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Index: sys/sys/buf_ring.h
===================================================================
--- sys/sys/buf_ring.h
+++ sys/sys/buf_ring.h
@@ -162,8 +162,8 @@
uint32_t prod_tail;
void *buf;
- cons_head = br->br_cons_head;
- prod_tail = br->br_prod_tail;
+ cons_head = atomic_load_acq_32(&br->br_cons_head);
+ prod_tail = atomic_load_acq_32(&br->br_prod_tail);
cons_next = (cons_head + 1) & br->br_cons_mask;
#ifdef PREFETCH_DEFINED

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