeyPad-4		Say Previous Word (left one word)
+InsKeyPad-4		say from left edge of line to reading cursor.
+KeyPad-6		Say Next Word (right one word)
+InsKeyPad-6		Say from reading cursor to right edge of line.
+KeyPad-2		Say Current Letter
+InsKeyPad-2		say current letter phonetically
+KeyPad-1		Say Previous Character (left one letter)
+KeyPad-3		Say Next Character (right one letter)
+KeyPad-plus		Say Entire Screen
+InsKeyPad-plus		Say from reading cursor line to bottom of screen.
+KeyPad-Minus		Park reading cursor (toggle)
+InsKeyPad-minus		Say character hex and decimal value.
+KeyPad-period		Say Position (current line, position and console)
+InsKeyPad-period	say colour attributes of current position.
+InsKeyPad-9		Move reading cursor to top of screen (insert pgup)
+InsKeyPad-3		Move reading cursor to bottom of screen (insert pgdn)
+InsKeyPad-7		Move reading cursor to left edge of screen (insert home)
+InsKeyPad-1		Move reading cursor to right edge of screen (insert end)
+ControlKeyPad-1		Move reading cursor to last character on current line.
+KeyPad-Enter		Shut Up (until another key is hit) and sync reading cursor
+InsKeyPad-Enter		Shut Up (until toggled back on).
+InsKeyPad-star n<x|y>	go to line (y) or column (x). Where 'n' is any
+		allowed value for the row or column for your current screen.
+KeyPad-/		Mark and Cut screen region.
+InsKeyPad-/		Paste screen region into any console.
+
+Hitting any key while speakup is outputting speech will quiet the
+synth until it has caught up with what is being printed on the
+console.
+