Kim reported that perf-ftrace made his box unhappy. It turns out that
commit:
ff5c4f5cad ("rcu/tree: Mark the idle relevant functions noinstr")
removed one too many notrace qualifiers, probably due to there not being
a helpful comment.
This commit therefore reinstates the notrace and adds a comment to avoid
losing it again.
[ paulmck: Apply Steven Rostedt's feedback on the comment. ]
Fixes: ff5c4f5cad ("rcu/tree: Mark the idle relevant functions noinstr")
Reported-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
d2098b4440