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-rw-r--r--arch/tile/lib/spinlock_64.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/tile/lib/spinlock_64.c b/arch/tile/lib/spinlock_64.c
index c8d1f94ff..a4b5b2cbc 100644
--- a/arch/tile/lib/spinlock_64.c
+++ b/arch/tile/lib/spinlock_64.c
@@ -76,6 +76,12 @@ void arch_spin_unlock_wait(arch_spinlock_t *lock)
do {
delay_backoff(iterations++);
} while (arch_spin_current(READ_ONCE(lock->lock)) == curr);
+
+ /*
+ * The TILE architecture doesn't do read speculation; therefore
+ * a control dependency guarantees a LOAD->{LOAD,STORE} order.
+ */
+ barrier();
}
EXPORT_SYMBOL(arch_spin_unlock_wait);