[PATCH AUTOSEL 5.15 34/69] refscale: Convert test_lock spinlock to raw_spinlock

[Sasha Levin]

From: Zqiang <qiang1.zhang@xxxxxxxxx>

[ Upstream commit 7bf336fb8dac718febb7bf4fe79e1be0c5e4a631 ]

In kernels built with CONFIG_PREEMPT_RT=y, spinlocks are replaced by
rt_mutex, which can sleep.  This means that acquiring a non-raw spinlock
in a critical section where preemption is disabled can trigger the
following BUG:

BUG: scheduling while atomic: ref_scale_reade/76/0x00000002
Preemption disabled at:
ref_lock_section+0x16/0x80
Call Trace:
<TASK>
dump_stack_lvl+0x5b/0x82
dump_stack+0x10/0x12
__schedule_bug.cold+0x9c/0xad
__schedule+0x839/0xc00
schedule_rtlock+0x22/0x40
rtlock_slowlock_locked+0x460/0x1350
rt_spin_lock+0x61/0xe0
ref_lock_section+0x29/0x80
rcu_scale_one_reader+0x52/0x60
ref_scale_reader+0x28d/0x490
kthread+0x128/0x150
ret_from_fork+0x22/0x30
</TASK>

This commit therefore converts spinlock to raw_spinlock.

Signed-off-by: Zqiang <qiang1.zhang@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 kernel/rcu/refscale.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index 66dc14cf5687..f72ddca5180f 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -363,7 +363,7 @@ static struct ref_scale_ops rwsem_ops = {
 };
 
 // Definitions for global spinlock
-static DEFINE_SPINLOCK(test_lock);
+static DEFINE_RAW_SPINLOCK(test_lock);
 
 static void ref_lock_section(const int nloops)
 {
@@ -371,8 +371,8 @@ static void ref_lock_section(const int nloops)
 
 	preempt_disable();
 	for (i = nloops; i >= 0; i--) {
-		spin_lock(&test_lock);
-		spin_unlock(&test_lock);
+		raw_spin_lock(&test_lock);
+		raw_spin_unlock(&test_lock);
 	}
 	preempt_enable();
 }
@@ -383,9 +383,9 @@ static void ref_lock_delay_section(const int nloops, const int udl, const int nd
 
 	preempt_disable();
 	for (i = nloops; i >= 0; i--) {
-		spin_lock(&test_lock);
+		raw_spin_lock(&test_lock);
 		un_delay(udl, ndl);
-		spin_unlock(&test_lock);
+		raw_spin_unlock(&test_lock);
 	}
 	preempt_enable();
 }
@@ -405,8 +405,8 @@ static void ref_lock_irq_section(const int nloops)
 
 	preempt_disable();
 	for (i = nloops; i >= 0; i--) {
-		spin_lock_irqsave(&test_lock, flags);
-		spin_unlock_irqrestore(&test_lock, flags);
+		raw_spin_lock_irqsave(&test_lock, flags);
+		raw_spin_unlock_irqrestore(&test_lock, flags);
 	}
 	preempt_enable();
 }
@@ -418,9 +418,9 @@ static void ref_lock_irq_delay_section(const int nloops, const int udl, const in
 
 	preempt_disable();
 	for (i = nloops; i >= 0; i--) {
-		spin_lock_irqsave(&test_lock, flags);
+		raw_spin_lock_irqsave(&test_lock, flags);
 		un_delay(udl, ndl);
-		spin_unlock_irqrestore(&test_lock, flags);
+		raw_spin_unlock_irqrestore(&test_lock, flags);
 	}
 	preempt_enable();
 }
-- 
2.35.1