linux-kernel - [PATCH V2 02/11] rcu: Move rcu_preempt_depth

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Date: Sun,  7 Apr 2024 17:05:49 +0800
From: Lai Jiangshan <jiangshanlai@...il.com>
To: linux-kernel@...r.kernel.org
Cc: rcu@...r.kernel.org,
	x86@...nel.org,
	Lai Jiangshan <jiangshan.ljs@...group.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <quic_neeraju@...cinc.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>
Subject: [PATCH V2 02/11] rcu: Move rcu_preempt_depth_set() to rcupdate.h

From: Lai Jiangshan <jiangshan.ljs@...group.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@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@...group.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