linux-kernel - [PATCH 4/7] dma-mapping: Always provide dma_default

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Message-Id: <20230221124613.2859-5-jiaxun.yang@flygoat.com>
Date:   Tue, 21 Feb 2023 12:46:10 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        tsbogend@...ha.franken.de, mpe@...erman.id.au,
        paul.walmsley@...ive.com, palmer@...belt.com, robh+dt@...nel.org,
        hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH 4/7] dma-mapping: Always provide dma_default_coherent

dma_default_coherent can be useful for determine default coherency
even on arches without noncoherent support.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 include/linux/dma-map-ops.h | 1 +
 kernel/dma/mapping.c        | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h
index d678afeb8a13..3c6cd17f87c3 100644
--- a/include/linux/dma-map-ops.h
+++ b/include/linux/dma-map-ops.h
@@ -269,6 +269,7 @@ static inline bool dev_is_dma_coherent(struct device *dev)
 	return dev->dma_coherent;
 }
 #else
+#define dma_default_coherent true
 static inline bool dev_is_dma_coherent(struct device *dev)
 {
 	return true;
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index c026a5a5e046..e0b005c8ffce 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -17,7 +17,11 @@
 #include "debug.h"
 #include "direct.h"
 
+#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
+	defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
+	defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
 bool dma_default_coherent;
+#endif
 
 /*
  * Managed DMA API
-- 
2.37.1 (Apple Git-137.1)