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x86/qspinlock, kcsan: Instrument barrier of pv_queued_spin_unlock()

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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@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver 2021-11-30 12:44:27 +01:00 committed by Paul E. McKenney
parent cd8730c3ab
commit d93414e375
1 changed files with 1 additions and 0 deletions
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arch/x86/include/asm/qspinlock.h
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@ -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);
}