kprobes: Fix to delay the kprobes jump optimization

Commit 36dadef23fcc ("kprobes: Init kprobes in early_initcall")
moved the kprobe setup in early_initcall(), which includes kprobe
jump optimization.
The kprobes jump optimizer involves synchronize_rcu_tasks() which
depends on the ksoftirqd and rcu_spawn_tasks_*(). However, since
those are setup in core_initcall(), kprobes jump optimizer can not
run at the early_initcall().

To avoid this issue, make the kprobe optimization disabled in the
early_initcall() and enables it in subsys_initcall().

Note that non-optimized kprobes is still available after
early_initcall(). Only jump optimization is delayed.

Link: https://lkml.kernel.org/r/161365856280.719838.12423085451287256713.stgit@devnote2

Fixes: 36dadef23fcc ("kprobes: Init kprobes in early_initcall")
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: RCU <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Daniel Axtens <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Neeraj Upadhyay <[email protected]>
Cc: Joel Fernandes <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: "Theodore Y . Ts'o" <[email protected]>
Cc: Oleksiy Avramchenko <[email protected]>
Cc: [email protected]
Reported-by: Paul E. McKenney <[email protected]>
Reported-by: Sebastian Andrzej Siewior <[email protected]>
Reported-by: Uladzislau Rezki <[email protected]>
Acked-by: Paul E. McKenney <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

0 files changed, 0 insertions, 0 deletions