mm/dmapool.c: revert "make dma pool to use kmalloc_node"

This reverts commit 2618c60 ("dma: make dma pool to use
kmalloc_node").

While working myself into the dmapool code I've found this little odd
kmalloc_node().

What basically happens here is that we allocate the housekeeping
structure on the numa node where the device is attached to.  Since the
device is never doing DMA to or from that memory this doesn't seem to
make sense at all.

So while this doesn't seem to cause much harm it's probably cleaner to
revert the change for consistency.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Christian König <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: ChristianKoenigAMD

mm/dmapool.c

@@ -152,7 +152,7 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev,
 	else if ((boundary < size) || (boundary & (boundary - 1)))
 		return NULL;
 
-	retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, dev_to_node(dev));
+	retval = kmalloc(sizeof(*retval), GFP_KERNEL);
 	if (!retval)
 		return retval;