DMA-API: Capitalize "CPU" consistently

Sometimes we used "cpu," other times "CPU."  Use "CPU" consistently.

Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt
index fd3727b..f599553 100644
--- a/Documentation/DMA-API-HOWTO.txt
+++ b/Documentation/DMA-API-HOWTO.txt
@@ -575,10 +575,10 @@
 You should call dma_unmap_single() when the DMA activity is finished, e.g.,
 from the interrupt which told you that the DMA transfer is done.
 
-Using cpu pointers like this for single mappings has a disadvantage:
+Using CPU pointers like this for single mappings has a disadvantage:
 you cannot reference HIGHMEM memory in this way.  Thus, there is a
 map/unmap interface pair akin to dma_{map,unmap}_single().  These
-interfaces deal with page/offset pairs instead of cpu pointers.
+interfaces deal with page/offset pairs instead of CPU pointers.
 Specifically:
 
 	struct device *dev = &my_dev->dev;
@@ -650,7 +650,7 @@
 
 If you need to use the same streaming DMA region multiple times and touch
 the data in between the DMA transfers, the buffer needs to be synced
-properly in order for the cpu and device to see the most up-to-date and
+properly in order for the CPU and device to see the most up-to-date and
 correct copy of the DMA buffer.
 
 So, firstly, just map it with dma_map_{single,sg}(), and after each DMA
@@ -665,7 +665,7 @@
 as appropriate.
 
 Then, if you wish to let the device get at the DMA area again,
-finish accessing the data with the cpu, and then before actually
+finish accessing the data with the CPU, and then before actually
 giving the buffer to the hardware call either:
 
 	dma_sync_single_for_device(dev, dma_handle, size, direction);