In the next commit, we will move the definition of migrate_enable() and
migrate_disable() to linux/sched.h. However,
migrate_enable/migrate_disable will be used in commit
1b93c03fb3 ("rcu: add rcu_read_lock_dont_migrate()") in bpf-next tree.
In order to fix potential compiling error, replace linux/preempt.h with
linux/sched.h in include/linux/rcupdate.h.
Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
88a90315a9