This is used by the qtnfmac driver.
This was added in commit 1077fa36f23e259 ("arch: Add lightweight memory
barriers dma_rmb() and dma_wmb()")
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/asm/barrier.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/backport/backport-include/asm/barrier.h b/backport/backport-include/asm/barrier.h
index 9147fb05..9e1e1f11 100644
--- a/backport/backport-include/asm/barrier.h
+++ b/backport/backport-include/asm/barrier.h
@@ -11,6 +11,10 @@
#define dma_rmb() rmb()
#endif
+#ifndef dma_wmb
+#define dma_wmb() wmb()
+#endif
+
#ifndef smp_mb__after_atomic
#define smp_mb__after_atomic smp_mb__after_clear_bit
#endif
--
2.11.0
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