[PATCH bpf-next v3 1/7] rcu: add rcu_read_lock_dont_migrate()

[Menglong Dong]

migrate_disable() is called to disable migration in the kernel, and it is
often used together with rcu_read_lock().

However, with PREEMPT_RCU disabled, it's unnecessary, as rcu_read_lock()
will always disable preemption, which will also disable migration.

Introduce rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate(),
which will do the migration enable and disable only when PREEMPT_RCU.

Signed-off-by: Menglong Dong <dongml2@xxxxxxxxxxxxxxx>
---
v3:
- make rcu_read_lock_dont_migrate() more compact

v2:
- introduce rcu_read_lock_dont_migrate() instead of rcu_migrate_disable()
---
 include/linux/rcupdate.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 120536f4c6eb..9691ca380a4f 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -962,6 +962,20 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
 	preempt_enable_notrace();
 }
 
+static __always_inline void rcu_read_lock_dont_migrate(void)
+{
+	if (IS_ENABLED(CONFIG_PREEMPT_RCU))
+		migrate_disable();
+	rcu_read_lock();
+}
+
+static inline void rcu_read_unlock_migrate(void)
+{
+	rcu_read_unlock();
+	if (IS_ENABLED(CONFIG_PREEMPT_RCU))
+		migrate_enable();
+}
+
 /**
  * RCU_INIT_POINTER() - initialize an RCU protected pointer
  * @p: The pointer to be initialized.
-- 
2.50.1