ftrace: Mark get_lock_parent_ip() __always_inline

commit ea65b418 upstream.

If the compiler decides not to inline this function then preemption
tracing will always show an IP inside the preemption disabling path and
never the function actually calling preempt_{enable,disable}.

Link: https://lore.kernel.org/linux-trace-kernel/20230327173647.1690849-1-john@metanate.com



Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: stable@vger.kernel.org
Fixes: f904f582 ("sched/debug: Fix preempt_disable_ip recording for preempt_disable()")
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>