linux-kernel - [PATCH 1/2] dma-coherent: remove the DMA_MEMORY_INCLUDES

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Date:   Sat, 26 Aug 2017 09:26:49 +0200
From:   Christoph Hellwig <hch@....de>
To:     linux-kernel@...r.kernel.org
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>
Subject: [PATCH 1/2] dma-coherent: remove the DMA_MEMORY_INCLUDES_CHILDREN flag

This flag was never implemented or used.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Robin Murphy <robin.murphy@....com>
---
 Documentation/DMA-API.txt     | 4 ----
 drivers/base/dma-coherent.c   | 2 --
 drivers/char/virtio_console.c | 3 ---
 include/linux/dma-mapping.h   | 3 +--
 4 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index 45b29326d719..ded50aed1cd8 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -598,10 +598,6 @@ flags can be ORed together and are:
 
 One or both of these flags must be present.
 
-- DMA_MEMORY_INCLUDES_CHILDREN - make the declared memory be allocated by
-  dma_alloc_coherent of any child devices of this one (for memory residing
-  on a bridge).
-
 - DMA_MEMORY_EXCLUSIVE - only allocate memory from the declared regions.
   Do not allow dma_alloc_coherent() to fall back to system memory when
   it's out of memory in the declared region.
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index 1c152aed6b82..6f6dc4d41788 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -109,8 +109,6 @@ static int dma_assign_coherent_memory(struct device *dev,
 		return -EBUSY;
 
 	dev->dma_mem = mem;
-	/* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
-
 	return 0;
 }
 
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index ad843eb02ae7..48e86ce9fac8 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -451,9 +451,6 @@ static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size,
 		 * device is created by remoteproc, the DMA memory is
 		 * associated with the grandparent device:
 		 * vdev => rproc => platform-dev.
-		 * The code here would have been less quirky if
-		 * DMA_MEMORY_INCLUDES_CHILDREN had been supported
-		 * in dma-coherent.c
 		 */
 		if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent)
 			goto free_buf;
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 66d8ea68f40b..9b12cb255063 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -710,8 +710,7 @@ static inline int dma_get_cache_alignment(void)
 /* flags for the coherent memory api */
 #define	DMA_MEMORY_MAP			0x01
 #define DMA_MEMORY_IO			0x02
-#define DMA_MEMORY_INCLUDES_CHILDREN	0x04
-#define DMA_MEMORY_EXCLUSIVE		0x08
+#define DMA_MEMORY_EXCLUSIVE		0x04
 
 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
 int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
-- 
2.11.0