x86: move dma_sync_single_for_cpu to common header

i386 gets an empty function.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 6e7747a23e5b..507069d231dd 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -91,4 +91,16 @@ dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
         if (dma_ops->unmap_sg)
                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 }
+
+static inline void
+dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
+                        size_t size, int direction)
+{
+        BUG_ON(!valid_dma_direction(direction));
+        if (dma_ops->sync_single_for_cpu)
+                dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
+                                             direction);
+        flush_write_buffers();
+}
+
 #endif