On Thu, 5 Nov 2020, Steven Rostedt wrote: > From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx> > > If a ftrace callback does not supply its own recursion protection and > does not set the RECURSION_SAFE flag in its ftrace_ops, then ftrace will > make a helper trampoline to do so before calling the callback instead of > just calling the callback directly. > > The default for ftrace_ops is going to change. It will expect that handlers > provide their own recursion protection, unless its ftrace_ops states > otherwise. > > Link: https://lkml.kernel.org/r/20201028115613.291169246@xxxxxxxxxxx > > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > Cc: Jiri Kosina <jikos@xxxxxxxxxx> > Cc: Miroslav Benes <mbenes@xxxxxxx> > Cc: Joe Lawrence <joe.lawrence@xxxxxxxxxx> > Cc: live-patching@xxxxxxxxxxxxxxx > Reviewed-by: Petr Mladek <pmladek@xxxxxxxx> > Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx> Acked-by: Miroslav Benes <mbenes@xxxxxxx> M
