[PATCH kcsan 19/29] x86/qspinlock, kcsan: Instrument barrier of pv_queued_spin_unlock()

[Paul E. McKenney]

From: Marco Elver <elver@xxxxxxxxxx>

If CONFIG_PARAVIRT_SPINLOCKS=y, queued_spin_unlock() is implemented
using pv_queued_spin_unlock() which is entirely inline asm based. As
such, we do not receive any KCSAN barrier instrumentation via regular
atomic operations.

Add the missing KCSAN barrier instrumentation for the
CONFIG_PARAVIRT_SPINLOCKS case.

Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
 arch/x86/include/asm/qspinlock.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h
index d86ab942219c4..d87451df480bd 100644
--- a/arch/x86/include/asm/qspinlock.h
+++ b/arch/x86/include/asm/qspinlock.h
@@ -53,6 +53,7 @@ static inline void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
 
 static inline void queued_spin_unlock(struct qspinlock *lock)
 {
+	kcsan_release();
 	pv_queued_spin_unlock(lock);
 }
 
-- 
2.31.1.189.g2e36527f23