From: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Prepare for arch-specific-defined rcu_preempt_depth_set().
No functionality change intended, but it has to be defined as a macro
as rcupdate.h is a very low level header included from areas that don't
even know about the task struct "current".
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
---
include/linux/rcupdate.h | 1 +
kernel/rcu/tree_plugin.h | 5 -----
2 files changed, 1 insertion(+), 5 deletions(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 17d7ed5f3ae6..ebe9bfc700bb 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -78,6 +78,7 @@ void __rcu_read_unlock(void);
* types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
*/
#define rcu_preempt_depth() READ_ONCE(current->rcu_read_lock_nesting)
+#define rcu_preempt_depth_set(val) WRITE_ONCE(current->rcu_read_lock_nesting, (val))
#else /* #ifdef CONFIG_PREEMPT_RCU */
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 36a8b5dbf5b5..b1264096d03a 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -387,11 +387,6 @@ static int rcu_preempt_read_exit(void)
return ret;
}
-static void rcu_preempt_depth_set(int val)
-{
- WRITE_ONCE(current->rcu_read_lock_nesting, val);
-}
-
/*
* Preemptible RCU implementation for rcu_read_lock().
* Just increment ->rcu_read_lock_nesting, shared state will be updated
--
2.19.1.6.gb485710b