linux-kernel - [PATCH v2 02/10] rcu: Make some rcu_watching

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Message-Id: <20241009125127.18902-3-neeraj.upadhyay@kernel.org>
Date: Wed,  9 Oct 2024 18:21:19 +0530
From: neeraj.upadhyay@...nel.org
To: rcu@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	paulmck@...nel.org,
	joel@...lfernandes.org,
	frederic@...nel.org,
	boqun.feng@...il.com,
	urezki@...il.com,
	rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com,
	jiangshanlai@...il.com,
	qiang.zhang1211@...il.com,
	peterz@...radead.org,
	neeraj.upadhyay@....com,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
Subject: [PATCH v2 02/10] rcu: Make some rcu_watching_* functions global

From: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>

rcu_watching_snap_in_eqs() and rcu_watching_snap_stopped_since()
will be used in subsequent commits by RCU-tasks to check rcu_watching
state of idle tasks. So, make these functions global.

Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
---
 kernel/rcu/rcu.h  | 4 ++++
 kernel/rcu/tree.c | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index feb3ac1dc5d5..5fec1b52039c 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -609,6 +609,8 @@ void srcutorture_get_gp_data(struct srcu_struct *sp, int *flags,
 
 #ifdef CONFIG_TINY_RCU
 static inline bool rcu_watching_zero_in_eqs(int cpu, int *vp) { return false; }
+static inline bool rcu_watching_snap_in_eqs(int snap) { return false; }
+static inline bool rcu_watching_snap_stopped_since(int cpu, int snap) { return false; }
 static inline unsigned long rcu_get_gp_seq(void) { return 0; }
 static inline unsigned long rcu_exp_batches_completed(void) { return 0; }
 static inline unsigned long
@@ -622,6 +624,8 @@ static inline void rcu_gp_slow_register(atomic_t *rgssp) { }
 static inline void rcu_gp_slow_unregister(atomic_t *rgssp) { }
 #else /* #ifdef CONFIG_TINY_RCU */
 bool rcu_watching_zero_in_eqs(int cpu, int *vp);
+bool rcu_watching_snap_in_eqs(int snap);
+bool rcu_watching_snap_stopped_since(int cpu, int snap);
 unsigned long rcu_get_gp_seq(void);
 unsigned long rcu_exp_batches_completed(void);
 unsigned long srcu_batches_completed(struct srcu_struct *sp);
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index ea17dd2d0344..5ecbf85f157d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -303,7 +303,7 @@ static void rcu_watching_online(void)
  * Return true if the snapshot returned from ct_rcu_watching()
  * indicates that RCU is in an extended quiescent state.
  */
-static bool rcu_watching_snap_in_eqs(int snap)
+bool rcu_watching_snap_in_eqs(int snap)
 {
 	return !(snap & CT_RCU_WATCHING);
 }
@@ -321,7 +321,7 @@ static bool rcu_watching_snap_in_eqs(int snap)
  *
  * This is meant to be used in a loop waiting for a CPU to go through an EQS.
  */
-static bool rcu_watching_snap_stopped_since(int cpu, int snap)
+bool rcu_watching_snap_stopped_since(int cpu, int snap)
 {
 	/*
 	 * The first failing snapshot is already ordered against the accesses
-- 
2.40.1